Pump for chemical solution and delivery device for chemical solution.

专利摘要:
The present invention relates to a pump (2) for a chemical solution comprising a holding member which holds a syringe (10) discharging a chemical solution in association with the movement of a piston (12), a drive unit (22) which presses the plunger (12) with a predetermined driving force to move the plunger (12) in a first direction towards the interior of the syringe (10), and an adjustment mechanism (23) which adjusts the movement of the plunger (12) so that the piston (12) moves with the driving force. The adjustment mechanism (23) applies an auxiliary force to the piston (12) in a direction identical to the first direction, or applies a reaction force to the piston (12) in a second direction opposite to the first direction, according to the difference between a resistance force generated by the movement of the plunger (12) inside the syringe (10) and the driving force. The invention also relates to a device (1) for administering a chemical solution comprising such a pump (2).
公开号:CH717133A2
申请号:CH00078/21
申请日:2021-01-28
公开日:2021-08-16
发明作者:Nagata Tetsuya；Sato Akehiko；Endo Yoichi
申请人:Seiko Instr Inc；
IPC主号:

专利说明:

Technical area
The present invention relates to a pump for chemical solution and a chemical solution administration device.
Priority is claimed from Japanese Patent Application No. 2020-015399, filed January 31, 2020, the contents of which are incorporated herein by reference.
State of the art
In the state of the art, pumps for chemical solutions which administer a chemical solution have been used in various fields. For example, a pump for chemical solution is used when the chemical solution is injected into physical and chemical fields and in the medical field, when a chemical solution such as acid and alkali is injected into the treatment field of water, or when a chemical solution such as a nutritional supplement is injected into the field of animal husbandry.
As such a chemical solution pump, for example, as described in PTL 1, a chemical solution pump is known which discharges a chemical solution such as insulin and delivers the chemical solution into the body of the fluid. an user.
The pump for chemical solution comprises a holding body which contains a syringe filled with the chemical solution, a pressure element provided in the support body to be movable and pressing a piston of the syringe, a spiral spring which urges the pressure element with the piston, and locking means for restricting the movement of the pressure element.
According to the pump for chemical solution configured in this way, when the restriction of movement of the pressure element by the locking means is released, the spiral spring deforms elastically to wind the part connected to the element of pressure due to the spiral spring's own elastic return force. In this way, the pressure element can be moved to depress the piston. As a result, the chemical solution can be discharged from inside the syringe with a constant discharge amount (discharge rate), and can be delivered to the user's body.
List of citations
Patent literature
[0007] [PTL 1] Japanese Unexamined Patent Application, First Publication No. 2011-250867.
Summary of the invention
Technical problem
In the prior art chemical solution pump described above, the discharge amount of the chemical solution is kept constant by using the energy of the hairspring to squeeze the pressure member.
[0009] However, when the plunger is moved inside the syringe, the plunger actually receives a resistance force, as the plunger is affected by the sliding resistance of a sealing member such as a gasket. O-ring or seal disposed inside the syringe, or by the viscosity of the chemical solution. In addition, the resistance force is not always constant and can be changed smoothly during the movement of the piston in some cases. Therefore, it is difficult to press the piston with a predetermined driving force (push), and the amount of movement of the piston per unit time tends to fluctuate. Therefore, in the prior art chemical solution pump described above, it is difficult to keep the discharge amount of the chemical solution constant, and moreover, there is a problem that the precision discharge is degraded.
The present invention is made in view of the circumstances described above, and an object thereof is to provide a pump for chemical solution and a chemical solution delivery device which are capable of accurately discharging a solution. chemical with a constant amount of discharge.
Solution to the problem
[0011] (1) According to a first aspect of the present invention, there is provided a pump for chemical solution comprising a holding member which contains a syringe filled with a chemical solution and discharging the chemical solution in association with a movement of a plunger arranged to be movable within the syringe, a drive unit which presses the plunger with a predetermined drive force to move the plunger in a first direction towards the interior of the syringe, and a mechanism for An adjustment that adjusts the movement of the piston so that the piston moves with the driving force. The adjustment mechanism applies an auxiliary force to the piston in a direction identical to the first direction, or applies a reaction force to the piston in a second direction opposite to the first direction, according to the difference between a resistance force generated by the movement of the plunger inside the syringe and the driving force.
[0012] In this case, the piston is pressed using the driving force of the driving unit. Therefore, the plunger can be moved to be pushed into the syringe, and the chemical solution inside the syringe can be discharged to the outside. In particular, when the plunger is pressed using the driving force, the adjustment mechanism applies the auxiliary force to the plunger in the first direction towards the interior of the syringe, or applies the reaction force to the plunger in the second. direction opposite to the first direction, based on the difference between the resistance force generated by the movement of the plunger inside the syringe and the driving force.
[0013] For example, when the resistance force (for example, the sliding resistance generated between the syringe and the plunger or the viscous resistance of the chemical solution) generated by the movement of the plunger is large, the displacement speed of the plunger becomes slower, and the amount of movement per unit time of the piston decreases. In this case, the adjustment mechanism increases the speed of the plunger by applying the auxiliary force (i.e. positive thrust) to the plunger in the first direction towards the interior of the syringe. On the other hand, when the resistance force is small, the displacement speed of the piston becomes faster and the amount of movement per unit time of the piston increases. In this case, the adjustment mechanism can prevent the displacement speed of the piston from becoming faster by applying the reaction force (i.e. negative thrust) to the piston in the second direction opposite to the first direction. .
[0014] In this way, the adjustment mechanism applies the auxiliary force or the reaction force to the piston, depending on the difference between the resistance force generated by the movement of the piston inside the syringe and the force training. Therefore, the moving speed can be corrected to compensate for the influence of the resistance force. Therefore, the piston can be moved by the driving force applied from the driving unit. Therefore, it is possible to feed and move (advance) the piston with a constant amount of movement, and the chemical solution can be discharged precisely with a constant discharge amount (constant amount). Therefore, it is possible to provide the chemical solution pump having excellent discharge precision. The chemical solution pump includes the drive unit. As a result, for example, even when the auxiliary force itself applied by the adjustment mechanism is weaker than the resistance force, it is possible to advance and move (advance) the piston with an amount of constant movement.
[0015] (2) The adjustment mechanism may include a movable body arranged to be movable along an axis in connection with the piston, a feed mechanism which moves the movable body in the first direction at a predetermined speed , and applies the auxiliary force to the piston via the movable body, and a braking unit which applies the reaction force to the piston in the second direction via the movable body.
In this case, the adjustment mechanism comprises the advance mechanism and the braking unit. As a result, it is possible to properly apply the auxiliary force or the reaction force to the piston according to the difference between the resistance force and the driving force. The piston can be reliably moved by the driving force applied from the driving unit.
[0017] (3) The movable body may have a feed screw having a male screw portion formed on an outer peripheral surface, and disposed in a state where the rotation about the axis is restricted. The feed mechanism may include a nut member which has a female screw part screwed onto the male screw part, and which is screwed onto the feed screw, a drive source which generates power for rotating the nut member, a cog mechanism which transmits energy from the drive source to the nut member, and a speed control mechanism which controls the speed of the cog mechanism. The braking unit may use at least an engaging force in the cog mechanism and an engaging force of the male screw part with respect to the female screw part, as a reaction force.
In this case, the cog mechanism transmits the energy generated by the drive source to the nut element so that the nut element can be rotated around the axis. The male screw part of the feed screw is screwed onto the female screw part of the nut member in a state in which the rotation around the axis is limited. As a result, the feed screw does not rotate with the rotation of the nut member. Therefore, in conjunction with the rotation of the nut member, the feed screw can be moved along the axis in the first direction. In this case, the speed of the cog mechanism is controlled by the speed control mechanism. As a result, the nut member can be rotated at a predetermined rotational speed. Therefore, in conjunction with the rotation of the nut member, the feed screw can be moved at a predetermined speed in the first direction. In this way, the auxiliary force can be properly applied to the piston via the feed screw.
When the resistance force generated by the movement of the piston is low, the speed of movement of the piston becomes faster. Therefore, the feed screw provided in conjunction with the piston is in a pulled state in the first direction. In this case, at least the engaging force in the gear mechanism and the engaging force between the male screw part of the feed screw and the male screw part of the nut member can be used. as a reaction force. Therefore, it is possible to prevent the moving speed of the piston from becoming faster.
[0020] (4) The drive source may have a mainspring which generates energy by an unwinding operation.
In this case, as in the case of a mechanical timepiece, the operation of unwinding the mainspring is used to generate the rotational energy of the nut element. As a result, electrical energy from a battery is not required to discharge the chemical solution. Therefore, it is possible to provide the chemical solution pump which achieves low cost and improved safety.
[0022] (5) The feed mechanism may include a switching mechanism which switches between stopping and starting the transmission of energy from the drive source to the nut member. The feed mechanism can stop the movement of the feed screw and the piston by stopping the power transmission to the nut member, and can move the piston, depending on the driving force, while causing the adjustment mechanism to adjust the movement of the piston by starting the transmission of energy to the nut member.
In this case, the switching mechanism can be used to switch between stopping and starting the transmission of energy from the drive source to the nut member. Accordingly, for example, the nut member can be rotated at any desired time, or the rotation time of the nut member can be adjusted. In particular, the rotation of the nut member can be stopped to stop the movement of the feed screw itself provided in conjunction with the piston. As a result, the movement of the plunger in the syringe can be stopped.
[0024] Therefore, it is possible to adjust the discharge time or the discharge time of the chemical solution from the syringe. As a result, it is possible to provide the chemical solution pump which achieves practical use and excellent discharging performance.
[0025] (6) The speed control mechanism may include a paddle wheel which meshes with the cog mechanism, and is rotated by the energy associated with the unwinding operation of the mainspring. The impeller can generate a resistance corresponding to the rotational speed of the cog mechanism to control the speed of the cog mechanism. The switching mechanism may include a switching mainspring which generates switching energy by an unwinding operation, and a movable member which moves between a separation position separated from the impeller and a stop position in contact with. the impeller to stop the rotation of the impeller, based on the switching energy.
[0026] In this case, the speed of the cog mechanism can be controlled by using the resistance of the paddle wheel. As a result, for example, unlike a speed control mechanism using a spring balance in a mechanical timepiece, it is less likely that a sound will be generated. Therefore, while maintaining silence, the speed can be controlled.
In addition, the switching mechanism uses the switching energy associated with the unwinding operation of the switching spring so that the movable member is moved between the separation position and the stop position. In particular, the movable member is moved to the stop position. In this way, the rotation of the paddle wheel engaged with the cog mechanism can be stopped. As a result, the rotation of the cog mechanism itself can be stopped to stop the rotation of the nut member. In this way, it is possible to stop the movement of the feed screw provided together with the piston and the movement of the piston. In particular, as in the case of a mechanical timepiece, the switching mechanism can be configured to use the unwinding operation of the switching mainspring. As a result, electric power from a battery is not required. Therefore, it is possible to control the timing of the operation of the constant quantity supply of the piston without using the electric power.
[0028] (7) The driving unit may include a spring member which generates the driving force by using an elastic return force.
[0029] In this case, the drive unit can have a simple configuration using various spring elements such as a spiral spring, a leaf spring, a coil spring, a torsion spring, a disc spring and a volute spring. Therefore, the drive unit easily achieves low cost and simplified configuration.
[0030] (8) According to a second aspect of the present invention, there is provided a chemical solution delivery device comprising the pump for chemical solution, a main body housing housing the pump for chemical solution in its interior and being capable of being mounted on a living body surface, and an indwelling needle capable of penetrating the living body surface in a state where the living body is punctured, and in which the chemical solution discharged from the syringe is introduced.
In this case, the chemical solution discharged from the syringe by the chemical solution pump can be administered to the living body through the indwelling needle. In particular, the chemical solution pump is used so that the chemical solution can be accurately discharged from the syringe with a constant discharge amount (constant amount). Accordingly, for example, a determined amount of the chemical solution can be administered accurately and periodically. Therefore, for example, the chemical solution delivery device can be suitably used as an insulin delivery device for delivering insulin into the body.
Advantageous effects of the invention
According to one aspect of the present invention, it is possible to provide the chemical solution pump and the chemical solution delivery device which are capable of accurately discharging the chemical solution with the constant discharge amount.
Brief description of the drawings
[0033] FIG. 1 is a view illustrating a first embodiment of a pump for chemical solution and a chemical solution delivery device according to one aspect of the present invention, and is a perspective view illustrating a configuration of the assembly of the pump. chemical solution delivery device. Fig. 2 is a block diagram illustrating a simplified configuration of the chemical solution pump shown in FIG. 1. Fig. 3 is a perspective view of the chemical solution pump illustrated in FIG. 1. Fig. 4 is a top view of the chemical solution pump shown in FIG. 3. Fig. 5 is a perspective view illustrating the state in which an inner housing and a spiral spring are detached from the state illustrated in FIG. 3. Fig. 6 is a perspective view illustrating the state in which a syringe is detached from the state illustrated in FIG. 3. Fig. 7 is a perspective view of the spiral spring and the inner housing which are illustrated in FIG. 6. Fig. 8 is a perspective view illustrating the state in which the feed wheel and the periphery of the nut member are detached from the state shown in FIG. 3. Fig. 9 is a perspective view illustrating the state in which a first cover and a second cover are detached from the state shown in FIG. 3. Fig. 10 is a perspective view illustrating the state in which a second guide member is detached from the state illustrated in FIG. 9. Fig. 11 is a perspective view when the state illustrated in FIG. 3 is seen from different points of view. Fig. 12 is a view for describing the operation of the chemical solution pump according to the first embodiment, and is a view illustrating the relationship between the amount of movement of the piston and the elapsed time. Fig. 13 is a top view illustrating a second embodiment of a pump for chemical solution according to one aspect of the present invention. Fig. 14 is a view illustrating the configuration of the switching mechanism illustrated in FIG. 13. Fig. 15 is a view illustrating the relationship between a pendulum and an oscillator plate which are illustrated in FIG. 14. Fig. 16 is a view illustrating the state in which the oscillator plate is moved to the stop position from the state shown in FIG. 14. Fig. 17 is a view illustrating the state in which the oscillator plate is moved to the stop position from the state illustrated in FIG. 15. Fig. 18 is a view illustrating the state in which the oscillator plate is moved to the starting position from the state shown in FIG. 14. Fig. 19 is a view for describing the operation of the pump for chemical solution according to the second embodiment, and is a view illustrating the relationship between the amount of movement of the plunger and the time elapsed when the plunger is actuated to continuously deliver a solution. chemical after a predetermined time has elapsed. Fig. 20 is a view illustrating the relationship between the amount of movement of the piston and the time elapsed when the piston is actuated to intermittently deliver the chemical solution after a predetermined period of time. Fig. 21 is a view illustrating the relationship between the pulse voltage for a shape memory alloy wire and the discharge. Fig. 22 is a view illustrating the relationship between the amount of movement of the plunger and the time elapsed when the plunger is actuated to irregularly deliver the chemical solution after a predetermined period of time. Fig. 23 is a perspective view illustrating a third embodiment of a chemical solution pump according to an aspect of the present invention. Fig. 24 is a top view illustrating a fourth embodiment of a pump for chemical solution according to one aspect of the present invention. Fig. 25 is a perspective view of the chemical solution pump illustrated in FIG. 24. Fig. 26 is a perspective view of the chemical solution pump illustrated in FIG. 24. Fig. 27 is a perspective view of the chemical solution pump illustrated in FIG. 24. Fig. 28 is a perspective view of the chemical solution pump illustrated in FIG. 24. Fig. 29 is a view illustrating an example of modification of the adjustment mechanism according to one aspect of the present invention. Fig. 30 is a view illustrating another example of modification of the adjustment mechanism according to one aspect of the present invention. Fig. 31 is a view illustrating yet another example of modification of the adjustment mechanism according to one aspect of the present invention. Fig. 32 is a view illustrating yet another example of modification of the adjustment mechanism according to one aspect of the present invention.
Description of the embodiments
First embodiment
Hereinafter, a first embodiment of a pump for chemical solution and of a chemical solution delivery device according to one aspect of the present invention will be described with reference to the drawings.
Chemical solution delivery device
As illustrated in FIG. 1, a chemical solution delivery device 1 of the present embodiment comprises a chemical solution pump 2 which discharges a chemical solution W from a syringe 10 filled with the chemical solution W, and a main body housing 3 housed therein the pump. for chemical solution 2, and mountable on the surface of the body of a user (surface of the living body according to the present invention) S.
The chemical solution W is not particularly limited and, for example, insulin can be used. In this case, the chemical solution delivery device 1 functions as an insulin delivery device, and the chemical solution pump 2 functions as an insulin pump.
[0037] For example, the main body housing 3 is configured such that a housing body and a cover member are combined with each other, and can be mounted at a predetermined mounting location of a user. (for example, around the abdomen). In the present embodiment, the main body case 3 is formed into a rectangular parallelepiped shape having a shape of a box in order to simplify the illustration. However, the shape of the main body case 3 is not limited to this case. For example, the main body case 3 may have a circular shape, an elliptical shape or a polygonal shape in a plan view.
The mounting method for mounting the main body housing 3 on the surface of the user's body S is not particularly limited, and a known method can be adopted. For example, the housing of the main body 3 can be mounted on the body surface S by using an adhesive tape. Alternatively, a mounting member (not shown) such as a mounting clip or belt can be combined with the main body housing 3 so that the main body housing 3 is mounted on the body surface S via the. mounting element.
The main body housing 3 has an indwelling needle 4 which can enter a body using an actuator (not shown) which can perform a pushing operation.
[0040] For example, the indwelling needle 4 is of the plastic cannula type, can pierce the body with an inner needle (not shown), and may remain in the body surface S by removing the inner needle. In this way, the indwelling needle 4 can enter the body surface S in a state of perforation in the body while the housing of the main body 3 is mounted on the body surface S.
The indwelling needle 4est connected inside the syringe 10 by a flexible tube 5, for example. Therefore, the chemical solution W is discharged from the syringe 10 using the pump for chemical solution 2. In this way, the discharged chemical solution W can be introduced into the indwelling needle 4, and the chemical solution W can be administered to the indwelling needle. a user by the indwelling needle 4.
Pump for chemical solution
As illustrated in Figs. 1 to 4, the chemical solution pump 2 comprises a plate-shaped base plate 20 fixed inside the main body housing 3. Each component forming the chemical solution pump 2 is mounted on the base plate 20. Fig. 2 is a simple block diagram illustrating a simplified configuration of the chemical solution pump 2.
In the present embodiment, the thickness direction of the base plate 20 will be called the up-down direction L1, the direction separated from the body surface S will be called up, and the direction opposite to that. this will be called down. Further, in the plane of the base plate 20, in directions orthogonal to each other, one direction will be called the front-rear direction L2, and the other direction will be called the right-left direction L3.
Syringe
First, the syringe 10installed in the pump for chemical solution 2 will be briefly described.
As illustrated in Figs. 1 and 5, the syringe 10 is a so-called chemical solution container, and comprises a plunger 12 arranged to be able to slide inside the syringe 10. The syringe 10 is held by a retaining member 21 (which will be described in more detail). away) so that the syringe axis R is parallel to the front-to-back direction L2.
The syringe 10 extends along the front-to-back direction L2, and is cylindrically formed around the syringe axis R so that the syringe 10 can be filled with the chemical solution W.
In the front-to-rear directions L2, the direction in which the piston 12 is pushed into the syringe 10 will be called the forward direction (first direction according to the present invention), and the direction opposite to it will be called the direction towards rear (second direction according to the present invention). Further, when viewed in the front-rear direction L2, the direction intersecting the syringe axis R will be called the radial direction, and the direction rotating around the syringe axis R will be called the circumferential direction.
[0048] An opening part is formed on the side of the rear end part of the syringe 10. Therefore, the syringe 10 is open on the rear side when it is placed in the pump for chemical solution 2. A tube 5connected to the indwelling needle 4 can be connected to the side of the front end portion of the syringe 10. In this way, the interior of the syringe 10 and the interior of the indwelling needle 4 can communicate with each other. the other through tube 5, and chemical solution W can be supplied to indwelling needle 4 from inside syringe 10.
The piston 12 is inserted into the syringe 10 from the rear through the opening portion of the syringe 10. The piston 12 comprises a piston rod 13 extending along the front-rear direction L2, a seal portion column 14 integrally formed in the front end portion of piston rod 13, and a connecting piece 15 integrally formed in the rear end portion of piston rod 13.
The seal portion 14 can slide forward and backward along the syringe axis R inside the syringe 10. A sealing member 16 such as an O-ring is attached to the outer peripheral surface of the seal portion 14. In this manner, the seal portion 14 and the syringe 10 are sealed (liquid and airtight).
A plurality of connecting pieces 15 is formed to protrude outwardly in the radial direction from the rear end portion of the piston rod 13, and is formed at an interval in the circumferential direction. In the example illustrated, four connection pieces 15 are formed at equal intervals in the circumferential direction so as to be disposed radially around the axis of the syringe R.
However, the shape or the number of the connection pieces 15 is not limited to this case. For example, the annular connecting piece 15 can be formed such that the entire periphery protrudes outward in the radial direction from the rear end portion of the piston rod 13.
For example, the syringe 10configured as described above can be filled with the chemical solution W by transferring or aspirating the chemical solution W from a vial (also called an ampoule) previously filled with the chemical solution W.
Pump for chemical solution
As illustrated in Figs. 1 to 4, the pump for chemical solution 2 comprises the holder 21 which holds the syringe 10, the drive unit 22 which presses the plunger 12 with a predetermined drive force F1 to advance the plunger 12 into the syringe 10, the mechanism d The adjustment 23 which adjusts the movement of the piston 12 so that the piston 12 moves with the driving force F1.
The retaining member 21, the drive unit 22, and the adjustment mechanism 23 are mounted on the side of the upper surface of the base plate 20 as described above.
As illustrated in FIG. 6, the holder 21 comprises a holder base 21a disposed near the leading edge portion in the base plate 20, and a holder tool (not shown) combined with the holder base 21a.
The holding base 21a is formed to have a square or rectangular outer shape in a top view, and the size thereof corresponds to the diameter and length of the syringe 10. The upper surface of the base of holder 21a is an arcuate surface curved in the right-left direction L3 with a curvature corresponding to the outer diameter of the syringe 10. In this way, the syringe 10 can be placed on the upper surface of the holder base 21a in a state that it is positioned in the right-left direction L3.
The holding tool being combined with the holding base 21a, it is possible to keep the syringe 10placed on the holding base 21a. In this way, the syringe 10 can be held stably and reliably using the retainer 21.
As illustrated in Figs. 1 to 4, the drive unit 22 comprises a spiral spring (spring element according to the present invention) 30 which generates the driving force F1 by using an elastic return force, a movable housing 31 housed in its interior the spiral spring 30 and arranged to be movable forwards, and a guide plate 35 which guides the movable housing 31 so that it is movable.
As illustrated in FIG. 6, the guide plate 35 is disposed on the rear side of the holding member 21 and is integrally combined with the base plate 20.
The guide plate 35 comprises a flat plate body 36 in the form of a plate disposed to overlap the base plate 20, and a pair of guide rails 37 formed to protrude upwardly from the plate body 36 and to extend. along the front-to-back direction L2.
[0062] For example, the plate body 36 is formed to have a rectangular shape in a plan view in which the length along the front-to-rear direction L2 is longer than the length along the right-left direction L3. The front end portion of the plate body 36 contacts or near the rear end portion of the support base 21a. The upper surface of the plate body 36 is formed to be smooth and is a sliding surface having low friction resistance, for example.
Each of the pair of guide rails 37 is formed on the side edge portion located on both sides of the plate body 36 in the right-left direction L3, and is formed along the entire length of the plate body 36. Therefore , the two guide rails 37 are arranged parallel to each other in the state in which they face each other in the right-left direction L3. In the pair of guide rails 37, the facing surface (the inner surface) on which the guide rails 37 face is formed to be smooth, and is a sliding surface having low friction resistance, for example.
As illustrated in Figs. 4-7, the movable case 31 comprises an outer case 40 and an inner case 50 housed inside the outer case 40, and is placed on the upper surface of the plate body 36 in the guide plate 35.
The outer casing 40 comprises a front outer wall 41 and a rear outer wall 42 which are arranged to face each other in the front-rear direction L2, and a pair of outer side walls 43 arranged to face each other in the right-left direction L3 , and has a frame shape that is open up and down. In the illustrated example, the outer shape of the outer case 40 is a rectangular shape in a plan view in which the length along the front-to-rear direction L2 is longer than the length along the right-left direction L3.
The pair of outer side walls 43 is disposed inside the pair of guide rails 37, and is in contact with or near the guide rails 37. In this way, the entire movable housing 31 can be moved on the upper surface of the plate body 36 in the front-to-back direction L2 with less clicking while being guided by the pair of guide rails 37. Therefore, the entire movable housing 31 can be moved in the front-to-back direction L2 in an excellent rectilinear fashion.
The front outer wall 41 has an insertion hole 45 which penetrates into the front outer wall 41 in the front-rear direction L2et is open upwards and downwards. The piston rod 13 enters the interior of the outer housing 40 from the rear side through the insertion hole 45. In this way, the connection piece 15 formed in the rear end portion of the piston rod 13 is disposed at the back. 'inside the outer casing 40. The connection piece 15 is in contact with the front outer wall 41 from the rear face.
The inner case 50 comprises front inner walls 51 facing in the front-rear direction L2 with a space of the front outer wall 41 of the outer case 40, and a pair of inner side walls 52 arranged to face each other in the right direction. left L3, and is formed into a frame shape having the shape of C in a plan view, which is open up, down and back. In the illustrated example, the outer shape of the inner case 50 is formed such that the length along the front-rear direction L2 is longer than the length along the right-left direction L3 to match the outer case 40.
The pair of inner side walls 52 is disposed inside the pair of outer side walls 43. In this way, the entire inner case 50 is housed inside the outer case 40, and is movable in the forward direction. - rear L2 together with the outer casing 40.
The inner front wall 51sticks and fixes the connection piece 15 in the piston 12 between the front outer wall 41 and the front inner wall 51. In this way, the rear end portion of the piston rod 13 and the movable housing 31 are integral with each other and are connected to each other. Therefore, the piston rod 13 and the movable housing 31 are integrally movable in the front-rear direction L2.
As illustrated in FIG. 7, the spiral spring 30 is formed by spirally winding a long strip-like material (eg, metal) having a thin thickness and a predetermined width. The spiral spring 30 is housed inside the inner case 50 in the position in which the center line is parallel to the right-left direction L3. In this case, as shown in Fig. 6, the outer end portion 30a of the spiral spring 30 is pulled forward of the movable case 31 from the underside of the inner case 50 and the outer case 40, and is connected to the holding base 21a in the holding member 21. .
[0072] Therefore, an elastic return force acts on the spiral spring 30 so that the spiral spring 30 restores the original state by winding on the side of the outer end portion 30a.
In the drive unit 22configured as described above, the spiral spring 30tends to restore and deform to the original state by winding on the side of the outer end portion 30a. As a result, the winding portion housed inside the inner case 50 of the spiral spring 30 can be moved forward by the elastic return force. In this way, the whole of the movable housing 31 can be moved forward, and the piston 12 is moved forward by the driving force F1 generated by the elastic return force of the spiral spring 30 so that the piston 12 is pushed into syringe 10.
[0074] For example, compared to a coil spring, the spiral spring 30 has the characteristic that the elastic return force is substantially constant while the spiral spring 30 restores the original state by being wound from a state. stretched, and therefore can be used appropriately as a so-called constant load spring. Therefore, in the present embodiment, the piston 12 can be pressed with the predetermined constant driving force (constant pressure driving force) F1.
As illustrated in FIG. 2, the adjustment mechanism 23 is a mechanism which applies an auxiliary force F2 (positive thrust) to the piston 12 in the forward direction or a reaction force F3 (negative thrust) to the piston 12 in the backward direction, according to the difference between the resistance force generated by the movement of the piston 12 inside the syringe 10 and the driving force F1 generated by the driving unit 22.
The configuration will be described in detail below.
As illustrated in Figs. 1 to 4, the adjustment mechanism 23 comprises a feed screw (movable body according to the present invention) 60 arranged to be movable in conjunction with the piston 12, a feed mechanism 61 which moves the feed screw 60 forward at the same time. a predetermined speed and applies the auxiliary force F2 to the piston 12 via the feed screw 60, and a braking unit 63 which applies the reaction force F3 to the piston 12 backwards via the feed screw 60.
The feed screw 60est disposed on the rear side of the movable housing 31, and is arranged to be movable in the front-rear direction L2le along a first axis (axis according to the present invention) O1disposed coaxially with the 'syringe axis R.
A male screw portion 60a is formed along the entire length on the outer peripheral surface of the feed screw 60. Further, the front end part of the feed screw 60 is integrally combined. with the rear outer wall 42 of the outer casing 40 via a connecting nut 65. Therefore, the feed screw 60 is connected in series with the piston 12 via the movable casing 31, and is movable in the front-rear direction L2 in connection with the piston 12. .
In addition, the feed screw 60est associated with the movable housing 31 so that the rotation about a first axis 01est limited.
The feed screw 60configured as described above is guided by a first guide member 72 provided in a first support portion 70 erected on the upper surface of the base plate 20, and a second guide member 82 provided in a second support portion 80 erected on the upper surface of the base plate 20.
As illustrated in FIG. 8, the first support portion 70 comprises a first support base 71 disposed on the rear side of the rear outer wall 42 in the outer housing 40, a first guide member 72 held by the first support base 71, and a first cover 73 which supports the first. guide element 72 from above.
The first support base 71maintains the first guide element 72from the bottom to allow it to be detachable upward. In addition, a first restriction wall 71a which comes into contact with the first guide member 72 from the rear is formed at the upper end portion of the first support base 71. Therefore, the first guide member 72 is maintained. by the first support base 71 in a state in which rearward movement is limited by the first restriction wall 71a. The first guide member 72 has an annular shape having an insertion hole into which the feed screw 60 is inserted, and guides the feed screw 60.
[0084] For example, the first guide member 72 is a ball bearing having an inner ring, an outer ring and a plurality of balls. However, the first guide member 72 is not limited to the ball bearing. In each drawing, the first guide member 72 is illustrated in a simplified manner.
As illustrated in Figs. 3 and 9, the second support part 80 comprises a second support base 81 disposed on the rear face of the first support base 71 in a state in which it has a gap with respect to the first support base 71, a second guide member 82 maintained. by the second support the base 81, and a second cover 83qui presses the second guide element 82from the top.
The second support base 81maintains the second guide element 82from the bottom so that it is detachable upward. In addition, a second restriction wall 81a which comes into contact with the second guide member 82 from the front is formed in the upper end portion of the second support base 81. Therefore, the second guide member 82 is retained. by the second support base 81 in a state in which the forward movement is limited by the second restriction wall 81a. The second guide member 82 has an annular shape having an insertion hole into which the feed screw 60 is inserted, and guides the feed screw 60.
[0087] For example, the second guide member 82 is a ball bearing having an inner ring, an outer ring and a plurality of balls. However, the second guide member 82 is not limited to the ball bearing. In each drawing, the second guide member 82 is illustrated in a simplified manner.
The feed screw 60est configured as described above. Accordingly, for example, when assembled, the feed screw 60 is integrally combined with the outer housing 40 in the movable housing 31 using a connecting nut 65, and the first guide member 72 and the second member. guide 82 are attached to the feed screw. 60. Then, the first guide member 72 is incorporated into the first support base 71 from above, and the movable housing 31 is placed on the guide plate 35 while the second guide member 82 is incorporated into the second support base 81 from above. . Then, the first cover 73 is combined with the first support base 71, and the second cover 83 is combined with the second support base 81. In this way, the movable housing 31 and the feed screw 60 which are combined with each other. other one piece can be assembled to each other.
As illustrated in Figs. 10 and 11, the feed mechanism 61 has a female screw part (not shown) screwed to the male screw part 60a of the feed screw 60, and includes a nut member 90 screwed onto the feed screw 60, a mainspring (drive source according to the present invention) 91 which generates energy (rotational torque) to rotate the nut member 90, a gear mechanism 92 which transmits energy from the mainspring 91 to the nut member nut 90, and a speed control mechanism 93 which controls the speed of the cog mechanism 92.
As illustrated in FIG. 10, the nut member 90 is screwed onto a part between the first support part 70 and the second support part 80 in the feed screw 60, and is integrally formed with a feed wheel 100 arranged for be able to rotate around the first axis O1. In this way, the nut member 90 can rotate about the first axis O1 in association with the rotation of the feed wheel 100.
In the example illustrated, by way of example, the nut element 90 is disposed between the feed wheel 100 and the second support part 80. However, the present invention is not limited to this case. , and the nut member 90 may be provided between the feed wheel 100 and the first support portion 70.
In particular, the nut member 90 and the feed wheel 100 are arranged to be stitched between the first support part 70 and the second support part 80, thus limiting the movement in the front-rear direction L2.
As illustrated in Figs. 10 and 11, the cog mechanism 92 comprises a driving wheel 101 rotating around a second axis O2 by the energy generated by the driving spring 91, a first intermediate wheel 102 rotating around a third axis 03 in association with the rotation of the driving wheel 101 , a bevel wheel 103 rotating around a fourth axis O4 in association with the rotation of the first intermediate wheel 102, and a second intermediate wheel 104 rotating around the fourth axis O4 jointly with the bevel wheel 103.
[0094] However, the number or the arrangement relation of the wheels forming the cog mechanism 92 is not limited to this case, and can be modified if necessary.
The driving wheel 101 is disposed on the upper surface of the base plate 20 in a state in which the second axis O2 is parallel to the ascending-descending direction L1. In the example illustrated, the driving wheel 101 is arranged in a position separated from the guide plate 35 in the right-left direction L3. The drive wheel 101 includes a drive shaft portion 101a and a drive gear 101b integrally formed with the drive shaft portion 101a. The mainspring 91 is disposed under the drive gear 101b.
The mainspring 91 is equivalent to that used in a mechanical timepiece, is formed in the shape of a spiral and can generate energy by an unwinding operation.
The mainspring 91 is housed in a housing part (not shown) such as a complete barrel in the mechanical timepiece, and the outer end part thereof is fixed inside the part of housing. The inner end part of the mainspring 91 is locked to the drive shaft part 101a. In this way, the drive shaft portion 101a is rotated around the second axis 02 so that the mainspring 91 can be wound to reduce the diameter.
Further, the inner end portion of the mainspring 91est locked to the drive shaft portion 101a. Therefore, the entire drive wheel 101 can be rotated about the second axis O2 by unwinding the drive spring 91 to enlarge the diameter.
A clutch mechanism (not shown) such as a one-way clutch is provided between the drive shaft portion 101a and the drive gear 101b. In the clutch mechanism, when the drive shaft portion 101a is rotated in the winding direction of the mainspring 91, the drive shaft portion 101a is idle relative to the gear of training 101b. When the drive shaft portion 101a rotates in association with the unwinding operation of the mainspring 91, the drive gear 101b and the drive shaft portion 101a rotate together. In this way, the drive gear 101b can only rotate when the mainspring 91 is unwound.
[0100] The first intermediate wheel 102est disposed on the upper surface of the base plate 20 in a state in which the third axis 03 is parallel to the ascending-descending direction L1. In the example illustrated, the first intermediate wheel 102 is located on the rear side of the drive shaft portion 101a, and is arranged to be located between the guide plate 35 and the drive wheel 101. The first intermediate wheel 102 engages with the drive gear 101b of the drive wheel 101. In this way, the first intermediate wheel 102 can rotate about the third axis O3 in association with the drive wheel 101.
[0101] The bevel wheel 103 is rotatably attached to a rotating shaft portion 106 attached to a base 105 erected on the upper surface of the base plate 20. The base 105 is arranged to be adjacent to the first support portion 70 at an interval in the right-left direction L3. The rotary shaft portion 106 is arranged to be parallel to the front-to-rear direction L2, and is supported by the pedestal 105 in a cantilever manner. The center line of the rotary shaft portion 106 is the fourth axis O4.
[0102] The bevel wheel 103 is rotatably fixed to the rotating shaft portion 106 in the state of engagement with the first intermediate wheel 102. In this way, the bevel wheel 103 can rotate about the fourth axis O4 in association with the rotation of the first intermediate wheel 102.
[0103] The second intermediate wheel 104 is rotatably attached to the rotating shaft portion 106 in the state of being integrally combined with the bevel wheel 103. Therefore, the second intermediate wheel 104 can rotate together around the shaft. fourth axis 04in association with the rotation of the bevel wheel 103. Then, the second intermediate wheel 104 meshes with the feed wheel 100.
[0104] The cog mechanism 92est configured as described above. Accordingly, the energy generated by the unwinding operation of the mainspring 91 can be transmitted to the feed wheel 100 via the drive wheel 101, the first intermediate wheel 102, the bevel wheel 103, and the second intermediate wheel 104, and the feed wheel 100 can be rotated around the first axis O1 with the nut element 90.
[0105] As illustrated in FIGS. 10 and 11, the speed control mechanism 93 comprises an exhaust 110 which controls the rotation of the cog mechanism 92 described above, and a speed controller 120 which controls the speed of the exhaust 110. The exhaust 110 and the speed controller 120 have configurations identical to those generally used for a mechanical timepiece. Therefore, a detailed description of the exhaust 110 and the speed controller 120 will be omitted.
[0106] The exhaust 110 comprises an intermediate wheel 111 rotating around a fifth axis O5 in association with the rotation of the driving wheel 101, and an escape wheel 112 rotating around a sixth axis O6 in association with the rotation of the intermediate wheel 111, and an anchor 113 which allows the escape wheel 112 to rotate smoothly, and can control the gear mechanism 92 using regular vibrations of a sprung balance 122 (which will be described later).
[0107] The intermediate wheel 111est disposed on the upper surface of the base plate 20 in the state in which the fifth axis O5 is parallel to the ascending-descending direction L1. In the illustrated example, the intermediate wheel 111 is located on the front side of the drive shaft portion 101a, and is arranged to be located between the guide plate 35 and the drive wheel 101. The intermediate wheel 111 has a pinion. intermediate 111a meshing with drive gear 101b in drive wheel 101, and an intermediate gear 111b. In this way, the intermediate wheel 111 can rotate around the fifth axis O5 in association with the driving wheel 101.
[0108] The intermediate wheel 111 is not essential and may not be provided. For example, escape wheel 112 can be configured to rotate in association with drive wheel 101.
The escape wheel 112est disposed on the front side of the intermediate wheel 111 in the state in which the fifth axis 05is parallel to the ascending-descending direction L1. The escape wheel 112 includes an escape pinion 112a meshing with the intermediate gear 111b and an escape gear 112b having a plurality of escape teeth. In this way, the escape wheel 112 can rotate about the sixth axis O6 in association with the rotation of the intermediate wheel 111.
[0110] The anchor 113a, an inlet vane 113a and an outlet vane 113b which are disposed on the front side of the escape wheel 112, can pivot (can oscillate) on the basis of a back-and-forth rotation. - comes from the sprung balance 122, and can engage and disengage from the escape teeth of the escape wheel 112. The input pallet 113a and the output pallet 113b can alternately engage and disengage from the exhaust teeth in association with the pivoting of the anchor 113.
[0111] Consequently, the inlet vane 113a and the outlet vane 113b alternately engage and disengage from the exhaust teeth in association with the pivoting of the anchor 113. In this way, the rotation of the wheel exhaust 112 can be controlled, and the energy transmitted to the escape wheel 112 can be transmitted to the sprung balance 122 via the anchor 113 and a pulse pin 114 so that the spring balance 122 can be replenished with rotational energy.
[0112] The speed controller 120 comprises a hairspring 121 and a hairspring balance 122 which performs an alternating rotation (forward and backward rotation) about a seventh axis O7 with a constant amplitude (angle of oscillation) using the hairspring 121 as the source of energy. energy.
The sprung balance 122est disposed on the front side of the anchor 113 in the state in which the seventh axis O7 is parallel to the ascending-descending direction L1. The spring balance 122 includes a balance 122a arranged coaxially with the seventh axis O7.
[0114] The hairspring 121est formed in the form of a spiral around the seventh axis O7, and is elastically deformable to enlarge and reduce the diameter. The inner end portion of the hairspring 121 is locked to the hairspring 122 via a double roller (not shown). In this way, the spring balance 122 can rotate back and forth around the seventh axis 07 using the balance spring 121 as a power source.
[0115] The speed control mechanism 93 having the exhaust 110 and the speed controller 120 which are configured as described above are provided. Accordingly, the energy generated by the unwinding operation of the mainspring 91 is used so that the feed wheel 100 can rotate about the first axis O1 at a predetermined rotational speed.
[0116] In this way, the feed screw 60 whose rotation around the first axis O1 is restricted can be advanced at a predetermined speed, and the auxiliary force F2 can be applied to the piston 12 via the movable housing 31.
[0117] The nut member 90 is screwed onto the feed screw 60, and the male screw part 60a and the female screw part mesh with each other. Therefore, for example, when the feed screw 60 is pulled forward by the drive unit 22, the male screw part 60a of the feed screw 60 is in a state of being pressed forward. forward with respect to the female screw portion of the nut member 90. Therefore, in addition to an engaging force between the gears in the gear mechanism 92 described above, an engaging force of 1. The nut member 90 and the feed screw 60 can be used as the reaction force F3.
[0118] Therefore, as illustrated in Figs. 2 and 10, at least the male screw part 60a of the feed screw 60 and the female screw part of the nut member 90 function as the braking unit 63 which applies the reaction force F3 to the piston 12 backwards via the feed screw 60.
Operation of the chemical solution delivery device
[0119] Next, a case will be described in which the chemical solution W is administered to the user's body using the chemical solution delivery device 1 configured as described above.
[0120] As the initial state in this case, as illustrated in FIG. 1, the chemical solution delivery device 1 is mounted on the body surface S of the user, and the indwelling needle 4 inhabits the body surface S in the state of perforation in the body. Further, the syringe 10 filled with the chemical solution W is placed in the holding member 21 of the pump for chemical solution 2. Further, the movable housing 31 is located on the rear face of the guide plate 35, the piston 12 is adjusted. to the start pushing position, and the mainspring 91 is properly wound to accumulate energy.
[0121] When the chemical solution W begins to be administered in the initial state described above, as illustrated in FIGS. 2 and 3, the piston 12 can be pushed forward by the drive unit 22 with the predetermined driving force F1 (predetermined constant driving force F1), and the piston 12 can be pushed forward through the housing. movable 31 by moving the feed screw 60 forward at a predetermined speed.
This configuration will be described in detail.
[0123] First, the spiral spring 30 in the drive unit 22 attempts to restore and deform to the original state by winding up on the side of the outer end portion 30a. In this case, the outer end portion 30a of the spiral spring 30est connected to the retaining base 21a. As a result, the side of the winding part accommodated inside the inner case 50 in the spiral spring 30 can be moved forward by the elastic restoring force by using the side of the outer end part 30a as base point. In this way, the whole of the movable housing 31 can be moved forward, and the piston 12 can be moved forward by the driving force F1 generated by the elastic return force of the spiral spring 30.
[0124] As a result, the plunger 12 can be pushed into the syringe 10, and the chemical solution W inside the syringe 10 can be discharged to the side of the indwelling needle 4.
[0125] In particular, when the piston 12 is pressed using the driving force F1, the adjustment mechanism 23 applies the auxiliary force F2 in the forward direction in which the piston 12 moves in the syringe 10, or applies the force. reaction force F3 in the rearward direction opposite to it according to the difference between the resistance force generated by the movement of the piston 12 inside the syringe 10 and the driving force F1.
[0126] For example, when the piston 12 is pushed forward using the constant driving force F1, it is preferable that the displacement speed per unit time is ideally constant as illustrated by the solid line illustrated in FIG. . 12, and the momentum of piston 12 has linearity.
[0127] However, the resistance force (eg, the slip resistance generated between the syringe 10 and the plunger 12 or the viscous resistance of the chemical solution W) actually generated by the movement of the plunger 12 is changed. Accordingly, as indicated by the dotted line shown in FIG. 12, even when the piston 12 is pressed with the constant driving force F1, the speed of movement per unit time is changed according to the resistance force, and the amount of movement is changed.
[0128] That is, when the resistance force is large, the speed of movement of the piston 12 becomes slower, and the amount of movement per unit time of the piston 12 decreases as indicated in section T1illustrated in FIG. . 12. On the other hand, when the resistance force is small, the displacement speed of the piston 12 becomes faster, and the amount of movement per unit time of the piston 12 increases as shown in sections T2 and T3 shown in FIG. 12.
[0129] In the present embodiment, the adjustment mechanism 23 is provided. Accordingly, in the section T1 described above, the auxiliary force F2 (i.e. the positive thrust) is applied to the piston 12 in the forward direction. In this way, it is possible to increase the speed of movement of the piston 12. On the other hand, in the sections T2 and T3 described above, the reaction force F3 (i.e. negative thrust) is applied to piston 12 in the rear direction. In this way, it is possible to prevent the moving speed of the piston 12 from becoming faster.
[0130] In this way, the adjustment mechanism 23 can correct the movement speed to compensate for the influence of the resistance force by applying the auxiliary force F2 or the reaction force F3 to the piston 12, depending on the difference between the resistance force generated by the movement of the piston 12 inside the syringe 10 and the driving force F1. Therefore, the piston 12 can be moved by the driving force F1 applied from the driving unit 22.
[0131] Accordingly, as indicated by a solid line illustrated in FIG. 12, it is possible to move the plunger 12 with a constant amount of movement (constant amount), and the chemical solution W can be precisely discharged from the syringe 10 with a constant amount of discharge (constant amount). Therefore, it is possible to provide the chemical solution pump 2 having excellent discharge accuracy.
[0132] Therefore, according to the chemical solution delivery device 1 of the present embodiment comprising the chemical solution pump 2, a determined amount of the chemical solution W can be periodically delivered into the body through the indwelling needle. 4, for example.
[0133] For example, the driving force F1 and the auxiliary force F2 can be appropriately adjusted by adjusting the curvature of the spiral spring 30 or the reduction ratio of the gear mechanism 92. Accordingly, depending on the use or of the type of chemical solution W, the speed of movement of the piston 12 can be changed when the chemical solution W is administered.
[0134] As described above, according to the chemical solution delivery device 1 and the chemical solution pump 2 of the present embodiment, the chemical solution W can be discharged precisely with the constant discharge amount. Therefore, for example, the chemical solution delivery device 1 and the chemical solution pump 2 can be suitably used as an insulin pump and an insulin delivery device which are excellent in discharge precision and discharge reliability.
[0135] A case will be described in detail in which the auxiliary force F2 and the reaction force F3 are applied to the piston 12 using the feed screw 60.
[0136] As illustrated in FIG. 11, when the energy is generated by the unwinding operation of the mainspring 91, the driving wheel 101 is rotated by the energy. Accordingly, the first intermediate wheel 102, the bevel wheel 103, and the second intermediate wheel 104 can be rotated sequentially in association with the rotation of the drive wheel 101, and finally, the feed wheel 100 can be rotated. In this way, the feed wheel 100 can be rotated about the first axis O1 together with the nut member 90. The rotation about the first axis O1 is limited. As a result, the feed screw 60 does not rotate in conjunction with the rotation of the nut member 90. Therefore, the feed screw 60 can be moved forward along the first axis O1 in association with the rotation of the nut. nut element 90.
[0137] In this case, the speed of the cog mechanism 92 is controlled by the speed control mechanism 93 having the exhaust 110 and the speed controller 120. Accordingly, the energy generated by the unwinding operation of the mainspring 91 is used so that the feed wheel 100 and the nut member 90 can be rotated about the first axis O1 at a predetermined rotational speed. Therefore, the feed screw 60 can be moved forward at a predetermined speed.
[0138] The feed screw 60 is moved forward at the predetermined speed in this manner. As a result, the auxiliary force F2 can be applied to the piston 12 via the movable housing 31.
[0139] Further, for example, when the resistance force generated by the movement of the piston 12 is low and the feed screw 60 is pulled forward by the resistance force, the male screw portion 60a of the screw 60 is in the state of being pressed forward with respect to the female screw portion of the nut member 90. Therefore, in addition to the engaging force between the gears in the mechanism gear 92, the meshing force of the feed screw 60 and the nut member 90 can be used to apply the reaction force F3 to the piston 12 in the reverse direction. As a result, it is possible to prevent the moving speed of the piston 12 from becoming faster.
[0140] In particular, according to the pump for chemical solution 2 and the chemical solution delivery device 1 of the present embodiment, the driving force F1 is generated by using the spiral spring 30, and the driving force to make turning the nut member 90 is generated by the unwinding operation of the mainspring 91. Therefore, the electric energy of a battery is not required to discharge the chemical solution W. Therefore, since the energy electric is not used, low cost can be easily achieved, and safety can be improved.
[0141] Further, the drive unit 22 can have a simple configuration using the spiral spring 30. Therefore, the drive unit 22 easily achieves low cost and simplified configuration in this regard.
Second embodiment
[0142] Next, a second embodiment of a pump for chemical solution according to an aspect of the present invention will be described with reference to the drawings. In the second embodiment, the same reference numbers will be assigned to the configuration items in the same way as the configuration items in the first embodiment, and their description will be omitted.
[0143] As illustrated in FIG. 13, a chemical solution pump 130 of the present embodiment includes a switching mechanism 131 which switched between stopping and starting the transmission of energy from the mainspring 91 to the nut member 90.
The switching mechanism 131 is a mechanism for adding a so-called start and stop function, and is provided in an intermediate part of the transmission path in which the energy generated by the mainspring 91 is transmitted to the element. nut 90. In the present embodiment, the switching mechanism 131 is provided next to the spring balance 122 forming the speed regulator 120.
[0145] As illustrated in FIGS. 14 and 15, the switching mechanism 131 comprises an oscillator plate 132 disposed adjacent to the spring balance 122 and supported on the upper surface of the base plate 20 to be able to oscillate, and an operating unit 133 which controls the oscillation of the plate. oscillator 132.
[0146] For example, the oscillator plate 132 is formed of a metallic material and is a magnetic body. The oscillator plate 132 is formed to extend along the up-down direction L1, and an oscillating shaft portion 135 is provided on the side of the lower end portion. Oscillator plate 132 can oscillate to reciprocate between a stop position P1 (lock position) shown in Figs. 16 and 17 which is close to the spring balance 122 around the oscillating shaft portion 135 and a starting position P2 (unlock position) shown in FIG. 18 which is separate from the spring balance 122.
[0147] In Figs. 13-18, the spring balance 122 is simplified in the illustration, and the balance wheel 122a is mainly illustrated.
[0148] As illustrated in FIGS. 14 and 15, an upper end portion of the oscillator plate 132a a first operating surface 132a facing the side of the balance wheel 122a and a second operating surface 132b facing the side opposite the first operating surface 132a. A first magnet 136 which attracts the balance wheel 122a when the oscillator plate 132 is located at the stop position P1 is attached to the first actuating surface 132a.
[0149] Further, the base plate 20 is provided with a retaining wall portion 137 which is to be located on the side opposite the spring balance 122 through the oscillator plate 132. A second magnet 138 which attracts the second surface of the spring. operation 132b when the oscillator plate 132 is located at the starting position P2 is attached to the retaining wall portion 137.
[0150] The oscillator plate 132 is configured as described above. Accordingly, when the oscillator plate 132 is located at the stop position P1, the rotation of the spring balance 122 can be stopped by a magnetic force acting between the first magnet 136 and the balance wheel 122a, and the state in which the oscillator plate 132 is positioned at the stop position P1 can be held.
[0151] Further, when the oscillator plate 132 is located at the start position P2, the state in which the oscillator plate 132 is positioned at the start position P2 can be maintained by a magnetic force acting between the second magnet. 138 and the second actuation surface 132b.
[0152] As illustrated in FIG. 14, the actuation unit 133a functions to oscillate the oscillator plate 132 around the oscillator shaft portion 135 so that the oscillator plate 132 is located either at the stop position P1 or at the position start P2. Figs. 14 and 15 illustrate a transition state where the oscillator plate 132 is located between the stop position P1 and the start position P2.
[0153] The operating unit 133 comprises a first shape memory alloy wire 140 and a second shape memory alloy wire 141 which are connected to the oscillator plate 132, and a control unit 142 which controls the power-on. by applying a predetermined pulse voltage to the first shape memory alloy wire 140 and the second shape memory alloy wire 141.
[0154] For example, the first shape memory alloy wire 140 and the second shape memory alloy wire 141 are nickeltitanium alloy wires, and are wires that instantly retract when energized and heated, and which stretch when heat is radiated.
[0155] One side of the end portion of the first shape memory alloy wire 140 is connected to the oscillator plate 132, and retracts to pull the oscillator plate 132 to the stop position P1 so that the oscillator plate 132 can be moved to the stop position P1. One end portion side of the second shape memory alloy wire 141 is connected to the oscillator plate 132, and retracts to pull the oscillator plate 132 to the starting position P2 so that the oscillator plate 132 can be shifted to the starting position P2.
[0156] The first shape memory alloy wire 140 and the second shape memory alloy wire 141 are electrically connected to the control unit 142, and a predetermined voltage is applied individually from the control unit 142. In addition, the oscillator plate 132 is formed of a material having a higher thermal conductivity than that of the first shape memory alloy wire 140 and that of the second shape memory alloy wire 141. In this way, the plate Oscillator 132 also functions as a heat radiating body which radiates heat from the first shape memory alloy wire 140 and the second shape memory alloy wire 141. Therefore, the first shape memory alloy wire 140 and the second shape memory alloy wire 140. second wire of shape memory alloy 141 can shrink by heating and thereafter, can be quickly radiated to release the shrunken state, and can be moved to the stretched state (loose state).
[0157] For example, the control unit 142 can instantly apply a pulse voltage to each of the first shape memory alloy wire 140 and the second shape memory alloy wire 141 to effect rapid heating. In this way, the oscillator plate 132 can oscillate at any time desired to be moved to the stop position PI or the start position P2.
Operation of the chemical solution pump
[0158] According to the chemical solution pump 130 of the present embodiment configured as described above, it is possible to obtain operational effects identical to those of the first embodiment, and furthermore, the following operational effects may be in further obtained.
[0159] That is, in a case of the chemical solution pump 130 of the present embodiment, the switching mechanism 131 can be used to toggle between stopping and starting the power transmission of the spring. motor 91 to the nut member 90. Accordingly, for example, the nut member 90 can be rotated at any desired time, and the rotation time of the nut member 90 can be adjusted. . In particular, the rotation of the nut member 90 can be stopped to stop the movement of the feed screw 60 itself provided in conjunction with the plunger 12. Therefore, the movement of the plunger 12 in the syringe 10 can be stopped.
[0160] Therefore, it is possible to adjust the discharge time or the discharge time of the chemical solution W from the syringe 10. Accordingly, it is possible to provide the pump for chemical solution 130 which realizes the convenient use and excellent discharge performance.
This configuration will be described in detail.
[0162] In the initial state, as illustrated in FIGS. 16 and 17, the oscillator plate 132 is located in the stop position P1. In this way, the rotation of the entire balance spring 122 can be limited by a magnetic force between the first magnet 136 and the balance wheel 122a. Therefore, the rotation of the drive wheel 101 can be restricted, and similarly, the rotation of the supply wheel 100 and the nut member 90 can be restricted. In this way, it is possible to maintain the state in which the operation of the chemical solution pump 130 is stopped.
[0163] Therefore, for example, the state in which the administration of the chemical solution is stopped can be maintained while the main housing 3 is mounted on the body surface S.
[0164] When the administration of the chemical solution begins from the initial state described above, the control unit 142 instantly applies a pulse voltage to the second shape memory alloy wire 141 to quickly heat the second. shape memory alloy wire 141. In this way, as shown in FIG. 18, the second shape memory alloy wire 141 can shrink, and the oscillator plate 132 can oscillate from the stop position P1 to the start position P2. In this way, the first magnet 136 can be separated from the balance wheel 122a, and the oscillator plate 132 can be positioned at the starting position P2 by the magnetic force between the second magnet 138 and the second actuating surface 132b.
[0165] After the oscillator plate 132 has been positioned at the start position P2 by magnetic force, the second shape memory alloy wire 141 radiates heat. As a result, the second shape memory alloy wire 141 is moved from a retracted state to a loose state.
[0166] The oscillator plate 132 is located at the starting position P2, and the first magnet 136 is separated from the balance wheel 122a. In this way, the rotation of the spiral balance 122 can be started by the energy of the balance spring 121, and the rotation of the driving wheel 101 can be started by the energy of the mainspring 91. In this way, the gear mechanism 92 can be started. used in the state in which the speed is controlled. Accordingly, the feed wheel 100 and the nut member 90 can be rotated to move the feed screw 60 forward at a predetermined speed.
[0167] Accordingly, as in the first embodiment, the piston 12 can be moved forward based on the driving force F1 while the movement of the piston 12 is adjusted by the adjustment mechanism 23, and the movement of the piston 12 is adjusted. chemical solution W can be discharged with a constant discharge amount to be delivered into the body.
[0168] In this way, according to the chemical solution pump 130 of the present embodiment, the operation can start at any desired time. Therefore, for example, as shown in Fig. 19, the following operating method can be adopted. After a predetermined period of time PT from when the main body case 3 is mounted, the piston 12 starts to move so that the chemical solution W is continuously administered.
[0169] In addition, as illustrated in FIG. 20, chemical solution W can be administered intermittently instead of continuous administration of chemical solution W.
[0170] In this case, as illustrated in FIG. 21, From the initial state described above, the control unit 142 instantly applies a pulse voltage to the second shape memory alloy wire 141 so that the second shape memory alloy wire 141 retracts. In this way, the oscillator plate 132 can oscillate from the stop position P1 to the start position P2, and can be positioned to the start position P2. As a result, the rotation of the spring balance 122 and the drive wheel 101 can begin. In this way, as described above, the feed screw 60 can be moved forward at a predetermined speed, and the chemical solution W can be administered with a constant discharge amount.
[0171] Then, after a prescribed period of administration, the control unit 142 instantly applies a pulse voltage to the first shape memory alloy wire 140 so that the first shape memory alloy wire 140 retracts. . In this way, the oscillator plate 132 can oscillate from the start position P2 to the stop position P1. Therefore, the rotation of the spring balance 122 can be stopped by the magnetic force between the first magnet 136 and the balance 122a, and the oscillator plate 132 can be positioned at the stop position P1. In this way, the operation of the chemical solution pump 130 can be stopped by stopping the rotation of the spring balance 122 and the drive wheel 101. As a result, the administration of the chemical solution W can be stopped.
[0172] Then, after a prescribed period of time for stopping the administration of the chemical solution, the administration of the chemical solution W described above is started and stopped several times. In this way, as illustrated in Figs. 20 and 21, batch and intermittent administration can be carried out by repeatedly administering the chemical solution with a time interval several times (second time and third time).
[0173] When the chemical solution is administered repeatedly with an interval of time several times, for example, as illustrated in FIG. 22, the following operating method can be adopted. It is possible to perform an irregular administration in which the chemical solution W is administered irregularly, lengthening the second administration time.
[0174] In this way, according to the pump for chemical solution 130 of the present embodiment, there is provided a switching mechanism 131. Accordingly, it is possible to adjust the discharge time or the discharge time of the chemical solution. W of the syringe 10. Accordingly, it is possible to provide the chemical solution pump 130 which achieves convenient use and can be used in various ways corresponding to various purposes.
Example of modification of the second embodiment
[0175] In the second embodiment described above, the second magnet 138 is fixed on the side of the holding wall portion 137. However, the present invention is not limited to this case. For example, as in the first magnet 136, the second magnet 138 can be attached to the second actuating surface 132b of the oscillator plate 132. In this case, the side of the holding wall 137 can be the magnetic body.
[0176] Further, in the second embodiment described above, a configuration is adopted so that the rotation of the spring balance 122 is limited by using the magnetic force between the first magnet 136 and the balance wheel 122a. However, the present invention is not limited to the case of using the magnetic force. For example, the first magnet 136 can be omitted, the first actuating surface 132a can be pressed against the outer peripheral surface of the balance wheel 122a, and a frictional force acting between the first actuating surface 132a and the balance wheel. balance wheel 122a can be used to restrict the rotation of the balance spring 122.
[0177] Further, in the second embodiment described above, a configuration is adopted such that the oscillator plate 132 oscillates using the stretching and shrinking property of the first shape memory alloy wire 140 and of the second shape memory alloy wire 141. However, the configuration is not limited to this case. As long as the oscillator plate 132 can oscillate between the stop position P1 and the start position P2, the operating unit 133 can be configured appropriately without using the shape memory alloy wire.
[0178] Further, in the embodiment described above, a configuration is adopted so that the rotation of the spring balance 122 is limited and the restriction is released to switch between stopping and starting the transmission. energy from the mainspring 91 to the nut member 90. However, not limited to the case of use of the sprung balance 122, the switching mechanism 131 may be provided in an intermediate portion of a path for transmitting energy to the spring. the nut member 90. Even so, the same operational effects can be obtained.
[0179] However, the spring balance 122is a component which rotates with a small torque. As a result, the holding force required to restrict the rotation of the spring balance 122 can be minimized. Therefore, it is possible to prevent the switching mechanism 131 itself from increasing in size, and it is easy to realize a simplified configuration.
Third embodiment
[0180] Next, a third embodiment of a pump for chemical solution according to an aspect of the present invention will be described with reference to the drawings. In the third embodiment, the same reference numbers will be assigned to configuration elements identical to the configuration elements in the first embodiment, and their description will be omitted.
[0181] In the first embodiment, the speed control mechanism 93 controls the speed of the cog mechanism 92 using the escapement 110 having the escape wheel 112 and the anchor 113, and the speed controller 120 having the spring balance. 122. However, in the present embodiment, the speed of the gear mechanism 92 is controlled using a paddle wheel.
[0182] As illustrated in FIG. 23, in a chemical solution pump 150 of the present embodiment, the speed control mechanism 151 includes a worm shaft 152 arranged to be rotatable about an eighth axis O8, a paddle wheel 153 rotating about the eighth axis 08 in combination. with the rotation of the worm shaft 152 and applying a rotational resistance to the rotation of the worm shaft 152, and a worm wheel 154 rotating about a ninth axis 09 in association with the rotation of the intermediate wheel 111 and by rotating the worm shaft 152.
[0183] The worm shaft 152 is disposed on the front side of the intermediate wheel 111, and is disposed on the upper surface of the base plate 20 so that the eighth axis O8 is parallel to the right-left direction L3. The two end portions of the worm shaft 152 are pivotally supported by a pair of bearing bases 155 fixed to the base plate 20. In this way, the worm shaft 152 can rotate stably. around the eighth axis O8 with less clicking noise. A spiral worm groove 152a is formed on the outer peripheral surface of the worm shaft 152 along its entire length.
[0184] The impeller 153 is integrally combined with the worm shaft 152, and comprises a pair of vane plates 153a. Therefore, the impeller 153 rotates while receiving the resistance of the air from the impeller 153 in association with the rotation of the worm shaft 152. In this way, the impeller 153 can apply resistance to. the rotation with respect to the rotation of the worm shaft 152. The number of vane plates 153a is not limited to a single pair. The number can be one or three or more.
[0185] The worm wheel 154 is disposed in place of the escape wheel 112 in the first embodiment, and is disposed on the upper surface of the base plate 20 in the state that the ninth axis O9 is parallel. to the ascending-descending direction L1. The worm wheel 154 includes a worm gear (not shown) which meshes with the intermediate gear 111b, and a worm gear 154a which meshes with the worm groove 152a. In this way, the worm wheel 154 can rotate around the ninth axis O9 in association with the rotation of the intermediate wheel 111, and can rotate the worm shaft 152 around the eighth axis O8.
Operation of the chemical solution pump
[0186] The chemical solution pump 150 of the present embodiment configured as described above can also achieve operational effects like those of the first embodiment.
[0187] In particular, when the driving wheel 101 is rotated by the energy generated by the operation of unwinding the mainspring 91, the intermediate wheel 111 and the worm wheel 154 can be rotated in association with them. this. Therefore, the worm shaft 152 can be rotated in association with the rotation of the worm wheel 154, and the paddle wheel 153 can be rotated. The impeller 153 receives an air resistance corresponding to the rotational speed of the worm shaft 152 via the vane plate 153a. Accordingly, the rotational speed of the worm shaft 152 can be controlled at a constant speed, for example.
[0188] In this way, even in the case of the present embodiment, the speed of the cog mechanism 92 can be controlled by using the air resistance of the impeller 153, and the energy generated by the operation. of unwinding of the mainspring 91 is used so that the feed wheel 100 and the nut member 90 can be rotated about the first axis O1 at a predetermined rotational speed. Therefore, the feed screw 60 can be moved forward at a predetermined speed, and operational effects identical to those of the first embodiment can be obtained.
[0189] In addition, in the case of the first embodiment, a configuration is adopted so that the impulse pin 114 of the sprung balance 122 and the anchor 113 collide when the speed of the gear mechanism 92 is controlled. As a result, a collision sound is generated. On the contrary, in the case of the present embodiment, the impeller 153 rotates only. As a result, only a so-called wind noise is generated, and the generated sound can be reduced compared to the collision sound in the first embodiment. Therefore, it is possible to provide the chemical solution pump 150 which is extremely quiet.
Example of modification of the third embodiment
[0190] In the third embodiment described above, the impeller 153 may be configured to rotate in a viscous fluid such as silicone oil having a predetermined viscosity, for example. In this case, the impeller 153 can function as a so-called oil impeller, and can generate the rotational resistance (viscous resistance) corresponding to the rotational speed of the worm shaft 152. , even in this case, it is possible to achieve the same operational effects as when air resistance is used.
Fourth embodiment
[0191] Next, a fourth embodiment of a quantitative quantity supply mechanism according to the aspect of the present invention will be described with reference to the drawings. In the fourth embodiment, the same reference numbers will be assigned to the identical configuration elements as the configuration elements in the first embodiment, and their description will be omitted.
[0192] In the first embodiment, the speed control mechanism 93 controls the speed of the cog mechanism 92 using the escapement 110 having the escape wheel 112 and the anchor 113 and the speed controller 120 having the spring balance 122. However, in the present embodiment, the speed of the cog mechanism is controlled using a paddle wheel. Further, a switching mechanism is provided which switches between stopping and starting the transmission of energy to the nut member 90 so that the rotation of the impeller is controlled using the generated energy. in conjunction with the switching spring unwinding operation.
[0193] As illustrated in FIGS. 24-28, in a pump for chemical solution (quantitative quantity supply mechanism according to the present invention) 200 of the present embodiment, a supply mechanism 201 comprises a mainspring (driving source according to the present invention) 210 which generates the power. power to rotate the nut member 90, a gear mechanism 202 which transmits energy from the mainspring 210 to the nut member 90, and a speed control mechanism 203 which controls the speed of the gear mechanism 202 .
[0194] The cog mechanism 202 has a transmission wheel 211 which rotates around a tenth axis O10 using the energy of the mainspring 210 and meshes with the feed wheel 100.
[0195] The mainspring 210 is housed in a box-shaped housing part 213 fixed to a fixing plate 212 integral with the second support part 80. As in the mainspring 91 in the first embodiment, the mainspring 210 is equivalent to the one used in the mechanical timepiece, is formed into a spiral shape and can generate power by the unwinding operation.
[0196] An outer end part of the mainspring 210 is fixed inside the housing part 213, and an inner end part thereof is locked to the drive shaft part 214 penetrating into the shaft. housing part 213 in the front-rear direction. The drive shaft portion 214 is disposed coaxially with the tenth axis O10. In this way, the drive shaft part 214 can rotate about the tenth axis O10 by the unwinding operation of the mainspring 210.
[0197] The transmission wheel 211 is disposed on the front side of the housing part 213, and is fixed to a connection shaft part 215 disposed coaxially with the tenth axis O10. The connection shaft part 215 is connected to the drive shaft part 214 inside the housing part 213. In this way, the transmission wheel 211 can be rotated about the tenth axis O10 via the part d. The drive shaft 214 and the connecting shaft portion 215 by the energy generated in association with the unwinding operation of the mainspring 210, and the feed wheel 100 and the nut member 90 can be rotated around the first. axis.
[0198] In the present embodiment, the nut member 90 is disposed between the first support portion 70 and the feed wheel 100.
[0199] The rear end part side projecting rearwardly from the housing part 213 in the drive shaft part 214 is rotated. In this way, the mainspring 210 can be wound to reduce the diameter. In this case, the connection shaft part 215 is coaxial with the drive shaft part 214. Accordingly, the connection shaft part 215 can also be rotated when it is wound up by the shaft part. drive 214, and piston 12 can return in the direction opposite to the driving direction.
[0200] The speed control mechanism 203 comprises a first intermediate wheel 220 disposed above the housing portion 213 and rotating about the axis parallel to the up-down direction in association with the rotation of the shaft portion. drive 214, a second intermediate wheel 221 rotating in association with the rotation of the first intermediate wheel 220, a third intermediate wheel 223 rotating in association with the rotation of the second intermediate wheel 221, a worm shaft 224 rotating about an eleventh axis O11 parallel to the forward-backward direction in association with the rotation of the third intermediate wheel 223, and a wheel 225 rotating around the eleventh axis 011 in association with the rotation of the worm shaft 224 and applying a rotational resistance to the rotation of the worm shaft 224.
[0201] The first intermediate wheel 220 meshes with the drive shaft portion 214 via a bevel wheel (not shown). In this way, the first intermediate wheel 220 can rotate about an axis orthogonal to the tenth axis O10. A clutch mechanism (not shown) is provided between the first intermediate wheel 220 and the drive shaft portion 214. In the clutch mechanism, when the drive shaft portion 214 rotates in a winding direction of the mainspring 210, the drive shaft portion 214 is idle relative to the first intermediate wheel 220. When the drive shaft portion 214 rotates in conjunction with the unwinding operation of the mainspring 210, the portion drive shaft 214 and the first intermediate wheel 220 rotate together. In this way, the first intermediate wheel 220 can only rotate when the mainspring 210 is unwound.
[0202] The second intermediate wheel 221 comprises a second intermediate gear 221a which meshes with the first intermediate wheel 220, and a second intermediate gear 221b. The third intermediate wheel 223 comprises a third intermediate gear 223a which meshes with the second intermediate gear 221b, and a third intermediate gear 223b which meshes with the worm shaft 224. The second intermediate wheel 221 and the third intermediate wheel 223 are supported by the fixing plate 212 via a connecting piece (not shown).
[0203] The front end portion of the worm shaft 224 is pivotally supported for rotation by the mounting plate 212, and the rear end portion is pivotally supported for rotation by a workpiece. connection 226 attached to the fixing plate 212. A spiral worm groove is formed along the entire length on the outer peripheral surface of the worm shaft 224. The third intermediate gear 223b described above meshes with the worm groove. In Fig. 26, the connection piece 226 is omitted from the illustration.
[0204] The paddle wheel 225 is integrally combined with the worm shaft 224, and includes a pair of paddle plates 225a. Therefore, the impeller 225 rotates while receiving the air resistance generated by the vane plate 225a in association with the rotation of the worm shaft 224. In this way, the impeller 225 can apply a pressure. rotational resistance to the rotation of the worm shaft 224. The number of vane plates 225a is not limited to a pair. The number can be one or three or more.
[0205] In particular, the paddle wheel 225 receives the air resistance corresponding to the speed of rotation of the worm shaft 224 via the paddle plate 225a. As a result, it is possible to control the speed of the entire train wheel mechanism 202.
[0206] Further, the feed mechanism 201 of the present embodiment includes a switching mechanism 230 which switches between stopping and starting the transmission of energy from the mainspring 210 to the nut member 90.
[0207] The switching mechanism 230 comprises a mainspring (switching spring according to the present invention) 231 which generates switching energy by the unwinding operation, and a movable pin (movable element according to the present invention) 232 which moves between a separation position P3 (see 24) separated from the paddle wheel 225 by switching energy and a stop position P4 (see figure 24) which comes into contact with the wheel 225 to stop the rotation of the paddle wheel 225.
[0208] The mainspring 231 is housed inside a box-shaped housing portion 233 fixed to the base plate 20. As in the mainspring 91 in the first embodiment, the mainspring 231 is equivalent to that used. in the mechanical timepiece, is formed into a spiral shape, and can generate the switching energy by the unwinding operation.
[0209] The outer end part of the mainspring 231 is fixed inside the housing part 233, and the inner end part is locked to a drive shaft part (not shown) entering the shaft. housing portion 233in the ascending-descending direction. The drive shaft part is disposed coaxially with a twelfth axis line 012. In this way, the drive shaft part can be rotated about the twelfth axis O12 by the spring unwinding operation. engine 231.
[0210] In the base plate 20, an opening portion (not shown) which receives the lower end portion of the drive shaft portion is formed in the portion below the housing portion 233. Then , the lower end portion of the drive shaft portion located inside the opening portion so that the mainspring 231 can be wound to reduce the diameter.
[0211] In the drive shaft part, the connection shaft part 235 protruding upward from the housing part 233 is disposed coaxially with the twelfth axis 012. The connection shaft part 235 is connected with the drive shaft part inside the housing part 233. In this way, the drive shaft part and the connection shaft part 235 can be rotated around the twelfth axis 012 by energy. generated in association with the unwinding operation of the mainspring 231. A connection gear 216 is attached to the connection shaft portion 235.
[0212] A first intermediate wheel 240 rotating about the axis parallel to the right-left direction in association with the rotation of the drive shaft part is arranged between the housing part 233 and the movable housing 31. The first wheel intermediate 240 is pivotally supported by connection piece 241 fixed to base plate 20.
[0213] The first intermediate wheel 240 engages with the drive shaft portion via a bevel wheel (not shown). In this way, the first intermediate wheel 240 can rotate about the axis orthogonal to the twelfth axis 012. A clutch mechanism (not shown) is provided between the first intermediate wheel 240 and the drive shaft portion. In the clutch mechanism, when the drive shaft portion is rotated in the winding direction of the mainspring 231, the drive shaft portion is idle relative to the first intermediate wheel 240. When the drive shaft portion is rotated in association with an unwinding operation of the mainspring 231, the drive shaft portion and the first intermediate wheel 240 rotate together. In this way, the first intermediate wheel 240 can only rotate when the mainspring 231 is unwound.
[0214] In addition, the base plate 20 comprises a second intermediate wheel 242 rotating in association with the rotation of the first intermediate wheel 240, a third intermediate wheel 243 rotating in association with the rotation of the second intermediate wheel 242, a worm shaft without end 244 rotating around a thirteenth axis O13 parallel to the ascending-descending direction in association with the rotation of the third intermediate wheel 223, and a paddle wheel 245 rotating around the thirteenth axis O13 in association with the rotation of the worm shaft 244 and applying the rotational resistance to the rotation of the worm shaft 244.
[0215] The second intermediate wheel 242 comprises a second intermediate gear 242a which meshes with the first intermediate wheel 240, and a second intermediate gear 242b. The third intermediate wheel 243 includes a third intermediate gear 243a which meshes with the second intermediate gear 242b, and a third intermediate gear 243b which meshes with the worm shaft 244. The second intermediate wheel 242 and the third intermediate wheel 243 are supported on the base plate 20 via a connecting piece (not shown).
[0216] The lower end portion of the worm shaft 244 is pivotally supported for rotation by the base plate 20, and the upper end portion is pivotally supported for rotation by the workpiece. connection 246 attached to the base plate 20. A spiral worm groove is formed along the entire length on the outer peripheral surface of the worm shaft 244. The third intermediate gear 243b described above meshes with the worm groove.
[0217] The impeller 245 is integrally combined with the worm shaft 244 and includes a pair of vane plates 245a. Therefore, the impeller 245 rotates while receiving the air resistance of the vane plate 245a in association with the rotation of the worm shaft 244. In this way, the impeller 245 can apply the pressure. rotational resistance to rotation of the worm shaft 244. The number of vane plates 245a is not limited to a pair. The number can be one or three or more.
[0218] In particular, the impeller 245 receives the air resistance corresponding to the speed of rotation of the worm shaft 244 via the vane plate 245a. As a result, the speed of the connecting gear 216 can be controlled.
[0219] A cam gear 250 pivotally supported by the base plate 20 meshes with the connection gear 216. The cam gear 250 includes a connection target gear 251 capable of rotating about a fourteenth axis O14 parallel to the upward direction. descending and meshing with connection gear 216, and a cam plate 252 integrally formed with connection target gear 251.
[0220] Therefore, the cam gear 250 is rotated by the energy generated in association with the unwinding operation of the mainspring 231, and can be rotated in association with the rotation of the connecting gear. 216 whose speed of rotation is controlled by the paddle wheel 245.
[0221] The cam plate 252 has a disc shape in which two outer peripheral parts having different outer diameters, i.e. a first outer peripheral part 252a and a second outer peripheral part 252b are connected to each other. the other in the circumferential direction. In the example illustrated, the outer diameter of the first outer peripheral part 252a is formed to be larger than that of the second outer peripheral part 252b. The length of the first outer peripheral part 252a in the circumferential direction and the length of the second outer peripheral part 252b in the circumferential direction are equal to each other.
[0222] However, without being limited to this case, the ratio of the length of the first outer peripheral part 252a in the circumferential direction to the length of the second outer peripheral part 252b in the circumferential direction can be changed as appropriate.
[0223] The movable pin 232 is inserted into a through hole 212a penetrating into the fixing plate 212 in the front-rear direction to be slidable in the front-rear direction L2. In this case, the movable pin 232 is disposed such that the front end portion is located behind the cam plate 252, and the rear end portion is located in front of the vane plate 225a in the wheel 225. The surface d The front end and the rear end of the movable pin 232 surface are both planar surfaces.
[0224] The movable pin 232est always biased rearwardly (towards the side of the cam plate 252) by a biasing element such as a coil spring (not shown). Therefore, the front end part of the movable pin 232 comes into contact with the first outer peripheral part 252a or the second outer peripheral part 252b in the cam plate 252 from the rear.
[0225] When the front end portion of the movable pin 232 is in contact with the first outer peripheral portion 252a having a large outer diameter, the rear end portion contacts the paddle wheel 225 from the front. When the front end part contacts the second outer peripheral part 252b having a small outer diameter, the rear end part is separated from the impeller 225.
[0226] Therefore, the position in which the front end portion of the movable pin 232 comes into contact with the first outer peripheral portion 252a is the stop position P4 described above, and the position in which the portion of front end of the movable pin 232 coming into contact with the second outer peripheral portion 252b is the separation position P3 described above.
Operation of the chemical solution pump
[0227] According to the pump for chemical solution 200du present embodiment configured as described above, one can also obtain operational effects identical to those of the first embodiment.
[0228] Further, in the case of the present embodiment, the speed control mechanism 203 and the switching mechanism 230 include the mainsprings 210 and 231. Therefore, only wind noise is generated as in the second embodiment. , and it is possible to provide a pump for chemical solution 200 which is extremely silent.
[0229] In addition, the switching mechanism 230 is provided. Accordingly, it is possible to adjust the discharge time or the discharge time of the chemical solution W from the syringe 10. Accordingly, it is possible to provide the chemical solution pump 200 which realizes convenient operation and can be used. in various ways corresponding to various purposes. In addition, the switching mechanism 230 is operated by using the energy of the mainspring 231. Therefore, the electric energy is not required. Therefore, the discharge time of the chemical solution W can be controlled without using the electric power, and it is possible to provide the chemical solution pump 200, which enables extremely convenient use.
This configuration will be described in detail.
[0230] As illustrated in FIG. 28, when the front end part of the movable pin 232 is in contact with the first outer peripheral part 252a in the cam plate 252, the movable pin 232 is located at the stop position P4. As a result, the rear end portion of the movable pin 232 is in contact with the paddle wheel 225. Therefore, the paddle wheel 225 can be stopped, and in association with it, the entire gear mechanism 202 (first intermediate wheel 220, second intermediate wheel 221, and the third intermediate wheel 223) can be stopped. Therefore, the transmission wheel 211 (cog mechanism 202) can be stopped, and the feed wheel 100 and the nut member 90 can be kept in a stopped state. Therefore, the movement of the piston 12 can be stopped, and the discharge operation of the chemical solution W can be kept in a stopped state.
[0231] On the other hand, the connection gear 216in the switching mechanism 230 rotates around the twelfth axis O12 by the energy generated in association with the unwinding operation of the mainspring 231. In this case, the speed of the Connection gear 216 is controlled by the rotation of impeller 245, and connection gear 216 rotates at a constant rotational speed. Therefore, the cam gear 250 rotates around the twelfth axis O12 at a constant rotational speed in association with the rotation of the connecting gear 216.
[0232] Then, when a part in contact with the front end part of the movable pin 232 is switched from the first outer peripheral part 252a to the second outer peripheral part 252b by the rotation of the cam gear 250, the second outer peripheral part 252b has the outer diameter smaller than that of the first outer peripheral part 252a. As a result, the movable pin 232 moves forward due to a biasing force of a biasing member. In this way, the movable pin 232 is moved to the separation position P3 where the front end part contacts the second outer peripheral part 252b and the rear end part is separated from the impeller 225.
[0233] In this way, the paddle wheel 225du speed control mechanism 203 can be rotated. While the speed of the gear train 202 is controlled, the energy generated in association with the unwinding operation of the mainspring 210 can be transmitted to the feed wheel 100 and the nut member 90 via the transmission wheel 211. As a result, it is possible to move the piston 12 with a constant amount of movement, and the chemical solution W can be discharged.
[0234] Until now, the embodiments of the present invention have been described. However, the embodiments are presented by way of example and are not intended to limit the scope of the invention. The embodiment can be implemented in various other forms. Various omissions, substitutions and modifications can be made within the scope not departing from the concept of the invention. For example, embodiments and examples of modification thereof include those which can be readily assumed by one skilled in the art, and include those which are substantially the same, those which have an equivalent range.
[0235] For example, in the respective embodiments described above, the chemical solution delivery device in which the indwelling needle is provided in the main body housing receiving the pump for chemical solution has been described in as an example. However, the present invention is not limited to this case. For example, the chemical solution delivery device can be provided as follows. A patch part including the indwelling needle can be provided separately from the main body case, and the main body case and the patch part can be connected to each other by a flexible tube.
[0236] Further, in the respective embodiments described above, a configuration is adopted so that the feed screw is connected in series with the piston via the movable housing. However, the present invention is not limited to this case. For example, a configuration can be adopted so that the movable housing and the feed screw are connected in parallel with the piston 12. Even so, the same operational effects can be obtained.
[0237] Further, in the respective embodiments described above, a so-called lead screw method is adopted in which the feed screw is moved forward by the rotation of the nut member. However, the present invention is not limited to this case.
[0238] For example, as illustrated in FIG. 29, an adjustment mechanism 160 may be provided which comprises a rack part (movable body according to the present invention) 161 disposed on the rear side of the movable housing 31 and moving together with the piston 12 via the movable housing 31, and a feed mechanism 162 moving the rack portion 161 forward at a predetermined speed and applying the auxiliary force F2 to the piston 12 via the rack portion 161.
[0239] The feed mechanism 162 comprises a pinion 163 which meshes with rack teeth in the rack portion 161 and a speed control lever 164 which controls the rotational speed of the pinion 163.
[0240] In this case, the adjustment mechanism 160 can be configured to adopt a so-called rack and pinion method. Even then, the same operational effects can be achieved. In this case, the meshing force between the pinion 163 and the rack teeth can be used as the reaction force F3. Therefore, the pinion 163 and the rack portion 161 can function as a braking unit 165.
[0241] In addition, as illustrated in FIG. 30, an adjustment mechanism 170 may be provided which comprises a movable rod (movable body according to the present invention) 171 disposed on the rear side of the movable housing 31 and moving together with the piston 12 via the movable housing 31, and a feed mechanism 172 moving the movable rod 171forward at a predetermined speed and applying the auxiliary force F2 to the piston 12 via the movable rod 171.
[0242] The feed mechanism 172 comprises an eccentric cam 173 which presses the movable rod 171 rotating about the axis of rotation, and a speed control unit 174 which rotates the eccentric cam 173 and controls the speed of rotation.
[0243] In this case, the adjustment mechanism 170 can be configured to adopt a so-called cam method, and the same effect can be obtained. In this case, the frictional force between the movable rod 171 and the peripheral surface of the eccentric cam 173 can be used as the reaction force F3. Therefore, the movable rod 171 and the eccentric cam 173 can function as the brake unit 175.
[0244] In addition, instead of the eccentric cam 173, for example, a cam inclined with respect to the axis of rotation can be used to press the movable rod 171 by the rotation of the inclined cam, or the movable rod can be used. be pressed by the lever tilted around the axis of rotation.
[0245] In addition, as illustrated in FIG. 31, an adjustment mechanism 180 may be provided which comprises a movable rod (movable body according to the present invention) 181 which is disposed on the rear side of the movable housing 31 and moves together with the piston 12 via the movable housing 31, and a mechanism of movement. feed 182 moving the movable rod 181 forward at a predetermined speed and applying the auxiliary force F2 to the piston 12 via the movable rod 181.
[0246] The feed mechanism 182est connected to the movable rod 181via a connecting rod 183, and comprises a turntable 184which rotates around the axis of rotation.
[0247] In this case, the adjustment mechanism 180 can be configured by a so-called gear system, and the same effect can be obtained. In this case, for example, the resistance to rotation of the turntable 184 can be used as the reaction force F3.
[0248] In addition, as illustrated in FIG. 32, an adjustment mechanism 190 may be provided which comprises a movable rod (movable body according to the present invention) 191 which is disposed on the rear side of the movable case 31 and moves together with the piston 12 via the movable case 31, and a mechanism of movement. The feed 192 moves the movable rod 191 forward at a predetermined speed and applies the auxiliary force F2 to the piston 12 via the movable rod 191.
[0249] The feed mechanism 192 comprises a drive belt 195 wound around the first roller 193 and the second roller 194 and moved at a predetermined speed by the rotation of the two rollers 193 and 194, and a moving part 196 provided in the drive belt 195 and. moving the movable rod 191 associated with the movement of the drive belt 195.
[0250] In this case, the adjustment mechanism 190 can be configured by a so-called belt drive system, and the same operational effects can be obtained. In this case, a frictional force between the first roller 193 and the second roller 194 and the drive belt 195 can be used as the reaction force F3. Therefore, the first roller 193, the second roller 194, and the drive belt 195 can function as a brake unit 197.
[0251] As described above, examples of the adjustment mechanism for adjusting the movement of the piston have been described with reference to Figs. 29 to 32. However, the present invention is not limited to these cases, and can be modified if necessary.
[0252] Further, in the respective embodiments described above, a case in which the piston is pressed using the elastic restoring force of the spiral spring as the driving force has been described by way of example. However, the case is not limited to the spiral spring. For example, the elastic return force of various spring elements other than spiral springs such as leaf spring, coil spring, torsion spring, disc spring, and scroll spring can be used as the force. training.
[0253] Further, without being limited to the spring elements, the driving force can be generated using a compressed fluid such as a compressed gas or a compressed liquid. The driving force can be generated by using the stretching and shrinking property of the shape memory alloy wire. Alternatively, the driving force can be generated using a repulsive force based on a magnetic force.
[0254] Further, in the second embodiment described above, the oscillation of the oscillator plate which is generated by the stretching and shrinking property of the first shape memory alloy wire and the second Shape memory alloy wire is used to switch between stopping and starting the power transmission from the mainspring to the nut member. However, the present invention is not limited to this case. For example, a configuration can be adopted so that energy begins to be transmitted using a gear meshing operation.
[0255] For example, in an intermediate part of a transmission path for transmitting the energy of the mainspring to the nut element, there may be provided a switching mechanism comprising an oscillating wheel rotating as a function of the energy transmitted by the mainspring, a driven wheel which transmits energy from the swing wheel side to the nut member side when the swing wheel meshes with the driven wheel, and a swing lever which meshes with the driven wheel by causing the oscillation wheel to oscillate after a predetermined period of time.
[0256] In this case, for example, even when the driving wheel begins to be rotated by the energy of the mainspring, in a step prior to the expiration of the predetermined time, it is possible to prevent the transmission of energy to the nut element. Then, when the predetermined time elapses and it is a required timing for the administration of the chemical solution, the oscillation lever oscillates the oscillation wheel to mesh with the driven wheel. . In this way, the energy of the mainspring can be transmitted to the nut member via the oscillating wheel and the driven wheel, and the administration of the chemical solution can begin.
[0257] Therefore, operational effects identical to those of the second embodiment can be obtained. In particular, in one case of this configuration, unlike the second embodiment, the electrical energy to power the shape memory alloy wire is not necessary. Therefore, the timing of administration of the chemical solution can be controlled without using electric power.
[0258] Although preferred embodiments of the invention have been described and illustrated above, it should be understood that these are examples of the invention and should not be considered as limiting. Additions, omissions, substitutions and other modifications can be made without departing from the spirit or scope of the present invention. Accordingly, the invention is not to be construed as being limited by the foregoing description, and is limited only by the scope of the appended claims.
List of reference signs
[0259] F1: driving force F2: auxiliary force F3: reaction force P3: separation position P4: stop position O1: first axis (axis) S: body surface (living body surface) W: solution chemical 1: chemical solution administration device 2, 130, 150, 200: pump for chemical solution 3: main housing 4: indwelling needle 10: syringe 12: plunger 21: holding member 22: motor unit 23, 160, 170, 180, 190: adjustment mechanism 30: spiral spring (spring element) 60: feed screw (movable body) 61, 162, 172, 182, 192, 201: feed mechanism 63, 165, 175, 187, 197: braking unit 90: nut element 91, 210: mainspring (drive source) 92, 202: cog mechanism 93, 151, 203: speed control mechanism 131, 230: mechanism switch 161: rack part (movable body) 171, 181, 191: movable rod (movable body) 225: paddle wheel 231: mainspring (switching mainspring) 232: movable pin (element nt mobile)

权利要求:
Claims (8)
[1]
1. A pump for chemical solution comprising:a holding member which contains a syringe filled with a chemical solution and discharging the chemical solution in association with movement of a plunger arranged to be slidably movable within the syringe;a drive unit which presses the plunger with a predetermined drive force to move the plunger in a first direction towards the interior of the syringe; andan adjustment mechanism that adjusts the movement of the piston so that the piston moves with the driving force,wherein the adjustment mechanism applies an auxiliary force to the piston in a direction identical to the first direction, or applies a reaction force to the piston in a second direction opposite to the first direction, according to the difference between a generated resistance force by the movement of the plunger inside the syringe and the driving force.
[2]
2. A chemical solution pump according to claim 1, wherein the adjustment mechanism comprises:a movable body arranged to be movable along an axis in connection with the piston,a feed mechanism which moves the movable body in the first direction at a predetermined speed, and applies the auxiliary force to the piston via the movable body, anda braking unit which applies the reaction force to the piston in the second direction via the movable body.
[3]
The chemical solution pump according to claim 2, wherein the movable body has a feed screw having a male screw portion formed on an outer peripheral surface, and disposed in a state that the rotation around the axis is. restraint,the feed mechanism comprising:a nut member which has a female screw part screwed onto the male screw part, and which is screwed onto the feed screw,a drive source which generates energy to rotate the nut member,a gear mechanism which transmits energy from the drive source to the nut member, anda speed control mechanism which controls the speed of the cog mechanism, andthe braking unit uses at least an engaging force in the cog mechanism and an engaging force of the male screw part with respect to the female screw part, as the reaction force.
[4]
The chemical solution pump according to claim 3, wherein the drive source has a mainspring which generates energy by an unwinding operation.
[5]
The chemical solution pump according to claim 4, wherein the feed mechanism comprises a switching mechanism which switches between stopping and starting the transmission of energy from the drive source to the drive element. nut, andthe feed mechanism stops the movement of the feed screw and the piston by stopping the transmission of energy to the nut member, and moves the piston, depending on the driving force, while driving the adjustment mechanism to adjust the movement of the piston by starting the transmission of energy to the nut member.
[6]
The chemical solution pump according to claim 5, wherein the speed control mechanism comprises a paddle wheel which meshes with the cog mechanism, and is rotated by the energy associated with the spring unwinding operation. motor,the paddle wheel generates a resistance corresponding to the rotational speed of the cog mechanism to control the speed of the cog mechanism, andthe switching mechanism includes:a switching mainspring which generates switching energy by an unwinding operation, anda movable member which moves between a position of separate separation of the impeller and a stop position in contact with the impeller to stop the rotation of the impeller, based on the switching energy.
[7]
The chemical solution pump according to any one of claims 1 to 6, wherein the drive unit comprises a spring member which generates the drive force by using an elastic restoring force.
[8]
8. Chemical solution administration device comprising:the chemical solution pump according to any one of claims 1 to 7;a main body housing housing the chemical solution pump therein and mountable to a living body surface; andan indwelling needle capable of penetrating the surface of the living body in a state where the living body is punctured, and in which the chemical solution discharged from the syringe is introduced.

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同族专利:

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公开号 | 公开日

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JP2021122315A|2021-08-30|

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JP6937397B2|2021-09-22|

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CN113198062A|2021-08-03|

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DE102021101193A1|2021-08-05|

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US20210236720A1|2021-08-05|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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JP2011250867A|2010-05-31|2011-12-15|Terumo Corp|Portable chemical pump|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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JP2020015399A|JP6937397B2|2020-01-31|2020-01-31|Chemical solution pump and chemical solution administration device|

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