 Syringe
专利摘要:
A prefilled syringe is disclosed which comprises a syringe body with a slidable piston defining a compartment therein containing a substance to be injected. An injection needle is arranged for communicating with said compartment through said piston and sleeve means are provided around the needle in slidable relationship with said syringe body. A compression spring is urging the sleeve means in a position in which the same surround the tip of the needle and the syringe body is closed before and after an injection. 公开号:SU1774874A3 申请号:SU884356181 申请日:1988-07-08 公开日:1992-11-07 发明作者:Zhak Verle 申请人:Zhak Verle； IPC主号:
专利说明:
The invention relates to medical equipment, in particular to pre-filled syringes for injection. The purpose of the invention is to increase the safety of use. Figure 1 shows a syringe with an elastic locking element in the initial state; figure 2 is the same, after placing the injection needle in the body of the object; in Fig.Z - the same after the injection; figure 4 is the same after removing the needle from the body of the object; figure 5 - a syringe with a rigid locking element in its original position; figure 6 is the same after placing the needle in the body of the object; Fig.7 is the same after the injection; on Fig - a syringe with a valve in the piston in its original position; figure 9 is the same. after placing the needle in the body of the object; in FIG. 10 - the same, at the initial moment of the injection; 11 is the same. after the injection; in FIG. 12 - the same, after removing the needle from the body of the object. The syringe contains a cylindrical hollow body 1, which is open from one of its ends and closed on the other with the formation of a cavity for medicinal liquid substance. The syringe body 1 preferably consists of a glass tube, but can also be made of any other suitable material, for example metal or synthetic resin. A piston 2 is installed inside the housing 1 for sliding mating with a low coefficient of friction of its outer side wall or sealing means fixed on it relative to the inner wall of the housing 1 while simultaneously ensuring the tightness of the cavity bounded by the housing 1 and the rear end of the piston 2 facing the closed side end face 1. The injection needle 3 with its base is placed in a cylindrical supporting element 4, which keeps the base of the needle 3 coaxial with the housing 1. The channel of the needle 3 communicates with the cavity for the drug substance. The cylindrical sleeve 5, which is open from both ends and the outer diameter of which is slightly smaller than the inner diameter of the housing 1, is installed in the initial state characteristic of storage and shown in FIG. 1 with one of its ends inside the housing 1. The sleeve 5 is protected from movement relative to the housing 1 with the help of a holding fixing means made in the form of a sleeve b made of an elastic material, for example rubber or elastic plastic material. The sleeve b is held by a circular collar made around the open end of the housing 1, and it can be removed for the initial filling of the syringe with a drug substance. The coupling 6 has a protrusion inside for coupling with a peripheral annular groove 7 formed on the outer side surface of the sleeve 5. In the case of the embodiment shown in Fig. 1, the generatrix groove 7 closest to the element 4 is perpendicular to the axis of the sleeve 5, and the other is inclined to it. Safety protective casing 8 covers the front end of the needle 3 and is made in the form of a cylindrical sleeve (sleeve), the outer diameter of which is smaller than the inner diameter of the sleeve 5 and which is closed from one of its ends by a wall forming a cap that is easily pierced by the tip of the needle. The casing is open from its other end located inside the sleeve 5, and has a truncated expanding section 9, which is connected with the purpose of abutment made in the form of a truncated cone of the corresponding shape and size of the saddle 10 at the end of the sleeve 5. A compression spring 11 surrounds the needle 3, with one end of the spring abutting against the support member 4 and the other against the inner surface of section 9 of casing 8 to press section 9 against seat 10 in the positions shown in FIG. 1 and 4. In these positions, the inner cavity of the sleeve 5 is practically impervious to the external atmosphere and in the initial position shown in FIG. 1, the elastic force of the spring 11 is sufficient to prevent the needle 3 from piercing the end wall of the casing 8 under normal conditions before use syringe. The supporting element 4 includes a section located inside the sleeve 5 and attached to it. The edge of this section of the support element 4 is included in the annular groove made in the inner side wall of the sleeve 5. In accordance with this embodiment, the operation of the syringe is as follows. In the first stage, the front end of the casing 8 is brought to the skin of the object to be injected, and pressure is exerted on the body 1. With a certain amount of pressure on the casing 8, this pressure causes retraction into the sleeve 5 and compression of the spring 11, as a result of which the needle 3 pierces the end wall of the casing 8 and begins to penetrate into the body of the object. However, the injection does not start until the coin, until the needle reaches its maximum penetration position, shown in figure 2. In this position, the casing 8 is completely placed inside the sleeve 5, and the spring 11 is fully compressed. When passing the needle between the positions depicted in figures 1 and 2. the needle 3 is perfectly ideally guided in the longitudinal direction on the one hand due to the hole punctured by the tip of the needle in the front wall of the casing 8 and, on the other hand, due to the edge of the portion 9 of the casing 8. freely moved along the inner wall of the sleeve 5. Further pressure on the housing 1 leads to the protrusion of the sleeve 6 coming out of the groove 7, which allows the housing 1 to move forward, while the sleeve 5 slides along the housing 1, and the piston 2 presses in the direction of the bottom of the housing вызывает, which causes injection medicinal substance until then. until the bottom of the body rests against the piston 2, and the sleeve 5 is completely retracted into the housing 1. After the injection is completed and the syringe is pulled back in order to remove the needle from the body of the object, the spring 11 expands and puts pressure on the casing 8, the sleeve 5 remains inside the housing 1, and the inner protrusion of the coupling 6 abuts against the edge made from the seat 10 on the outer surface bushings 5. holding 'thus the last inside the housing 1. In the final position, the section 9 of the casing 8 abuts against the saddle 10, the sleeve 5, and the casing 8 completely covers the tip of the needle 3, which eliminates any danger of accidental puncture. Preferably, the needle support member 4 and the piston 2 are mounted so that they are held together relatively freely, without the piston 2 itself being attached directly to the sleeve 5. Accordingly, the piston 2 can be separated from the support element 4, as well as from the sleeve 5. The piston 2 remains on the bottom of the housing 1 in case you try to remove the sleeve 5 and the needle 3 from the housing 1. Thus, this design makes it very difficult to try to reuse the syringe. In the second embodiment of the syringe depicted in figure 5, the groove 7 is made of a rectangular shape. In this case, the housing 1 and the sleeve 5 are held together by the sleeve 6 during the injection. In addition, the support element 4 is attached to the piston 2, but is freely held inside the sleeve 5. This causes an automatic injection, i.e. as a result of the sole action of the spring 11, when retracting the needle. The action of the syringe according to this second embodiment is as follows. The needle is inserted into the body, and the casing 8 is retracted into the sleeve 5 in a manner similar to that described above, to the position shown in Fig.6. At this moment, the spring 11 is fully compressed, and the elastic force that it exerts becomes greater than the force that holds the support element 4, thus pressing in the direction of the bottom of the housing 1 under the action of the spring 11, moving the piston 2. Using it the volume of the cavity of the housing 1 is reduced, and the liquid is injected through the needle 3 until then, until you reach the position shown in Fig.7. This end position is similar to the position shown in figure 4, except that the sleeve 5 is not retracted into the housing 1, and covers the casing 8. During the injection, the needle 3 is gradually removed, and the injection is thus not carried out at a constant, but at a gradually decreasing depth. This may be preferable due to the diffusion of the drug substance in a larger area. The execution of the syringe shown in Figs. 8-12 is similar to that shown in Fig. 1, except that the valve located in the piston 2 is additionally contained, and this valve is installed in such a way that the needle and the cavity of the housing 1 communicate only during injections. In particular, this valve may comprise a durable ball 12 made of suitable material, for example metal, glass or plastic, and placed inside the piston 2 in a hollow space 13 formed in the piston cavity 14 2. In the initial position shown in Fig. 8, and in the position of the retracted casing 8 shown in Fig. 9, the piston 2 is separated from the support element 4, and the ball 12 is pressed against the seat made in the cavity 14 leading into the hollow space 13 thus sealing this hole as a result of elastic force resulting from the pressure exerted by the inside of the piston opposite the seat. The support element 4 has a back part through which the needle 3 passes. When, under the influence of external force, the inner protrusion of the sleeve 6 is expelled from the groove 7, the housing of the syringe 1 moves forward with the piston 2 until the piston comes into contact with the support element 4 , the back of which enters the cavity 14 and, abutting the ball 12, takes it away from the saddle of the cavity 14. The drug cavity then communicates with the needle channel 3. The end of the back of the supporting element 4 is beveled to leave the non-working end of the needle free. After that, injection is started and continued between the positions depicted in FIG. 10 and 11.
权利要求:
Claims (4) [1] 1. A syringe comprising a hollow body with one closed and another open ends, in which the piston is mounted with the ability to move the piston with the supporting element of the injection needle, the channel of which is connected with the cavity for the medicinal substance of the body, characterized in that, in order to increase safety use, it is equipped with a cylindrical sleeve placed on the open end of the housing with two open ends, the supporting element is connected to the inner side surface of which is secured by a housing and a safety protective casing connected to the lateral outer surface of the sleeve with one behind the covered end and another open end placed in the sleeve with the possibility of movement relative to it, and installed in the sleeve between the support element and the casing by a spring in which the injection needle is placed, having the possibility of piercing a closed end of the casing. [2] 2. The syringe according to claim 1, characterized in that the support element is rigidly connected to the sleeve, on the outer side surface of which an annular groove is made, one of which is the closest to the support element, the generatrix of which is perpendicular to the axis of the sleeve, and the other is inclined to it, while in the groove at least one protrusion of a similar shape is arranged, made on the inner surface of the fixing element, which is an elastic coupling. [3] 3. The syringe according to claim 1, characterized in that the support element is mounted with the possibility of exit from the sleeve, on the outer side surface of which is made an annular groove of rectangular shape, in which at least one protrusion of the same shape is placed, made on the inner surface of the fixing means. [4] 4. A syringe according to claims 1 to 3, characterized in that the piston is made with a through cavity, in which a valve is placed in the form of a ball overlapping this cavity and having the possibility of opening it by means of a support element. • 1774874 9ig6 zzzzzz ^ <> <> ίΖΖΣΖΣΖζί
类似技术:
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同族专利:
公开号 | 公开日 FR2617718A1|1989-01-13| ZA884929B|1989-03-29| ATA179188A|1993-11-15| BE1001078A3|1989-07-04| MY103587A|1993-08-28| NL8801738A|1989-02-01| CN1030529A|1989-01-25| DE3823266C2|1998-12-10| IT8848163D0|1988-07-08| GB2206800A|1989-01-18| US4936830A|1990-06-26| SE8802502D0|1988-07-04| AU1891188A|1989-01-12| GB8816254D0|1988-08-10| CA1295903C|1992-02-18| IN167200B|1990-09-15| SE8802502L|1989-01-11| CH673775A5|1990-04-12| GB2206800B|1991-05-08| DE3823266A1|1989-03-16| IT1235007B|1992-06-16| AU604340B2|1990-12-13| SE467521B|1992-08-03| FR2617718B1|1989-12-22| PH24905A|1990-12-26| CN1026391C|1994-11-02| JP2718704B2|1998-02-25| JPS6470070A|1989-03-15| KR970002586B1|1997-03-06| ES2007957A6|1989-07-01|
引用文献:
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申请号 | 申请日 | 专利标题 CH2635/87A|CH673775A5|1987-07-10|1987-07-10| 相关专利
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