• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a breath flow sensor (11) with a flow tube (12), which has a flow channel (13) and at its free ends (15, 17) has hose connections for hoses, with an orifice flap (32) which is located in the flow channel (13). is arranged and the flow channel (13) is divided into a first flow channel part (18) and a second flow channel part (19), and with connections (22, 23) which open into the flow channel (13) on both sides of the diaphragm flap (32) and serve to decrease the pressure difference generated by the diaphragm flap (32). A drainage device (41) comprising drain grooves (42, 43) is provided in the flow channel (13). The diaphragm flap (32) has a hinge area which is formed by a first incision and a second, H-shaped incision.
    公开号:CH712850B1
    申请号:CH00005/18
    申请日:2016-07-01
    公开日:2020-03-13
    发明作者:Friberg Harri；Däscher Jakob
    申请人:Imtmedical Ag；
    IPC主号:
    专利说明:

    The invention relates to a breath flow sensor according to the preamble of claim 1 or 9.
    Respiratory flow sensors, also called differential pressure flow sensors, flow sensors or flow sensors, are arranged between a tube originating from a ventilator or anesthesia device and a tube supplied to the patient.
    From US 5 979 247 A a breath flow sensor with a flow tube, with an orifice flap and with connections is known. The flow tube has a cylindrical flow channel and hose connections for the hoses at its free ends. The diaphragm flap is arranged in the flow channel and divides the flow channel into a first flow channel part and into a second flow channel part. Furthermore, the diaphragm flap has a hinge area and a free end area opposite the hinge area. The hinge area is formed by a first incision and a second incision, the second incision being arranged between the first incision. The connections open into the flow channel on both sides of the orifice plate and serve to decrease the pressure difference generated by the orifice plate.
    If air or the patient's breath flows through the respiratory flow sensor, the deflectable diaphragm flap forms a flow resistance. A respiratory flow sensor must have sufficient measurement accuracy for reliable use. In particular in the case of a respiratory flow sensor for children, which has a relatively small diameter of the flow channel, high differential pressures occur in the respiratory flow sensor. Accordingly, even minor influences have a major impact on the result of a measurement that is carried out.
    The patient's breathing air also contains moisture, which is deposited as a liquid during ventilation in the flow channel of the respiratory flow sensor. This liquid can lead to measurement noise on the useful signal and thus cause an inaccurate measurement. The liquid in the breath flow sensor can also lead to the result of this measurement being strongly falsified, since the characteristic of the diaphragm flap changes as a result of a liquid fogging. Furthermore, due to a high liquid level in the flow channel, the freedom of movement or the deflectability of the diaphragm flap can be severely impaired. These effects occur in particular when the liquid collects in an area of the flow channel in which the diaphragm flap is arranged.
    It has now been proposed to arrange the respiratory flow sensor in each case between the tubes so that it comes to lie in an oblique orientation and, due to gravity, the liquid located in the respiratory flow sensor can flow off. However, the patient often moves during the duration of a ventilation process or during anesthesia. Thus, the obliquely arranged respiratory flow sensor may come into a position in which the respiratory flow sensor is no longer dewatered and thus a sufficient measuring accuracy is no longer guaranteed.
    From US 2007 01 313 279 A1 it is known in the case of a breath flow sensor to provide drainage lines projecting vertically outwards on both sides of a stationary flow resistance, each of which can be closed with a valve.
    [0008] This type of drainage is structurally complex and leads to correspondingly high manufacturing costs for the respiratory flow sensor. However, such breath flow sensors are often disposable, so that the manufacturing costs are to be kept as low as possible.
    Due to the hinge area of the diaphragm flap, which comprises two joint areas or hinges spaced apart from one another, the diaphragm flap according to US Pat. However, after a certain period of use, breaks always occur in this hinge area, which can also lead to inaccurate measurement results.
    From DE 19 617 738 C1 a breath flow sensor with a flow tube, with an aperture flap and with connections is known. The flow tube has a flow channel with a rectangular cross section and hose connections for the hoses at its free ends. The diaphragm flap is arranged in the flow channel and divides the flow channel into a first flow channel part and into a second flow channel part. Furthermore, the diaphragm flap has a hinge area and a free end area opposite the hinge area. The hinge area is formed by a first incision and a second incision, the second incision being arranged between the first incision. The connections open into the flow channel on both sides of the orifice plate and serve to decrease the pressure difference generated by the orifice plate.
    Even with a breath flow sensor according to DE 19 617 738 C1, liquid can collect in the flow channel and after a certain period of use there are always breaks in the hinge area of the diaphragm flap.
    From US 4 989 456 A a breath flow sensor is known which has a flow tube which has a flow channel and at its free ends hose connections for hoses, an orifice flap which is arranged in the flow channel and the flow channel in a first flow channel part and in divides a second flow channel part, and has connections which open into the flow channel on both sides of the diaphragm flap and serve to decrease the pressure difference generated by the diaphragm flap. Two ring-shaped receiving spaces are provided in the flow channel as a drainage device for the respiratory flow sensor. Moisture generated in the breath flow sensor is collected in these recording rooms.
    A disadvantage of this known solution is that the moisture that accumulates is still present in the respiratory flow sensor during the entire measurement process, and that falsification of the measurement results due to moisture precipitation can continue to occur. Depending on the orientation of the respiratory flow sensor, liquid located in the receiving space can also escape unintentionally.
    The diaphragm flap of US Pat. No. 4,989,456 A has hinges which are formed by incisions running in opposite directions. This configuration prevents breaks in the hinge areas to a limited extent over a longer period of use.
    [0015] EP 2 275 783 A2 shows a breath flow sensor with an orifice flap, the hinge area of which has a plurality of incisions arranged parallel to one another.
    A disadvantage of this solution is that, due to this configuration of the hinge area, particularly in the case of breathing flow sensors with smaller dimensions, such as are used in ventilation and anesthesia in children, undesirable deflection movements of the diaphragm flap can occur under pressure. This can go so far that the diaphragm flap begins to flutter. If the material thickness of the diaphragm flap is increased in such a way that undesired deflection movements of the diaphragm flap are largely prevented, this makes the measurement itself more difficult.
    The object of the present invention is therefore to provide a breath flow sensor that does not have the aforementioned disadvantages and in particular ensures sufficient measurement accuracy with a long service life.
    [0018] The object is achieved by the features of the independent claims. Advantageous further developments are set out in the figures and in the dependent claims.
    According to a first approach of the invention, a breath flow sensor has a flow tube which has a flow channel and at the free ends of which there are hose connections for hoses, an orifice flap which is arranged in the flow channel and divides the flow channel into a first flow channel part and into a second flow channel part , and connections which open into the flow channel on both sides of the diaphragm flap and serve to decrease the pressure difference generated by the diaphragm flap, a drainage device being provided in the flow channel, which comprises at least one drainage groove.
    [0020] Moisture accumulating in the flow channel, for example, flows off in the at least one drainage channel and / or this can collect in the at least one drainage channel. As an alternative or in addition to draining the liquid, the maximum level of the liquid in the respiratory flow sensor is limited by this form of the dewatering device in the flow channel. The drainage device in the flow channel, which comprises at least one drainage groove, thus ensures that the liquid in the breath flow sensor does not impair the deflection or the movement of the diaphragm flap and thus the liquid in the breath flow sensor does not lead to falsified measurement results.
    Advantageously, the at least one drainage groove extends in the flow direction of the respiratory flow sensor or its flow channel, whereby a cumulative accumulation of liquid in the respiratory flow sensor and in particular in the area of the diaphragm flap is preferably prevented.
    The at least one drainage groove is advantageously channel-shaped and has, for example, a rectangular, U-shaped and / or V-shaped cross section.
    [0023] The drainage device preferably comprises a plurality of drainage channels, so that despite the provision of a sufficiently large volume for holding liquid, the wall of the flow channel is not excessively weakened in the area of the drainage channels.
    [0024] The drainage grooves are advantageously spaced apart from one another in the circumferential direction, so that they are optimally arranged for collection or discharge or discharge of the liquid. Even when the respiratory flow sensor is rotated about its throughflow axis, there is at least one drain groove for collecting or discharging the liquid.
    [0025] The plurality of drainage grooves are preferably arranged along a region of the inner circumference of the flow channel which extends at most over half of the entire inner circumference of the flow channel. In relation to the cross section of the flow channel, the area with the drainage grooves extends over a maximum of 180 ° of a full circle with 360 °. With this arrangement of the plurality of drainage grooves, when the respiratory flow sensor is rotated about its throughflow axis in the usual application, there is always at least one drainage groove for collecting or draining the liquid.
    The distances between the plurality of drainage grooves are preferably different from one another along the region of the inner circumference, which enables an advantageous collection or removal of the liquid in the breath flow sensor.
    The angular range of the outermost drainage grooves to the drainage grooves adjacent to them is advantageously greater than that of the inner drainage grooves to one another. The respiratory flow sensor usually only rotates around the flow axis over a small angular range during ventilation or during anesthesia. As a result of the closer arrangement of the inner drainage channels to one another, a sufficiently large volume is available for absorbing or discharging the liquid when the respiratory flow sensor is used normally and in relation to gravity.
    Preferably, the at least one drainage groove extends from the diaphragm flap in a direction of the corresponding free end of the flow tube along an arc line, so that gravity provides an advantageous discharge or discharge of the liquid. Alternatively, the at least one drainage groove extends from the diaphragm flap in a direction of the corresponding free end of the flow tube along a slope that is arranged at an angle to the throughflow axis of the flow channel.
    [0029] At least one flow channel section preferably runs in an arcuate manner in the area of the dewatering device, so that gravity provides an advantageous discharge or discharge of the liquid.
    Preferably, the cross section of at least one flow channel section increases in the area of the drainage device, starting from the diaphragm flap in a direction of the corresponding free end of the flow tube, so that gravity leads to a discharge or discharge of the liquid. The flow channel section advantageously enlarges over its entire circumference, so that the relative position of the respiratory flow sensor in relation to the throughflow axis of the flow channel has no influence.
    Preferably, the enlarging flow channel section is formed in a trumpet shape, which enables simple manufacture with advantageous drainage or discharge of the liquid. Alternatively, the enlarging flow channel section is conical.
    A breath flow sensor is also conceivable, which has a flow tube which has a flow channel and at its free ends hose connections for hoses, an orifice flap which is arranged in the flow channel and divides the flow channel into a first flow channel part and into a second flow channel part, wherein the diaphragm flap has a hinge region and a free end region opposite the hinge region, and has connections which open into the flow channel on both sides of the diaphragm flap and serve to decrease the pressure difference generated by the diaphragm flap, at least one stop section for the free end region of the diaphragm flap in the flow channel is provided to limit the deflection of the diaphragm flap.
    The at least one stop section limits the maximum deflection of the diaphragm flap, so that this and thus the breath flow sensor has a higher usability than the solutions known from the relevant prior art.
    A drainage device for the liquid accumulating in the respiratory flow sensor is advantageously provided in the stop section, e.g. in the form of at least one trough or collecting trough.
    Further advantageously, two opposing stop sections are provided in the flow channel to limit the deflection of the diaphragm flap in both directions, which further improves the usability of the breath flow sensor, since the diaphragm flap can only pivot over the area defined by the distance between the stop sections.
    A drainage device for the liquid accumulating in the respiratory flow sensor is advantageously provided between the two stop sections, e.g. in the form of a collecting pan.
    According to a further approach of the invention, a breath flow sensor has a flow tube which has a flow channel and at the free ends of which there are hose connections for hoses, an orifice flap which is arranged in the flow channel and divides the flow channel into a first flow channel part and into a second flow channel part , wherein the diaphragm flap has a hinge area which is formed by a first incision and at least a second incision, and connections which open on both sides of the diaphragm flap into the flow channel and serve to decrease the pressure difference generated by the diaphragm flap, the at least one second incision of the hinge area of the diaphragm flap is H-shaped and a respective side incision is provided adjacent to the at least one second incision.
    This configuration of the incisions not only prevents a torsional movement of the diaphragm flap at high respiratory flows, but also ensures a high level of security against the diaphragm flap breaking in its hinge area. This respiratory flow sensor according to the invention thus has a long usability with high measuring accuracy. The diaphragm flap advantageously has a polygonal and / or axially symmetrical cross section.
    Preferably, the ends of at least one second incision have bevels or radii, with which voltage peaks when deflecting the diaphragm flap are reduced in these areas of the incisions and thus the usability of the diaphragm flap and thus the entire respiratory flow sensor is improved. All ends of the incisions in the diaphragm flap are advantageously provided with bevels or radii.
    Further advantages, features and details of the invention will become apparent from the following description in which exemplary embodiments of the invention are described with reference to the drawings.
    Like the technical content of the claims and figures, the list of reference symbols is part of the disclosure. The figures are described coherently and comprehensively. The same reference symbols mean the same components, reference symbols with different indices indicate functionally identical or similar components.
    It shows:<tb> Fig. 1 <SEP> a respiratory flow sensor according to the invention in a perspective view,<tb> Fig. 2 <SEP> the respiratory flow sensor according to FIG. 1 in an exploded view,<tb> Fig. 3 <SEP> a schematic longitudinal section through a respiratory flow sensor according to the invention,<tb> Fig. 4A-B <SEP> in each case the cross-section of the respiratory flow sensor according to FIG. 3,<tb> Fig. 5 <SEP> a schematic longitudinal section through a variant of the respiratory flow sensor according to FIG. 3,<tb> Fig. 6 <SEP> a schematic longitudinal section through a further variant of the respiratory flow sensor according to FIG. 3,<tb> Fig. 7 <SEP> a respiratory flow sensor in a detail section,<tb> Fig. 8 <SEP> the diaphragm flap of a respiratory flow sensor according to FIG. 1 in a view, and<tb> Fig. 9 <SEP> the hinge of the diaphragm flap according to FIG. 8 in a detailed view.
    The respiratory flow sensor 11 shown in FIGS. 1 and 2 has a flow tube 12, an orifice flap 32 and connections 22 and 23. The cylindrical flow tube 12 has a flow channel 13 and 15 or 17 hose connections for hoses at its free ends.
    The flow tube 12 is formed in two parts (flow tube part 14 and flow tube part 16), the diaphragm flap 32 being arranged between the flow tube parts 14 and 16 in the flow channel 13. The diaphragm flap 32 divides the flow duct 13 into a first flow duct part 18 and a second flow duct part 19. In the area in which the diaphragm flap 32 comes to rest when the flow pipe parts 14 and 16 are brought together, the flow pipe parts 14 and 16 each have a larger flow rate. Cross section on.
    The connection 22 opens into the flow channel 13 in the first flow channel part 18 and the connection 23 opens into the flow channel 13 in the second flow channel part 19. The connections 22 and 23 thus open on both sides of the diaphragm flap 32 in the flow channel 13 and are used for removal the pressure difference generated by the orifice flap 32.
    A drainage device 41 is provided in the flow channel 13.
    3 and 4A to 4D schematically simplified representation, the drainage device 41 comprises a plurality of drainage grooves 42 and 43, which are arranged circumferentially spaced from each other. The liquid 46 accumulating in the respiratory flow sensor 11 is collected in the drainage grooves 42 and 43 and, if necessary, discharged into these. The drain grooves 42 and 43 are designed such that the movement of the diaphragm flap 32 is not affected by this.
    The drain grooves 42 and 43 are arranged along a region of the inner circumference of the flow channel 13, which extends over half of the entire inner circumference of the flow channel 13 (see FIG. 4A; 2xα + β). The distance (angular dimension α) of the drain grooves 42 to the drain grooves 43 is greater than the distance (angular dimension β) of the drain grooves 43 from one another. Such an arrangement of the drain grooves 42 and 43 ensures that the dewatering device 41 also achieves sufficient measurement accuracy with the respiratory flow sensor 11 when it is rotated in regions around its flow axis 20 (see FIGS. 4A to 4D). The throughflow axis 20 corresponds to the central axis of the flow channel 13.
    Individual or all drainage grooves 42 and / or 43 can proceed from the diaphragm flap 32 in a direction of the corresponding free end 15 or 17 of the flow tube 12 along an arc line. Alternatively, individual or all drainage grooves 42 and / or 43, starting from the diaphragm flap 32, can run in a direction of the corresponding free end 15 or 17 of the flow tube 12 along a slope which is arranged at an angle to the throughflow axis 20 of the flow channel 13.
    In the embodiment shown schematically in simplified form in FIG. 5, the flow channel sections 62 and 63 each run in an arc shape in the area of the drainage device 61 of the respiratory flow sensor 51. The flow channel 53 also runs in an arc shape in this exemplary embodiment.
    In the exemplary embodiment shown schematically in FIG. 6, the cross sections of the flow channel sections 82 and 83 in the area of the dewatering device 81 of the respiratory flow sensor 71 increase from the orifice flap 92 in a direction of the corresponding free end 75 or 77 of the flow tube 72 The flow channel sections 82 and 83 are each conical. Alternatively, at least one of the flow channel sections 82 or 83 could also have a trumpet shape.
    The breath flow sensor 101 shown only in part in FIG. 7 has a stop section 108 in the flow pipe part 104 and a stop section 110 in the flow pipe part 106, against which the free end region 113 of the diaphragm flap 112 can come into contact. The opposing stop sections 108 and 110 in the flow channel 103 limit the maximum deflection of the diaphragm flap 112 in both directions. As a result, the usability of the respiratory flow sensor is additionally improved, since the diaphragm flap can only pivot over the area defined by the distance between the stop sections.
    Between the stop sections 108 and 110, a drainage device 121 is provided, which is trough-shaped for receiving liquid. At least one such stop section can also be provided in the respiratory flow sensor 11, 51 or 71, the outflow of the resulting liquid advantageously being ensured, for example, by arranging corresponding recesses or incisions in the stop section.
    The diaphragm flap 32 shown in FIGS. 8 and 9 here has a circular and disk-shaped base body with a section 38 which is fixed in the installed state and a movable flap section 39. The flap section 39 is connected to the fixed section 38 via a hinge region 33 and separated from the latter by a first incision 34. The flap section 39 has a free end area 40 opposite the hinge area 33. The hinge area 33 is formed by the first notch 34 and a second notch 36. The second incision 36 is H-shaped, with a side incision 35, in which the first incision 34 opens on both sides, being provided parallel to the flanges 37 of the second incision 36. All ends of the second incision 36 and the side incisions 35 have radii (see FIG. 9). Alternatively, these ends can also have bevels.
    Reference list
    [0055]<tb> 11 <SEP> respiratory flow sensor<tb> 12 <SEP> flow tube<tb> 13 <SEP> flow channel<tb> 14 <SEP> flow tube part<tb> 15 <SEP> free end of 14<tb> 16 <SEP> flow tube part<tb> 17 <SEP> free end of 16<tb> 18 <SEP> 1. Flow channel part<tb> 19 <SEP> 2. Flow channel part<tb> 20 <SEP> throughflow axis<tb> <SEP><tb> 22 <SEP> connection<tb> 23 <SEP> connection<tb> <SEP><tb> 32 <SEP> aperture flap<tb> 33 <SEP> hinge area<tb> 34 <SEP> 1. incision<tb> 35 <SEP> side cut<tb> 36 <SEP> 2. incision<tb> 37 <SEP> flange from 36<tb> 38 <SEP> fixed section of 32<tb> 39 <SEP> flap section from 32<tb> 40 <SEP> free end range from 39<tb> 41 <SEP> drainage system<tb> 42 <SEP> drain groove<tb> 43 <SEP> drain groove<tb> <SEP><tb> α <SEP> angle between 42 and 43<tb> β <SEP> angle between 43 and 43<tb> 51 <SEP> respiratory flow sensor<tb> 53 <SEP> flow channel<tb> <SEP><tb> 61 <SEP> drainage system<tb> 62 <SEP> flow channel section<tb> 63 <SEP> flow channel section<tb> <SEP><tb> 71 <SEP> respiratory flow sensor<tb> 72 <SEP> flow tube<tb> 75 <SEP> free end<tb> 77 <SEP> free end<tb> <SEP><tb> 81 <SEP> drainage system<tb> 82 <SEP> flow channel section<tb> 83 <SEP> flow channel section<tb> <SEP><tb> 92 <SEP> aperture flap<tb> <SEP><tb> 101 <SEP> respiratory flow sensor<tb> 103 <SEP> flow channel<tb> 104 <SEP> flow tube part<tb> 106 <SEP> flow tube part<tb> 108 <SEP> stop section<tb> 110 <SEP> stop section<tb> <SEP><tb> 112 <SEP> aperture flap<tb> 113 <SEP> free end range from 112<tb> <SEP><tb> 121 <SEP> drainage system
    权利要求:
    Claims (10)
    [1]
    1. respiratory flow sensor with a flow tube (12; 72), which has a flow channel (13; 53; 103) and at its free ends (15, 17; 75, 77) hose connections for hoses, with an orifice flap (32; 92; 112 ), which is arranged in the flow channel (13; 53; 103) and divides the flow channel (13; 53; 103) into a first flow channel part (18) and a second flow channel part (19), and with connections (22, 23) which open into the flow channel (13; 53; 103) on both sides of the orifice flap and serve to decrease the pressure difference generated by the orifice flap (32; 92; 112), a drainage device (41; 61; 81; 121) in the Flow channel (13; 53; 103) is provided, characterized in that the drainage device (41) comprises at least one drainage groove (42, 43).
    [2]
    2. Breath flow sensor according to claim 1, characterized in that the drainage device (41) comprises a plurality of drainage grooves (42, 43), the drainage grooves (42, 43) preferably being spaced apart from one another in the circumferential direction.
    [3]
    3. Breath flow sensor according to claim 2, characterized in that the plurality of drainage grooves (42, 43) are arranged along a region of the inner circumference of the flow channel (13) which extends at most over half of the entire inner circumference of the flow channel (13).
    [4]
    4. Breath flow sensor according to claim 2 or 3, characterized in that the distances (α, β) of the plurality of drainage grooves (42, 43) are different from one another along the region of the inner circumference.
    [5]
    5. Breath flow sensor according to one of claims 1 to 4, characterized in that the at least one drain groove starting from the diaphragm flap (32) in a direction of the corresponding free end (15 or 17) of the flow tube (12) along an arc line or a slope runs, which is arranged at an angle to the throughflow axis (20) of the flow channel (13).
    [6]
    6. Respiratory flow sensor according to one of claims 1 to 5, characterized in that in the area of the drainage device (61) at least one flow channel section (62, 63) runs in an arc.
    [7]
    7. breath flow sensor according to one of claims 1 to 5, characterized in that the cross section of at least one flow channel section (82, 83) in the area of the drainage device (81) starting from the diaphragm flap (92) in a direction of the corresponding free end (75 or . 77) of the flow tube (72) is enlarged.
    [8]
    8. Breath flow sensor according to claim 7, characterized in that the enlarging flow channel section (82, 83) is trumpet-shaped or conical.
    [9]
    9. breath flow sensor with a flow tube (12), which has a flow channel (13) and at its free ends (15, 17) hose connections for hoses, with an orifice flap (32) which is arranged in the flow channel (13) and the flow channel (13) divided into a first flow channel part (18) and a second flow channel part (19), the diaphragm flap (32) having a hinge area (33) which is formed by a first cut (34) and at least a second cut (36) and with connections (22, 23) which open into the flow channel (13) on both sides of the diaphragm flap (32) and serve to decrease the pressure difference generated by the diaphragm flap (32), characterized in that the at least one second incision (36) of the hinge area (33) of the diaphragm flap (32) is H-shaped and a respective side incision (35) is provided adjacent to the at least one second incision (36).
    [10]
    10. Breath flow sensor according to claim 9, characterized in that the ends of the at least one second incision (36) have slopes or radii.
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    同族专利:
    公开号 | 公开日
    EP3112818A1|2017-01-04|
    DE112016002985A5|2018-03-15|
    WO2017002091A1|2017-01-05|
    US20180242883A1|2018-08-30|
    US10905357B2|2021-02-02|
    EP3112818B1|2020-02-26|
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    法律状态:
    2019-08-15| PUE| Assignment|Owner name: IMTMEDICAL AG, CH Free format text: FORMER OWNER: IASSET AG, CH |
    2020-10-15| PCAR| Change of the address of the representative|Free format text: NEW ADDRESS: ROTENBODENSTRASSE 12, 9497 TRIESENBERG (LI) |
    优先权:
    申请号 | 申请日 | 专利标题
    EP15174891.0A|EP3112818B1|2015-07-01|2015-07-01|Respiratory flow sensor|
    PCT/IB2016/053977|WO2017002091A1|2015-07-01|2016-07-01|Respiratory flow sensor|
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