WO2018041069A1 - Disposable flow sensor, mounting base for flow sensor and spirometer - Google Patents

Abstract

A disposable flow sensor (10) applied for pulmonary function testing and a sensor mounting base (200) used cooperatively therewith and a spirometer. The disposable flow sensor (10) comprises a throttle tube for respiratory ventilation, a pressure tapping stub (5) disposed on the throttle tube and in communication with a venting hole of the throttle tube, and snap fit connectors (11) enabling the snap fit between the flow sensor (10) and the sensor mounting base (200) or the spirometer. The apparatus prevents cross-infection caused by incomplete cleaning and disinfection of a flow sensor and has improved effects of seal, dust-proof and airtightness. The apparatus is also easy to operate and is useful in the fields of physical examination in hospital and personal daily use for illness monitoring.

Description

Single-use flow sensor, flow sensor mount and lung function meter Technical field

The invention relates to a medical device for detecting lung function, in particular to a single-use flow sensor applied to a pulmonary function meter, and a sensor mount and a lung function meter matched therewith.

Background technique

Performing a routine lung function test using a pulmonary function meter or a spirometer is an important method for the diagnosis of human respiratory performance. During the examination, the saliva, sputum, oral secretions, food residue, etc. when the subject breathes or coughs are easily sprayed and adhered to the test instrument, causing pollution and easily causing cross-infection. In order to avoid cross-infection, products such as a lung function meter and a spirometer are used in the market, and a mouthpiece plus a disposable breathing filter is used. Although the mouthpiece and filter are disposable, disposable respiratory filters cannot select the filter with the highest filtration efficiency. The higher the filtration efficiency, the better the isolation effect, but the greater the resistance to the airflow, the greater the influence on the gas flow measured by the lung function, and the greater the error in the measurement. The lung function test standard requires airflow resistance in the flow range of 14L/S, and the airflow resistance must be less than 1.5cmH ₂ O/L/s. Therefore, the disposable breathing filter can only take into account the filtration efficiency. The filter with low airflow resistance is selected. Although it has the effect of isolating bacteria and viruses, it cannot completely isolate bacteria or viruses from entering the flow sensor to avoid cross infection.

The filter medium of the respiratory filter is mostly woven into a mesh with electrostatically charged ultrafine polypropylene fibers. Although there is a certain role of electrostatic adsorption of fine particles, the main filtration principle is that the pore size of the filter medium is smaller than the pore diameter of the medium. The smaller the pore size between the materials, the greater the possibility that the filter medium directly intercepts the particles, and the better the filtration effect. The pore size between the fiber webs is generally large, and the double-layer or multi-layer structure is adopted. The particles below 1 μm mainly rely on adsorption filtration (the diameter of the bacteria is generally 0.5 to 4 μm, and the diameter of the virus is only 0.02 to 0.2 μm), although the current respiratory filters are With a very high filtration effect, the bacterial filtration rate is greater than 98%, but the actual filtration efficiency is related to the type, size, concentration and test method of the selected microorganisms, and does not have a good effect on the filtration rate of all bacteria, and There is basically no filtering ability for viruses with smaller diameters.

On the other hand, although the spirometer uses a filter, it is necessary to clean and disinfect the spirometer periodically. The medical pulmonary function meter is expensive and complicated in structure. It must be disassembled by a professional with special tools, and it is easy to be damaged. It needs to be thoroughly dried after disinfection, and needs to be recalibrated before use. Whole The process is cumbersome, consumes a lot of time and cost, and can't use the instrument for a long time. For the household lung function meter, although the sensor disassembly is relatively simple, it is generally only rinsed with water, cleaning and disinfection is not thorough, and it is easy to damage the instrument, affecting the measurement accuracy.

Summary of the invention

In order to overcome the disadvantages of the prior art, one of the objects of the present invention is to provide a single-use flow sensor for pulmonary function detection, including a throttling tube for breathing ventilation, a throttle tube, and a vent hole. The connecting pressure-collecting column has a clamping device on the outer wall of the flow sensor tube, and the clamping device is detachably connected to the connecting device of the pulmonary function meter.

Wherein the snap device includes a buckle having a jaw and a card connector.

Further, the buckle is a plum-like structure, and is composed of four sets of claws and a card joint. The two of the clips are opposite to each other with an equal spacing gap therebetween so that the four claws are not connected to each other and have a certain elastic opening and closing.

Another design of the snap-fit device includes symmetrically arranged hook and groove columns, each of which has a hook groove at the end, and a gap is provided in the middle of the hook groove.

In a preferred solution, the above-mentioned carding device is provided with a structure for preventing the flow sensor from being used twice.

Another object of the present invention is to provide a flow sensor mount for plugging a single use, comprising a connection device for use with a snap-on device of a disposable flow sensor, the connection device having a pressure-collecting post The jack, the air vent interface, and the snap-fit device of the disposable flow sensor cooperate and snap the connection assembly of the snap-fit device.

In one design, the snap-on device includes a buckle having a claw and a card joint, the connection assembly includes a card slot, and an inner edge of the card slot has a flange structure protruding into the card slot.

In another design, the snap-fit device includes symmetrically arranged hook-and-groove posts, each of which has a hook groove at the end, and a gap is provided in the middle of the hook groove; the connecting component includes a card slot, a button and a button installation The button has a retractable movable locking piece and a spring therein, and the locking piece and the button connection can be telescopically movable together with the button, and the locking piece on the button passes through the through hole in the button mounting seat and the through hole in the card slot Extend into the hook groove of the flow sensor.

Further, the mounting base further includes an upper cover body and a lower cover body, and the button mounting seat is disposed on the cover body.

The present invention also provides a pulmonary function meter having the above-described disposable flow sensor, including a disposable flow sensor, a differential pressure sensor, and a connection device, the disposable flow sensor including throttling of respiratory ventilation a tube, a pressure-collecting column disposed on the throttle tube and communicating with the vent hole, and a clamping device disposed on the outer wall of the flow sensor tube, the latching device being detachably connected to the connecting device of the pulmonary function meter, the connection The device includes a connection assembly.

Specifically, the snap device includes a buckle having a claw and a card joint, the connection assembly includes a card slot, and an inner edge of the card slot has a flange structure protruding into the card slot.

Specifically, the latching device includes symmetrically arranged hook and groove columns, each of the hooking groove ends has a hook groove, and a gap is provided in the middle of the hook groove; the connecting component includes a card slot, a button and a button mounting seat, The button has a retractable movable locking piece and a spring. The locking piece and the button connection can be telescopically movable together with the button. The locking piece on the button passes through the through hole in the button mounting seat and the through hole in the card slot, and then extends into the flow. Inside the hook groove of the sensor.

Compared with the prior art, the invention has the beneficial effects that the invention adopts a single-use flow sensor, completely avoids cross infection caused by incomplete cleaning and disinfection of the flow sensor, reduces the workload of detection, and facilitates the lung. Daily maintenance of the function meter. At the same time, the use of the sealing ring effectively ensures no air leakage during the test and improves the detection accuracy. At the same time, the dust pad is designed to have a good dustproof sealing effect. The cooperation between the buckle on the flow sensor and the slot of the connecting seat can achieve the one-time use requirement, and can prevent the flow sensor from accidentally falling off and leaking. The pulmonary function meter of the invention has simple operation and can avoid the occurrence of cross infection to the utmost extent. It is suitable for hospital physical examination, to avoid the occurrence of hospital sense, but also for personal daily disease monitoring, suitable for promotion and application.

DRAWINGS

Figure 1 is a schematic cross-sectional view of a disposable flow sensor with two pressure-receiving columns.

Figure 2 is a schematic view of a snap structure of a plum-shaped claw.

FIG. 3 is a schematic structural view showing the connection of the disposable flow sensor and the differential pressure sensor shown in FIG.

Figure 4 is a schematic view showing the structure of a disposable flow sensor having three pressure-receiving columns.

Figure 5 is a cross-sectional view showing the flow sensor of Figure 4 connected to the connector.

Fig. 6 is an enlarged schematic view of Fig. 5A.

Figure 7 is an exploded view of the disposable flow sensor and the connector.

Figure 8 is a schematic view of the disposable flow sensor connected to the sensor mount.

Figure 9 is an exploded view of Figure 8.

Figure 10 is a front elevational view of Figure 8.

Figure 11 is a cross-sectional view taken along line 10A-A.

Figure 12 is a cross-sectional view taken along line 10B-B.

Figure 13 is a schematic diagram of the structure of the button.

Figure 14 is a schematic view showing the structure of the button lock piece locking disposable flow sensor.

Figure 15 is a schematic view showing the structure of the button release sheet releasing the disposable flow sensor.

Figure 16 is a schematic view showing the structure of a disposable flow sensor having a mouthpiece.

Figure 17 is a schematic view of the mesh screen structure of the mouthpiece.

detailed description

Disposable flow sensor 10 for pulmonary function detection, including a throttling tube for breathing ventilation, a pressure-collecting column disposed on the throttling tube and communicating with the throttle tube vent, and a card disposed on the wall of the flow sensor tube The pick-up device is detachably connected to the pulmonary function meter through a connecting device (or a connecting seat).

Example 1

The throttling tube of the disposable flow sensor 10' shown in FIGS. 1 to 3 is mainly formed by sequentially connecting the exhalation air inlet portion 1, the first cone portion 2, the throat portion 3, and the second cone portion 4 in the section. A vent hole is provided at a suitable position of the flow tube. The pressure hole column disposed on the throat portion is a low pressure pressure hole column 5, and the pressure hole column disposed on the exhalation air inlet portion 1 is a first high pressure pressure hole column 6. The first high pressure tapping post may also be disposed on the first tapered portion 2 in another embodiment as needed. The pressure hole column is in gas communication with the throttle tube vent hole.

The disposable flow sensor is detachably coupled to the body member of the pulmonary function meter by a connecting device. In this embodiment, the connecting device is a connector 100' with a post jack 101'. Specifically, the disposable flow sensor is connected to the connection base 100', and is connected to the differential pressure sensor 300 through the pressure guiding tube 201. More specifically, the high pressure pressure-receiving hole column and the low-pressure pressure-receiving hole column of the flow sensor are respectively inserted into the corresponding hole column insertion hole 101' of the connection seat, and the pressure-receiving hole column and the hole column insertion hole are air-tightly connected. In one embodiment, the outer wall of the column of the pressure-receiving column is provided with a slot 9 in which the sealing ring 19 is assembled to ensure that the connection between the pressure-receiving column and the connector is sealed within a certain pressure range. gas.

In order to further ensure the stability of the connection between the flow sensor and the connecting device during use. In the embodiment shown in Figures 1 to 2, the snap-fit means provided on the wall of the flow sensor tube is a snap 11' comprising a pawl 12 and a card joint 13. The buckle shown in Figure 2 is a plum-like structure consisting of four sets of claws and cards. The joints are composed of two opposite to each other with an equal spacing gap 15 therebetween so that the four claws are not connected to each other and have a certain elastic opening and closing. The number of the buckles may be one or more according to design requirements, and the number of combinations of the claws and the card joints may also be one, two or more, and the arrangement thereof is not limited to the manner exemplified in the embodiment. The plum-shaped snap fastener is detachably snap-fitted to the mating connecting device by the elasticity of the claw.

As shown in FIG. 3, in the embodiment, the connecting device is a connecting base 100', and the connecting base further includes a card slot 102' corresponding to the latching position, and the latching 11' is inserted into the card slot 102 of the connecting base. The inside of the flow sensor is connected to the connector. In a specific embodiment, the engaging claw of the buckle and the engaging portion of the buckle have a convex portion 14 protruding from the claw. After the buckle is inserted into the slot, the convex portion 14 of the buckle is blocked by the inner edge 103' of the slot. , the flow sensor and the connection seat are tightly connected to prevent falling off air. The inner edge 103' has a flange structure that projects into the card slot. Depending on the design requirements, the buckle 11' can be placed anywhere on the flow sensor, such as between the two pressure taps of the flow sensor and/or the end of the flow sensor.

In a specific embodiment, the differential pressure sensor is mounted in the pulmonary function meter, and the connecting seat as the connecting device is mounted on the upper end of the pulmonary function meter, and the hole jack on the connecting seat is connected to the differential pressure sensor through the pressure guiding tube. When in use, after the disposable flow sensor is inserted into the connecting seat, the pressure-receiving hole column is respectively inserted into the corresponding hole column jack of the connecting seat, and the buckle of the locking device is engaged with the card slot in the connecting seat to ensure one-time cooperation. The flow sensor is mounted for stability on the spirometer. When the flow sensor is replaced at the end of the test, as long as the end of the flow sensor is pulled up slightly, the gap between the claws causes the jaws to have a large deformation force, and the entire buckle is elastically deformed and then slides out of the card slot. The disposable flow sensor can be pulled out smoothly. In a specific embodiment, a microprocessor is also installed within the pulmonary function meter for processing data in the differential pressure sensor. The spirometer may also include a data storage unit. More preferably, a display is also mounted on the spirometer to display the test results.

Example 2

In the embodiment shown in FIGS. 4 to 12, the throttle tube of the disposable flow sensor 10 is mainly connected by the exhalation air inlet portion 1, the first cone portion 2, the throat portion 3 and the second cone portion 4 in sequence. . In another embodiment, an intake air intake portion 8 is further provided outside the second tapered portion 4. The pressure hole column disposed on the throat portion is a low pressure pressure hole column 5, and the pressure hole column disposed on the exhalation air inlet portion 1 or the first cone portion 2 is a first high pressure pressure hole column 6 The pressure-receiving hole column on the suction air inlet portion 8 or the second cone portion 5 is the second high-pressure pressure-collecting hole column 7. The pressure hole column is connected to the throttle tube vent hole.

In this embodiment, the pulmonary function meter includes a flow sensor mount for inserting a disposable flow sensor, and a differential pressure sensor is mounted in the sensor mount. The differential pressure sensor is connected to the microprocessor via a data line. A connection device is mounted on the flow sensor mount 200, and the disposable flow sensor and the sensor mount are detachably connected by a connection device. The microprocessor may be provided by a pulmonary function meter or may be an external device such as a computer.

The flow sensor mount size can be designed to accommodate the size of the tester's hand. That is, the mount of the flow sensor can also serve as the handle of the pulmonary function meter, and the tester can hold the mount for the lung function detection.

In the embodiment, the connecting device is the connecting base 100. In a specific embodiment, the connector 100 includes a hole jack 101, a card slot 102, and a lock member 104 corresponding to the hole jack. The front end of the lock member is provided with an air duct interface 105, and the air duct interface is The pressure differential tube of the differential pressure sensor is connected. The hole between the hole jack and the lock is fixed by screws or the like. When the pressure hole of the flow sensor is inserted into the jack 101 of the connector, the hole column, the jack, the lock and the air pipe are taken. A gas passage is formed between the interfaces. The outer wall of the column of the pressure-receiving column 7 is provided with a slot 9 in which the sealing ring 19 is assembled, ensuring that there is no leakage between the pressure-receiving column and the inner wall of the connecting seat within a certain pressure range. A dustproof pad 106 is placed in the lock member to ensure a sealed dustproof effect at the junction of the connecting seat and the throttle tube. In another embodiment, the connector 100 includes a hole jack 101 and a card slot 102. The front end of the hole jack is integrally formed with an air pipe connection, and the air pipe connection is connected to the pressure sensor of the differential pressure sensor without a lock. 104.

In the embodiment, the snap-fit device of the flow sensor includes symmetrically arranged hook-and-groove posts 17, each of which has a hook groove 18 at the end, and a gap 20 is provided in the middle of the hook groove for locking the lock and retractable movable lock. Stay in the hook slot. The number of combinations of the hook groove and the hook groove may be one, two or more, and the arrangement thereof is not limited to the manner exemplified in the embodiment, and may be disposed at any position of the flow sensor, for example, two pressures are set in the flow sensor. The ends of the columns and/or the flow sensor.

8 to 15, the sensor mount 200 further includes a button 202 having a telescopic movable locking piece 203 and a spring 204 therein. The locking piece and the button connection can be telescopically movable together with the button. In a more specific embodiment, the spring is sleeved on the spring post 211 in the middle of the button, and the locking tabs are respectively mounted on both sides of the button. The sensor mount includes an upper cover body and a lower cover body, and a button mount 205 is disposed on the cover body. After the locking piece on the button passes through the through hole in the button mounting seat and the through hole in the connecting seat card slot, the flow sensor is locked in the hook groove extending into the flow sensor, and the locking piece is extended to the hook by pressing the key A flow sensor is released between the inner walls of the tank. With After the button is loaded into the sensor mount, the lock tab 203 on the button sequentially passes through the through hole 207 of the button mount and the through hole 107 on the connector slot, and then extends into the card slot, and the card A space is reserved between the inner walls of the groove, which allows the hook groove 18 of the flow sensor to be inserted, and the hook groove is locked with the sensor mounting seat by the movable locking piece locking the hook groove. The hook groove 208 on the button is snapped into the card hole 206 in the button mount 205 to mount the button on the sensor mount.

When the disposable flow sensor is inserted into the connector, pressing the button allows the button lock 203 and the inner wall of the card slot to leave enough space for the hook groove 18 on the flow sensor to be inserted into the space (the space is the hook slot insertion connection of the flow sensor). The passage of the seat), then release the button, rebound by the spring 204, and the locking piece 203 of the button is located on the passage of the hook groove 18, thereby locking the hook groove 18 of the flow sensor, and the flow sensor cannot be pulled out at this time. The measurement of respiratory airflow parameters was carried out. When the flow sensor is to be taken out, the button is pressed to increase the distance between the locking piece 203 and the inner wall of the card slot 102, and the hook groove is no longer locked by the locking piece. At this time, the disposable flow sensor can be pulled out.

In a specific embodiment, the pressing stroke L of the button is 2 mm, and the limiting stroke S of the hook groove is 1.2 mm. As shown in FIG. 14, after the spring rebounds, the locking piece 203 is secured above the hook groove 18, so that the hook groove is in a locked state, and the flow sensor cannot be pulled out. As shown in FIG. 15, after the button is pressed, the locking piece 203 is moved inward by 1.6 mm, and the distance d between the foremost end of the locking piece 18 and the locking piece is 0.4 mm, and the hook groove is no longer locked, and can be pulled out at this time. One-time flow sensor.

When performing the lung function test, the disposable flow sensor of the embodiment is first inserted into the connector seat on the sensor mount, and the differential pressure sensor in the sensor mount is connected to the data processing unit of the pulmonary function meter through the data cable. The data processing unit is configured to analyze data detected by the differential pressure sensor. The data processing unit can be a microprocessor or the like. More specifically, the pressure-receiving post on the flow sensor is inserted into the post socket of the connector, and the button of the sensor mount locks the hook groove on the disposable flow sensor. After the disposable flow sensor is installed, perform a lung function test. After the test is completed, press the button to release the hook slot, and the disposable flow sensor can be replaced smoothly. In the present embodiment, the differential pressure sensor is mounted in the mount, and the microprocessor for processing the detected data is installed in the pulmonary function meter, and the pulmonary function meter may further include a data storage unit. More preferably, a display is also mounted on the spirometer to display the test results.

Example 3

The flow sensor's snap-on device (such as snap or hook groove column and hook groove structure) is provided with anti-secondary The structure used. After the force sensor is pulled out, the clamping device will actively appear to be damaged, broken or deformed, and the damaged clamping device can no longer be inserted into the differential pressure sensor to prevent the flow sensor from being reused. For example, a crease line is arranged on the buckle claw. When the flow sensor is pulled out, the claw is easily bent along the crease line after being stressed, and is no longer vertical before being used, thereby reminding The user has already used the flow sensor.

Example 4

As shown in Figures 16 to 17, the front end of the disposable flow sensor exhalation air inlet 1 can also be provided with a mouthpiece 20 having a honeycomb mesh screen 21 on which the honeycomb holes 22 are arranged. The honeycomb mesh screen is mainly used to stabilize the airflow. When the measured person has more saliva and sputum, it can also play a certain filtering role, so as not to affect the accuracy of the flow sensor.

The relationship between the fluid flow rate and the differential pressure of the flow sensor is based on the fluid mechanics Bernoulli equation, which must satisfy the fluid laminar flow condition, that is, when the fluid enters the throat, the flow beam is parallel to the tube axis and cannot be turbulent. However, in order to shorten the length of the flow sensor for the application of the pulmonary function meter, the DC section of the flow sensor is greatly shortened, and the gas exhaled by the human body enters the throat through a short DC section, which cannot fully satisfy the laminar flow condition, affects the measurement accuracy, and increases the cellular mesh network. Screen rectification can eliminate turbulence and improve airflow uniformity. The smaller the mesh aperture of the honeycomb hole, the larger the thickness, the better the effect, but the airflow resistance will increase, resulting in pressure loss. In a specific embodiment, a large-aperture honeycomb mesh screen having a small airflow resistance is selected, for example, a honeycomb mesh thickness ranging from 0.5 mm to 2.5 mm, and a pore diameter ranging from 2.0 mm to 5.0 mm. In a preferred embodiment, the aperture is 5 mm and the mesh thickness is 1 mm.

Example 5

The sensor mount 200 used in conjunction with the disposable flow sensor shown in FIGS. 7 through 9 includes an upper cover 209 and a lower cover 210 and is mounted with a connector 100. The connecting socket is provided with a hole jack 101 and a card slot 102. A position corresponding to the hole jack is provided with an air guiding port 105, and the differential pressure sensor is connected to the air guiding port through the pressure guiding tube.

Example 6

The spirometer includes a disposable flow sensor, a flow sensor connection, and a differential pressure sensor. In a further aspect, the spirometer includes a flow sensor mount, the attachment device is mounted on the mount of the flow sensor, and the differential pressure sensor is disposed within the mount of the flow sensor. In still further aspects, the phlebometer further includes a microprocessor and a data storage unit. In another embodiment, a display is also mounted on the spirometer to display the test results.

The throttling tube of the disposable flow sensor shown in FIGS. 1 and 3 is mainly formed by sequentially connecting the exhalation air intake portion 1, the first tapered portion 2, the throat portion 3, and the second tapered portion 4. The pressure hole column disposed on the throat portion is a low pressure pressure hole column 5, and the pressure hole column disposed on the exhalation air inlet portion 1 is a first high pressure pressure hole column 6. The high pressure pressure tapping column is connected to the positive pressure end of the differential pressure sensor 300, and the low pressure pressure receiving hole column is connected to the negative pressure end of the differential pressure sensor.

The throttling tube of the disposable flow sensor shown in FIGS. 4 to 5 is mainly formed by sequentially connecting the exhalation air intake portion 1, the first tapered portion 2, the throat portion 3, and the second tapered portion 4. Wherein the first high pressure tapping post 6 of the first taper of the flow sensor is connected to the positive pressure end of the first differential pressure sensor, and the positive pressure of the second high pressure tapping column 7 of the second taper and the second differential pressure sensor The end connection, the low pressure end of the two differential pressure sensors are respectively connected to the low pressure pressure receiving hole column 5 of the throat through the three-way pipe.

The exhalation air inlet 1 and the throat portion 3 have a cylindrical shape, and the diameter of the exhalation air inlet portion is larger than the diameter of the throat portion. The first tapered portion 2 and the second tapered portion 4 have a truncated cone shape, and the first tapered portion and the second tapered portion have smaller diameter ends toward the throat portion.

The differential pressure sensor is connected to the microprocessor, and the microprocessor is used to collect and process the signal of the differential pressure sensor, and calculate and analyze various functional indexes of the tester according to the pressure difference between the high and low pressure pressure-collecting columns, as a test. A reference indicator of current physical condition or treatment effect.

Although in a specific embodiment, a one-to-one combination of the flow sensor throttle, the pressure-collecting post, the snap-fit device, and the mating connecting means are provided. However, those skilled in the art are aware that, according to design requirements, the number of the pressure-collecting holes of the flow sensor, the structure of the snap-in device, and the connecting device can be arbitrarily combined, and these cooperation modes are all within the protection scope of the present invention. For example, a snap device having a jaw and a hook groove can be mounted on the throttle tube having two pressure-receiving bores, and the corresponding mating connection device is constructed as a button having a locking tab. The combination of different types of disposable flow sensors and different internal structure of the pulmonary function meter can also be freely selected according to the needs, as long as the pressure hole column and the hole column jack, the snap device (snap) and the connection The structure such as the device (connector) can be adapted.

Claims (12)

The single-use flow sensor comprises a throttling tube for breathing ventilation, a pressure-collecting column disposed on the throttling tube and communicating with the vent hole, wherein the outer wall of the flow sensor tube is provided with a clamping device, and the clamping device Removably attached to the connection device of the pulmonary function meter. The flow sensor of claim 1 wherein said snap means is a buckle comprising a jaw and a card joint. The flow sensor according to claim 2, wherein the buckle is a plum-like structure, and is composed of four sets of claws and a card joint, which are opposite to each other with an equal interval between the four claws. Not connected, there is a certain degree of flexibility. The flow sensor according to claim 1, wherein the engaging device comprises a symmetrically arranged hook groove column, each of the hook groove columns has a hook groove at the end, and a gap is provided in the middle of the hook groove. The disposable flow sensor according to claim 1, wherein the snap device is provided with a structure for preventing the flow sensor from being used twice. A flow sensor mount for plugging a single use, comprising: a connecting device for use with a snap-on device of a disposable flow sensor, wherein the connecting device is provided with a pressure-collecting hole jack and an air-hole interface And engaging with the snap-on device of the disposable flow sensor and clamping the connection assembly of the snap-on device. The flow sensor mount according to claim 6, wherein the snap device comprises a buckle having a claw and a card joint, the connection assembly comprises a card slot, and an inner edge of the card slot has a card slot Inner protruding flange structure. The sensor mount according to claim 6, wherein the latching device comprises symmetrically arranged hook and groove columns, each of the hooking groove ends has a hook groove, and a gap is provided in the middle of the hook groove; The utility model comprises a card slot, a button and a button mounting seat, wherein the button is provided with a retractable movable locking piece and a spring, and the locking piece and the button connection can be telescopically movable together with the button, and the locking piece on the button passes through the through hole in the button mounting seat And the through hole in the card slot extends into the hook groove of the flow sensor. The sensor mount of claim 8 further comprising an upper cover and a lower cover, the button mount being disposed on the cover. a spirometer, comprising a disposable flow sensor, a differential pressure sensor and a connecting device, the disposable flow sensor comprising a throttling venting throttling tube, a pressure venting column disposed on the throttling tube and communicating with the venting hole, The utility model is characterized in that a clamping device is arranged on the outer wall of the flow sensor tube, and the clamping device is detachable Disconnected to the connection device of the pulmonary function meter, the connection device comprising a connection assembly. The pulmonary function meter according to claim 10, wherein the engaging device comprises a buckle having a claw and a card joint, the connecting assembly comprises a card slot, and an inner edge of the card slot has a direction into the card slot Prominent flange structure. The sensor mount according to claim 10, wherein the engaging device comprises a symmetrical arrangement of hook groove columns, each of the hook groove posts has a hook groove at the end, and a gap is provided in the middle of the hook groove; The utility model comprises a card slot, a button and a button mounting seat, wherein the button is provided with a retractable movable locking piece and a spring, and the locking piece and the button connection can be telescopically movable together with the button, and the locking piece on the button passes through the through hole in the button mounting seat And the through hole in the card slot extends into the hook groove of the flow sensor.

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