Pulmonary function test assistive device

Abstract

The utility model relates to the field of pulmonary function test devices, and discloses a pulmonary function test auxiliary device, comprising an expiratory tube body for connecting to a pulmonary function detector, the expiratory tube body comprising a tube body, a mouthpiece connected and communicating with the tube body, and a nasal blocking portion connected to the mouthpiece, the nasal blocking portion comprising a plug portion for blocking the nasal cavity and a limiting portion connected to the plug portion for clamping on the nose wing of a test child, the plug portion and the mouthpiece being connected and fixed by a connecting portion. The tube body is connected to the pulmonary function detector, so that the test child can measure the pulmonary ventilation and gas exchange function when exhaling to the mouthpiece, the plug portion is used to block the nasal cavity of the test child, the limiting portion is set on the bridge of the nose of the test child, and when the test child exhales through the nasal cavity, the limiting portion is blocked by the nasal cavities on both sides and pulls the plug portion connected thereto, so that the plug portion will not easily detach from the nasal cavity and the test child can exhale through the mouthpiece, thereby completing the pulmonary function test.

Description

Technical Field

[0001] The utility model relates to the field of pulmonary function testing devices, in particular to a pulmonary function testing auxiliary device. Background Art

[0002] Pediatric pulmonary function test is one of the important examination methods for respiratory diseases. Children's lung function plays an important role in the diagnosis, differential diagnosis, evaluation of disease severity, judgment of efficacy and prognosis of asthma. At present, the pulmonary function test of children mainly tests the ventilation and gas exchange function of the lungs. During the test, the expiratory tube is connected to the pulmonary function tester, and the test child puts his mouth on the expiratory tube and wraps his lips around the expiratory tube to block the expiratory tube. In order to ensure the test effect, the test child's nose needs to be pinched so that he can only inhale and exhale through the mouth. For this purpose, the traditional method is to use a clip to clamp the sides of the nose from both sides of the nose to block the nasal cavity. This method will not only leave a heavy indentation on the nose of the test child, but also the whole test process needs to last for a certain time. For blocking the nasal cavity only by clamping, the clip will squeeze the skin on both sides of the nose and cause pain and other discomfort. In order to avoid this problem, some test children will wear nasal plugs to block the nasal cavity, but when the test children exhale and inhale through the mouth, the movement of the mouth can easily drive the nasal activity, and when exhaling, the child's control ability is poor. The test children may accidentally breathe through the nose during the ventilation process and cause the nasal plug to slip off, affecting the test effect. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a lung function test auxiliary device to solve at least one problem mentioned in the background technology.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a pulmonary function test auxiliary device including an expiratory tube body for connecting to a pulmonary function detector, the expiratory tube body including a tube body, a mouthpiece connected and communicating with the tube body, and a nasal blocking part connected to the mouthpiece, the nasal blocking part including a plug part for blocking the nasal cavity and a limiting part connected to the plug part for being mounted on the nose wings of the test child, the plug part and the mouthpiece are connected and fixed by a connecting part, through the cooperation between the plug part and the limiting part, when the plug part is used to block the nasal cavity, the limiting part is mounted on the bridge of the nose, and the nose wings on both sides will block the limiting part to prevent the limiting part from sliding off, and after the plug part is connected to the limiting part, when the test child uses the nasal cavity to exhale, the nose wings on both sides will stabilize the plug part by blocking the limiting part, especially when using the nasal cavity to exhale, the nose wings on both sides will stretch and widen backwards, thereby enhancing the blocking of the limiting part, so that the limiting part can pull the plug part to prevent the plug part from sliding off.

[0005] Furthermore, the tube body includes a first tube segment for connecting to a pulmonary function detector, a second tube segment threadedly connected to the first tube segment, and a third tube segment sealingly and rotatably connected to the second tube segment; a connecting plate is fixedly connected between the mouthpiece and the third tube segment, and the first tube segment, the second tube segment, the third tube segment, the connecting plate and the mouthpiece are connected in sequence to facilitate installation and disassembly of the tube body through the second tube segment, and to facilitate replacement of the tube body.

[0006] Furthermore, the connecting part is made of a semi-hard material so that the connecting part can provide elastic support to the plug part through the mouthpiece.

[0007] Furthermore, the connecting portion includes a first connecting strip with one end fixedly connected to a side of the mouthpiece close to the connecting plate, a second connecting strip having two ends and a middle portion connected to the first connecting strip, and a third connecting strip with one end connected to the second connecting strip, the first connecting strip is connected to the second connecting strip at one end thereof and extends in an arc upward relative to the mouthpiece and toward a side away from the connecting plate, both ends of the second connecting strip extend in an arc toward a side away from the connecting plate and are connected to the plug portion, the other end of the third connecting strip extends in an arc upward relative to the second connecting strip and toward a side away from the connecting plate and is connected to the limiting portion, the first connecting strip and the second connecting strip both provide support for the plug portion, and when the test child inserts the plug portion into the nasal cavity and when the test child exhales through the nasal cavity, the first connecting strip and the second connecting strip elastically support the plug portion to resist the plug portion, thereby successfully preventing the plug portion from being blown off.

[0008] Furthermore, the connecting part also includes a fourth connecting strip, one end of the fourth connecting strip is connected to the middle part of the second connecting strip, and the other end extends toward one side of the connecting plate and in an upward arc to be connected to the connecting plate, so as to form a triangle shape with the first connecting strip and the connecting plate to form a plug part, forming a stable elastic support, forming a double support guarantee, and preventing the exhaled air from the nasal cavity from pushing the plug part out of the nasal cavity and failing to block the nasal cavity.

[0009] Furthermore, the plug parts are provided in two, and both of the plug parts include a truncated cone-shaped nasal plug having a large head end and a small head end with a diameter smaller than the large head end, and the two ends of the second connecting strip are respectively connected to the large heads of the two nasal plugs, so as to facilitate inserting into the nasal cavity and blocking the nasal cavity through the large head end.

[0010] Furthermore, the plug portion also includes a stretchable elastic strip spirally wound on the outer wall of the nasal plug, and a spirally sealed sealing cavity is formed between the elastic strip and the outer wall of the nasal plug. The plug portion also includes an inflation portion for inflating air into the sealing cavity. After the nasal plug is inserted into the nasal cavity, the elastic strip expands when filled with gas to gradually press against the inner wall of the nasal cavity, thereby improving the firmness of the nasal plug and the nasal cavity to a certain extent.

[0011] Furthermore, the inflation part includes a slide groove formed in a ring shape by the end surface of the large end of the nasal plug, an airway connected to the sealed cavity, and a push ring sealingly slidably arranged in the slide groove, one end of the push ring extending out of the slide groove to deliver or inhale air into the sealed cavity by pushing the push ring.

[0012] Furthermore, the limiting portion includes a mounting bar whose middle portion is connected to the third connecting bar and away from one end of the second connecting bar, and two support blocks respectively connected to the two ends of the mounting bar. The two ends of the mounting bar face away from each other and extend in a downward arc so that it can be mounted on the bridge of the nose of the test child. The two support blocks increase the contact area with the bridge of the nose and are close to the nose wings on both sides so that the nose wings can block the entire limiting portion.

[0013] Furthermore, the erection bar and the support block are integrally formed and are both made of semi-rigid elastic material and each edge is chamfered, and a rubber pad is provided on the side where the two support blocks face each other to improve the stability of the limiting part.

[0014] The pulmonary function test auxiliary device of the utility model has at least the following beneficial effects: it is connected with the pulmonary function tester through the tube body so that the pulmonary ventilation and gas exchange function can be measured when the test child exhales through the mouth; the plug part is used to block the nasal cavity of the test child; the limiting part is arranged on the nose bridge of the test child; when the test child exhales through the nasal cavity, the limiting part is blocked by the nasal cavities on both sides and pulls the plug part connected thereto, so that the plug part will not be easily separated from the nasal cavity and the test child exhales through the mouth, thereby completing the pulmonary function test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is an exploded view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the nozzle, the connecting plate and the third pipe section of the utility model;

[0019] Figure 4 It is a cross-sectional view of the nose plug, the elastic strip and the inflatable part of the utility model;

[0020] Figure 5 for Figure 4 Cross-sectional view of the elastic strip in the inflated state.

[0021] The meanings of the symbols in the accompanying drawings are:

[0022] Tube body-1; first tube section-11; connecting section-111; second tube section-12; annular groove-121; third tube section-13; sealing ring-131; connecting plate-14; mouthpiece-2; air inlet-21; nose blocking part-3; plug part-31; nasal plug-311; elastic strip-312; sealing cavity-3121; inflation part-313; slide groove-3131; airway-3132; push ring-3133; limiting part-32; erection strip-321; support block-322; connecting part-4; first connecting strip-41; second connecting strip-42; third connecting strip-43; fourth connecting strip-44. DETAILED DESCRIPTION

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the pulmonary function test auxiliary device of the present invention includes an expiratory tube body for connecting to a pulmonary function tester. After the expiratory tube body is connected to the pulmonary function test auxiliary device, the child being tested exhales into the expiratory tube body, so that the pulmonary function tester can test the ventilation and gas exchange functions of the child being tested.

[0025] In this embodiment, the exhalation tube body includes a tube body 1, a mouthpiece 2 connected to and communicating with the tube body 1, a nasal blocking portion 3 connected to the mouthpiece 2, and a connecting portion 4 for connecting the nasal blocking portion 3 to the mouthpiece 2. The tube body 1 is used to connect and communicate with the pulmonary function tester and the mouthpiece 2 respectively. The nasal blocking portion 3 is used to block the nasal cavity of the test child. After the test child's mouth wraps the mouthpiece 2, the test child can blow air into the mouthpiece 2 to perform normal ventilation and gas exchange function testing. The connecting portion 4 connects the nasal blocking portion 3 to the mouthpiece 2 to prevent the nasal blocking portion 3 from separating from the mouthpiece 2. At the same time, the connecting portion 4 provides support for the nasal blocking portion 3. When the test child exhales through the nasal cavity, the connecting portion 4 presses against the nasal blocking portion 3 to limit the nasal blocking portion 3 from separating from the nasal cavity.

[0026] like Figure 1 and Figure 2As shown, in this embodiment, the tube body 1 includes a first tube segment 11 for connecting to a pulmonary function detector, a second tube segment 12 threadedly connected to the first tube segment 11, and a third tube segment 13 sealed and rotatably connected to the second tube segment 12. A connecting plate 14 is fixedly connected between the mouthpiece 2 and the third tube segment 13. The first tube segment 11, the second tube segment 12, the third tube segment 13, the connecting plate 14 and the mouthpiece 2 are connected in sequence. The cooperation of the first tube segment 11 and the second tube segment 12 enables the mouthpiece 2 to be detachably connected to the first tube segment 11, so that the mouthpiece 2 can be connected to the first tube segment 11 by means of a threaded connection. While ensuring a sealed connection between the first tube segment 11 and the second tube segment 12, the connection method is also relatively simple, and has stronger sealing and firmness than the sleeve method in the prior art. The first pipe section 11, the second pipe section 12 and the third pipe section 13 are all circular hollow tubular structures. One end of the first pipe section 11 is fixedly connected to the corresponding structure of the pulmonary function detector. A connecting section 111 is coaxially formed on the other end of the first pipe section 11. The connecting section 111 is in a circular ring and coaxially distributed with the first pipe section 11. The diameter of the connecting section 111 is smaller than the diameter of the first pipe section 11 and is adapted to the inner diameter of the second pipe section 12. An external thread is provided on the outer wall of the connecting section 111, and a corresponding internal thread is formed in the inner wall of one end of the second pipe section 12, thereby realizing a threaded connection between the first pipe section 11 and the second pipe section 12, ensuring sealing and stable connection. In order to prevent the mouthpiece 2 from rotating with the installation of the second pipe section 12 during connection, a plurality of annular grooves 121 are provided in a circumferential manner on the inner wall of the end of the second pipe section 12 away from the first pipe section 11. The outer diameter of the third pipe section 13 is adapted to the inner diameter of the second pipe section 12, so that the third pipe section 13 can penetrate into the second pipe section 12, and a sealing ring 131 is fixedly sleeved on the outer wall of the third pipe section 13 along the circumferential direction. The outer diameter of the sealing ring 131 is larger than the diameter of the annular groove 121, and an annular ring adapted to each annular groove 121 is convexly provided on the outer wall of the third pipe section 13 along the circumferential direction. The third pipe section 13 penetrates into the second pipe section 12, and the number and position of each annular ring plus the sealing ring 131 correspond to each annular groove 121 one by one, and the annular ring is clamped into the annular groove 121, and the sealing ring 131 is clamped in the corresponding annular groove 121, so that the second pipe section 12 and the third pipe section 13 are rotatably connected and sealed, so that the angle of the mouthpiece 2 can be kept unchanged during installation or disassembly, so that the mouthpiece 2 is located at an angle that is convenient for wrapping the mouth of the test child. The connecting plate 14 is a cylindrical sheet or columnar structure, which is convenient for realizing the connection between the third tube segment 13 and the mouthpiece 2. One end of the third tube segment 13 and one end of the mouthpiece 2 are respectively fixedly connected to the two side surfaces of the connecting plate 14 and are coaxially arranged. A through opening connecting the inner cavity of the third tube segment 13 and the inner cavity of the mouthpiece 2 is opened on the connecting plate 14 to realize the connection.

[0027] like Figures 1 to 3As shown, in this embodiment, the mouthpiece 2 is a square tube structure, or a tubular structure with an elliptical radial cross section, and an air inlet 21 is axially opened on the mouthpiece 2. Each side of the mouthpiece 2 is chamfered.

[0028] like Figure 4 and Figure 5 As shown, in this embodiment, the nose blocking part 3 includes a plug part 31 for blocking the nasal cavity and a limiting part 32 connected to the plug part 31 for being mounted on the nose wing of the test child. The limiting part 32 is hung on the nose wing when the test child exhales through the nose, thereby limiting the plug part 31 from coming out of the nasal cavity to a certain extent, thereby achieving the purpose of limiting the plug part 31 from coming out. The plug part 31 is provided in two pieces, and the two plug parts 31 each include a truncated cone-shaped nose plug 311, a stretchable elastic strip 312 spirally wound on the outer wall of the nose plug 311, and an inflatable part 313. The nose plug 311 has a large head end and a small head end with a diameter smaller than the large head end. The connecting part 4 is respectively connected to the large heads of the two nose plugs 311. When in use, the small ends of the two nasal plugs 311 are inserted into the nasal cavity of the test child, and as the nasal plugs 311 are inserted into the nasal cavity, the gradually widened large ends gradually block the nasal cavity until the nasal plugs 311 can no longer be inserted, and the nasal cavity is blocked. The frustum-shaped nasal plug 311 is easy to insert into the nasal cavity and complete the blocking function, but it is also easy to fall off. After the unrestricted part 32 is mounted on the bridge of the nose, the two ends rest on the wings of the nose on both sides. Since the bridge of the nose is at an oblique downward angle as a whole, the wings of the nose can be blocked from below the limiting part 32 The limiting portion 32 slides down, and the nasal plug 311 connected to the limiting portion 32 enables the test child to pull the nasal plug 311 when using the nasal cavity to exhale, thereby preventing the nasal plug 311 from falling off to a certain extent; in order to increase the firmness between the nasal plug 311 and the inner wall of the nasal cavity, the elastic strip 312 is inflated through the inflation portion 313, so that the elastic strip 312 expands and presses against the inner wall of the nasal cavity, thereby greatly reducing the possibility of the nasal plug 311 falling off the nasal cavity and improving the sealing stability and firmness between the nasal plug 311 and the nasal cavity.

[0029] In this embodiment, the elastic strip 312 is made of rubber and is in the shape of a long strip. The elastic strip 312 is spirally wound around the outer wall of the nasal plug 311, and each side of the elastic strip 312 is bonded to the outer wall of the nasal plug 311, so that the elastic strip 312 and the outer wall of the nasal plug 311 together form a spirally sealed sealing cavity 3121, and the inflation portion 313 is used to inflate the sealing cavity 3121. In the initial state, the inflation portion 313 does not inflate the sealing cavity 3121. The elastic strip 312 fits the outer wall of the nasal plug 311 under its own elastic action, so that the nasal plug 311 can enter the nasal cavity when in use. At the same time, the elastic strip 312 itself can increase the friction between the inner wall of the nasal cavity, so that the nasal plug 311 is not easily separated from the nasal cavity.

[0030] In this embodiment, the inflatable part 313 includes a slide groove 3131 formed in an annular shape by the end surface of the large end of the nasal plug 311, an airway 3132 connected to the sealed cavity 3121, and a push ring 3133 sealingly and slidably arranged in the slide groove 3131, one end of the push ring 3133 extending outward from the slide groove 3131 and one end sealingly and slidably arranged in the slide groove 3131. When in use, the push ring 3133 is pushed to slide in the slide groove 3131 so that the push ring 3133 slides in the slide groove 3131 and inflates or inhales air into the sealed cavity 3121 through the airway 3132, thereby controlling the expansion and contraction of the elastic strip 312, so as to facilitate clamping the nasal plug 311 in the nasal cavity or removing the nasal plug 311. In the content defined in this embodiment, the slide groove 3131 is arranged coaxially with the nasal plug 311 and is in a circular shape. One end of the airway 3132 is formed by a side surface of the slide groove 3131 close to the small end of the nasal plug 311 and opening toward the small end. The other end of the airway 3132 can be divided into multiple branches that penetrate the nasal plug 311 and connect to the sealing cavity 3121. The other end of the airway 3132 can also be only one branch that penetrates the nasal plug 311 and connects to the sealing cavity 3121. The axial length of the push ring 3133 is greater than the axial length of the slide groove 3131. Before use, one end of the push ring 3133 extending into the slide groove 3131 is located on the side of the slide groove 3131 close to the large end. After the nasal plug 311 is inserted into the nasal cavity to block the nasal cavity, the push ring 3133 is pushed toward the small end of the nasal plug 311 to squeeze the slide groove 3131 and lift the slide groove 3131 to push it toward the airway 3132 and finally enter the sealing cavity 3121. The elastic strip 312 expands until the elastic strip 312 presses against the nasal cavity. The elastic strip 312 presses against the contour of the inner wall of the nasal cavity and limits the nasal plug 311 from detaching from the nasal cavity through friction and the pressing force, so that the nasal plug 311 is more firmly inserted into the nasal cavity to prevent the nasal plug 311 from falling out.

[0031] In this embodiment, the limiting portion 32 includes a mounting strip 321 connected to the connecting portion 4 in the middle and two support blocks 322 connected to the two ends of the mounting strip 321, and the two ends of the mounting strip 321 are opposite to each other and extend in a downward arc, so that the mounting strip 321 is in an arc shape as a whole and is convenient for mounting on the bridge of the nose. The mounting strip 321 and the support block 322 are integrally formed and are both made of semi-rigid elastic material and each side is chamfered. Polyurethane can be used to have a certain elasticity. The width between the two ends of the mounting strip 321 is less than the width of the average nose wing of humans, so that the mounting strip 321 can be mounted on the bridge of the nose and against the nose wings on both sides, so as to be hung on the bridge of the nose. The two support blocks 322 are circular and have a diameter greater than the width of the mounting strip 321, so as to increase the contact area between the bridge of the nose and facilitate the collision with the nose wings. As a preferred embodiment, a rubber pad can be provided on the side of the two support blocks 322 facing each other, so as to increase the friction between the support block 322 and the bridge of the nose.

[0032] like Figure 1 and Figure 2As shown, in this embodiment, the connecting portion 4 is made of a semi-rigid elastic material and is respectively connected to the plug portion 31 and the mouthpiece 2 to support the plug portion 31. The connecting portion 4 includes a first connecting strip 41 having one end fixedly connected to the mouthpiece 2 on a side close to the connecting plate 14, a second connecting strip 42 having two ends and a middle portion connected to the first connecting strip 41, a third connecting strip 43 having one end connected to the second connecting strip 42, and a fourth connecting strip 44. The first connecting strip 41 is in the shape of a long strip and its two ends are respectively connected to the mouthpiece 2 and the middle portion of the second connecting strip 42, and one end of the first connecting strip 41 connected to the second connecting strip 42 is bent upward relative to the mouthpiece 2 and extends toward the side away from the connecting plate 14 to form an arc shape, so as to bend the first connecting strip 41 and support the second connecting strip 42 at the same time. The second connecting strip 42 is in the shape of an elongated strip and its two ends extend in the reverse direction and both bend and extend toward the side away from the connecting plate 14, and the two ends of the second connecting strip 42 are respectively connected to the large ends of the two nasal plugs 311 of the plug portion 31, so that the first connecting strip 41 and the second connecting strip 42 are both used to support the two nasal plugs 311, and at the same time, the two nasal plugs 311 are separated and correspond to the two nasal cavities of the test child. At the same time, due to the material of the second connecting strip 42, the distance between the two nasal plugs 311 can be adjusted according to the width of the distance in use. The third connecting strip 43 is in the shape of an elongated strip and its two ends are respectively connected to the middle part of the second connecting strip 42 and the middle part of the mounting strip 321. The end of the third connecting strip 43 away from the second connecting strip 42 is curved and extends upward relative to the second connecting strip 42 and toward the side away from the connecting plate 14, so that the mounting strip 321 can be spaced apart upward relative to the two nasal plugs 311 toward the side away from the connecting plate 14, so that the nasal plug 311 can be inserted into the nasal cavity while the mounting strip 321 can be mounted on the bridge of the nose. At the same time, the connection between the nasal plug 311 and the mounting strip 321 is achieved through the third connecting strip 43, so that when the mounting strip 321 is mounted on the bridge of the nose, the mounting strip 321 limits the nasal plug 311 from moving toward the side of the connecting plate 14. The fourth connecting bar 44 is in the shape of a long strip and its two ends are respectively connected to the middle part of the second connecting bar 42 and the connecting plate 14. One end of the fourth connecting bar 44 connected to the second connecting bar 42 is located above the first connecting bar 41, and one end of the fourth connecting bar 44 connected to the connecting plate 14 is connected to the top of the connecting plate 14, so that the first connecting bar 41, the fourth connecting bar 44 and the connecting plate 14 form a triangle. When in use, when the nasal plug 311 is inserted into the nasal cavity of the test child, the first connecting strip 41 and the fourth connecting strip 44 allow the distance of the nasal plug 311 relative to the connecting plate 14 to be adjusted and elastically squeeze the nasal plug 311 toward one side of the nasal cavity so that the nasal plug 311 is pressed against the nasal cavity. At the same time, the elastic characteristics of the first connecting strip 41 and the fourth connecting strip 44 will not cause the nasal plug 311 to support the nasal cavity and cause discomfort, and it can be used for test children with different nasal positions; and when the test children use the nasal cavity to exhale, the first connecting strip 41 and the fourth connecting strip 44 elastically support the nasal plug 311 so as to press against the nasal plug 311 and prevent the nasal plug 311 from falling out of the nasal cavity.It should be noted that the lengths of the first connecting strip 41 and the fourth connecting strip 44 can be set to be adjustable, and the first connecting strip 41 and the fourth connecting strip 44 can be set to be made of two sub-strips connected by multiple buckles, so as to achieve length adjustment.

Claims

1. A pulmonary function test auxiliary device, comprising an expiratory tube body for connecting to a pulmonary function tester, characterized in that: The exhalation tube body includes a tube body, a mouthpiece connected to and in communication with the tube body, and a nose blocking portion connected to the mouthpiece, wherein the nose blocking portion includes a plug portion for blocking the nasal cavity and a limiting portion connected to the plug portion for being mounted on the nose wing of the test child, and the plug portion and the mouthpiece are connected and fixed by a connecting portion; The tube body comprises a first tube section for connecting to the pulmonary function detector, a second tube section threadedly connected to the first tube section, and a third tube section sealingly and rotatably connected to the second tube section; a connecting plate is fixedly connected between the mouthpiece and the third tube section, and the first tube section, the second tube section, the third tube section, the connecting plate and the mouthpiece are connected in sequence; The connecting portion is made of a semi-rigid elastic material; The connecting portion includes a first connecting strip having one end fixedly connected to a side of the mouthpiece close to the connecting plate, a second connecting strip having two ends and a middle portion connected to the first connecting strip, and a third connecting strip having one end connected to the second connecting strip, wherein one end of the first connecting strip connected to the second connecting strip is curved upward relative to the mouthpiece and extends toward a side away from the connecting plate, both ends of the second connecting strip are curved upward relative to the mouthpiece and extend toward a side away from the connecting plate and are connected to the plug portion, and the other end of the third connecting strip is curved upward relative to the second connecting strip and extends toward a side away from the connecting plate and is connected to the limiting portion; The connecting portion further comprises a fourth connecting strip, one end of which is connected to the middle of the second connecting strip, and the other end of which is extended toward one side of the connecting plate and in an upward arc to be connected to the connecting plate.

2. The pulmonary function test auxiliary device according to claim 1, characterized in that: The plug parts are provided with two, and both of the plug parts include a truncated cone-shaped nasal plug, the nasal plug having a large head end and a small head end with a diameter smaller than the large head end, and the two ends of the second connecting strip are respectively connected to the large heads of the two nasal plugs.

3. The pulmonary function test auxiliary device according to claim 2, characterized in that: The plug part also includes a stretchable elastic strip spirally wound on the outer wall of the nasal plug, and a spiral sealed sealing cavity is formed between the elastic strip and the outer wall of the nasal plug. The plug part also includes an inflation part for inflating air into the sealing cavity.

4. The pulmonary function test auxiliary device according to claim 3, characterized in that: The inflation part comprises a slide groove formed in an annular shape by the end surface of the large end of the nasal plug, an airway connected to the sealing cavity, and a push ring sealingly slidably arranged in the slide groove, and one end of the push ring extends out of the slide groove.

5. The pulmonary function test auxiliary device according to claim 4, characterized in that: The limiting portion includes a mounting bar whose middle part is connected to the third connecting bar and one end away from the second connecting bar, and two supporting blocks respectively connected to the two ends of the mounting bar. The two ends of the mounting bar face away from each other and extend in a downward curved arc.

6. The pulmonary function test auxiliary device according to claim 5, characterized in that: The erection strip and the support block are integrally formed and are both made of semi-rigid elastic material and each side is chamfered. A rubber pad is arranged on the side where the two support blocks face each other.

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