Breathing trainer

By designing a breathing trainer that combines exhalation and inhalation training, and utilizing the sliding of internal and external moving bodies and the changes in the airflow channel of the spring, combined with a vibration mechanism, the problem of the single function of existing breathing trainers is solved. This achieves effective respiratory muscle training and sputum clearance assistance, and improves cardiopulmonary function.

CN116570896BActive Publication Date: 2026-04-14THE SECOND AFFILIATED HOSPITAL ARMY MEDICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE SECOND AFFILIATED HOSPITAL ARMY MEDICAL UNIV
Filing Date
2023-05-06
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing breathing trainers are complex in structure and have limited function, only capable of training exhalation or inhalation. The training effect is not obvious and they cannot effectively exercise the muscles related to breathing or improve breathing difficulties.

Method used

A simple breathing trainer was designed, which combines exhalation and inhalation training. Through the sliding cooperation of internal and external moving bodies, the elastic force of the first and second springs is used to realize the change of airflow channel during exhalation and inhalation. Combined with the vibration mechanism, air oscillation is generated to exercise the respiratory muscles.

Benefits of technology

It enables simultaneous inhalation and exhalation training, improves breathing difficulties, enhances cardiopulmonary function, and assists in expectoration through air vibration, adapting to the needs of different users.

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Abstract

The application discloses a breathing training device, which comprises a shell and a training body arranged in the shell. An air nozzle is arranged at the upper end of the shell. The training body comprises an outer moving body in sealing sliding connection with the shell, an inner moving body in movable cooperation with the outer moving body, a first limiting assembly for limiting the moving state of the outer moving body and a second limiting assembly for limiting the moving state of the inner moving body. A tapered hole is arranged on the outer moving body and penetrates the outer moving body along the axis of the outer moving body. The large end of the tapered hole is close to the upper end of the shell. The inner moving body is a circular truncated cone with an outer wall in abutment with the tapered hole. The first limiting assembly comprises a fixing cylinder, a limiting ring and a first spring. The second limiting assembly comprises a limiting plate, a vertical rod, a threaded sleeve and a second spring. The breathing training device has simple structure and can simultaneously perform exhalation training and inhalation training. The training by the breathing training device is beneficial to the recovery of the function of respiratory muscles.
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Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a breathing trainer. Background Technology

[0002] During normal inhalation, the diaphragm and external intercostal muscles contract. When inhaling forcefully, accessory inhalation muscles, such as the trapezius and scalene muscles, also contract, causing the chest to rise and the thoracic cavity to expand to its maximum capacity. Exhalation occurs when the pressure inside the lungs exceeds atmospheric pressure. Normal exhalation does not involve muscle contraction. When exhaling forcefully, the internal intercostal muscles and abdominal muscles contract, increasing the pressure inside the lungs to its maximum, allowing a large amount of carbon dioxide to be expelled. Breathing training devices improve lung capacity by incorporating diaphragmatic breathing techniques; consistent training can effectively improve lung function. As people age, their respiratory muscles become weaker, and respiratory function gradually declines, leading to difficulty in expectorating phlegm and an inability to cough effectively. Therefore, it is necessary to exercise the respiratory muscles to rebuild their function.

[0003] Existing breathing trainers are all relatively complex in structure and can only perform exhalation or inhalation training, which is limited in function and the training effect is not obvious. Summary of the Invention

[0004] The purpose of this application is to provide a breathing trainer with a simple structure that can perform both exhalation and inhalation training simultaneously. By using this breathing trainer to perform exhalation and inhalation training, the muscles related to breathing can be exercised, breathing difficulties can be improved, and cardiopulmonary function can be enhanced.

[0005] To achieve the above objectives, this application provides a breathing trainer, including a housing and a trainer body disposed within the housing; the housing is a cylindrical body open at both ends, with an air nozzle at the upper end; the trainer body includes an outer moving body that is slidably connected to the housing, an inner moving body that movably cooperates with the outer moving body, a first limiting component for restricting the movement of the outer moving body, and a second limiting component for restricting the movement of the inner moving body; the outer moving body has a conical hole that penetrates the outer moving body along its axis, with the larger end of the conical hole near the upper end of the housing; the inner moving body is a frustum whose outer wall fits against the conical hole; the first limiting component includes a fixed cylinder, a limiting ring, and a first spring. A fixed cylinder is positioned above the external moving body and fixedly connected to the housing. A limiting ring is positioned below the external moving body and detachably connected to the housing. The lower end of the first spring is fixedly connected to the limiting ring, and the upper end of the first spring is fixedly connected to the external moving body. The second limiting assembly includes a limiting plate, a vertical rod, a threaded sleeve, and a second spring. The limiting plate is detachably connected to the fixed cylinder. A vent hole is provided on the limiting plate. The upper end of the vertical rod is fixedly connected to the limiting plate. The lower end of the vertical rod passes through the internal moving body and extends downwards from the internal moving body. The vertical rod and the internal moving body are in a sealed sliding connection. The lower end of the vertical rod is threadedly connected to the threaded sleeve. The upper end of the second spring is fixedly connected to the limiting plate, and the lower end of the second spring is fixedly connected to the internal moving body.

[0006] When the breathing trainer of this application is in use, under the elastic force of the first spring, the upper end of the outer moving body contacts the lower end of the fixed cylinder, and under the elastic force of the second spring, the outer wall of the inner moving body seals against the conical hole. When the user exhales into the housing through the nozzle, the air pressure in the space above the inner moving body increases, causing the inner and outer moving bodies to move downwards. At this time, the first spring is compressed. When the lower end of the inner moving body contacts the threaded sleeve, the inner moving body stops moving downwards. As the user continues to exhale, the air pressure in the space above the inner moving body continues to increase, and the outer moving body continues to slide downwards, creating a gap between the outer wall of the inner moving body and the conical hole on the outer moving body, forming an airflow channel. The gas in the space flows into the space below the inner moving body through the gap and then exits the shell. The user then inhales, causing the air pressure above the inner moving body to decrease. Under the force of the first spring, the outer moving body moves upward and comes into contact with the inner moving body. Both the inner and outer moving bodies move upward simultaneously, compressing the second spring. When the upper end of the outer moving body contacts the fixed cylinder, it stops sliding upward. As the user continues to inhale, the air pressure above the inner moving body continues to decrease, causing the inner moving body to continue moving upward, creating a gap between the inner and outer moving bodies and forming an airflow channel. Air from the space below the inner moving body flows into the space above the inner moving body through this airflow channel and then enters the user's lungs through the nozzle. As the user continuously overcomes the resistance of the first and second springs to exhale and inhale forcefully, the muscles related to breathing are effectively exercised, which helps improve breathing difficulties, enhances cardiopulmonary function, and facilitates effective expectoration through coughing. Attached Figure Description

[0007] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0008] Figure 1 This is a schematic diagram of the breathing trainer in this application when it is not in use.

[0009] Figure 2 yes Figure 1 Enlarged view of section A.

[0010] Figure 3 yes Figure 1 Sectional view of AA.

[0011] Figure 4 This is a schematic diagram of the structure when using this breathing trainer for exhalation training.

[0012] Figure 5 This is a schematic diagram of the structure when using this breathing trainer for inhalation training.

[0013] The meanings of the labels in the attached drawings are as follows: shell-10; external moving body-201; conical hole-2010; internal moving body-202; fixed cylinder-2031; limiting ring-2032; first spring-2033; limiting plate-2041; vertical rod-2042; threaded sleeve-2043; second spring-2044; vent-2045; vertical hole-301; transverse slide-302; sliding column-303; groove-304; elastic vibrating plate-305; third spring-306; bottom cover-401; exhaust hole-402; elastic ring-50; airflow channel-60; air nozzle-70. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0017] like Figures 1 to 3 As shown, the breathing trainer of this embodiment includes a housing 10 and a trainer body disposed in the housing 10.

[0018] The housing 10 is a vertically arranged circular cylinder with openings at both ends. The upper end of the housing 10 is provided with an air nozzle 70 for easy inhalation and exhalation by the user. The air nozzle 70 can be connected to the housing 10 by means of easy installation and disassembly, such as threaded connection or snap-fit. The lower end of the housing 10 is threadedly connected to a bottom cover 401. The bottom cover 401 is provided with a plurality of exhaust holes 402 that connect the inner and outer spaces of the housing 10.

[0019] The training device body includes an outer moving body 201 that is slidably connected to the housing 10, an inner moving body 202 that is movably engaged with the outer moving body 201, a first limiting component for restricting the movement state of the outer moving body 201, and a second limiting component for restricting the movement state of the inner moving body 202.

[0020] The external moving body 201 is disposed inside the housing 10. The external moving body 201 is cylindrical in shape. The outer wall of the external moving body 201 is slidably connected to the inner wall of the housing 10. The external moving body 201 is provided with a conical hole 2010. The conical hole 2010 penetrates the external moving body 201 along the axial direction of the external moving body 201. The large end of the conical hole 2010 is close to the upper end of the housing 10, and the small end of the conical hole 2010 faces the lower end of the housing.

[0021] The first limiting component includes a fixed cylinder 2031, a limiting ring 2032, and a first spring 2033. The fixed cylinder 2031 is cylindrical and is vertically disposed above the external moving body 201. The fixed cylinder 2031 is located inside the housing 10 and is fixedly connected to the housing 10. The inner wall of the fixed cylinder 2031 is provided with internal threads. The upper and lower ends of the fixed cylinder 2031 are open. An elastic ring 50 is fixedly connected to the lower end of the fixed cylinder 2031 to prevent the external moving body 201 from directly colliding with the fixed cylinder 2031 when sliding inside the housing 10.

[0022] The limiting ring 2032 is disposed below the external moving body 201. The limiting ring 2032 is an annular plate adapted to the inner wall of the housing 10. The lower inner wall of the housing 10 is provided with an internal thread, and the outer wall of the limiting ring 2032 is provided with an external thread that mates with the internal thread on the lower inner wall of the housing 10. The limiting ring 2032 is threadedly connected to the housing 10. The first spring 2033 is vertically disposed. The lower end of the first spring 2033 is fixedly connected to the limiting ring 2032, and the upper end of the first spring 2033 is fixedly connected to the external moving body 201. Optionally, the lower end of the first spring 2033 is fixedly connected to the limiting ring 2032, and the upper end of the first spring 2033 contacts the external moving body 201. Under the elastic force of the first spring 2033, the external moving body 201 presses upward against the elastic ring 50.

[0023] The inner moving body 202 is a frustum of a cone whose outer wall fits against the conical hole 2010. The height of the inner moving body 202 is less than the height of the outer moving body 201, so that the inner moving body 202 is located inside the conical hole 2010 of the outer moving body 201. A vibration mechanism is provided inside the inner moving body 202. The vibration mechanism includes a vertical hole 301 that penetrates the inner moving body 202 in a vertical direction, a horizontal slide rail 302 that is horizontally arranged and communicates with the vertical hole 301, a slide column 303 that is arranged in the horizontal slide rail 302, a groove 304 that is recessed in the outer wall of the inner moving body 202 and communicates with the vertical hole 301, and an elastic vibrating plate 305 that is arranged in the groove 304.

[0024] like Figure 1 , Figure 2 As shown, the vertical hole 301 is eccentrically disposed on the inner moving body 202. The groove 304 is disposed on the upper middle part of the outer wall of the inner moving body 202 near the vertical hole 301. The groove 304 is a cylindrical groove. The axis of the groove 304 intersects the axis of the inner moving body 202 and is perpendicular to the generatrix of the inner moving body 202. The bottom of the groove 304 communicates with the vertical hole 301. Specifically, a channel is provided in the inner moving body 202 to communicate the groove 304 with the vertical hole 301. The elastic vibrating plate 305 is a circular plate that mates with the inner wall of the groove 304. The outer periphery of 5 is sealed and fixedly connected to the inner wall of the groove 304, so that the elastic vibrating plate 305 closes the groove 304. The axis of the elastic vibrating plate 305 is coaxial with the groove 304, that is, the elastic vibrating plate 305 is inclined so that the axis of the elastic vibrating plate 305 is perpendicular to the generatrix of the conical hole 2010, making the elastic vibrating plate 305 parallel to the generatrix. The parallel arrangement of the elastic vibrating plate 305 and the generatrix of the conical hole 2010 makes it easier to force the elastic vibrating plate 305 to vibrate when gas flows rapidly between the inner wall of the conical hole 2010 and the outer wall of the inner moving body 202.

[0025] The transverse slide 302 is located below the groove 304. The inner diameter of the transverse slide 302 is larger than the inner diameter of the vertical hole 301. The transverse slide 302 is arranged radially along the inner moving body 202. The outer end of the transverse slide 302 penetrates the inner moving body 202, and the inner end of the transverse slide 302 is a blind end. The sliding column 303 is slidably connected to the transverse slide 302. A third spring 306 is provided inside the transverse slide 302. The third spring 306 is horizontally arranged between the sliding column 303 and the inner end of the transverse slide 302. One end of the third spring 306 is fixedly connected to the inner end of the transverse slide 302. The other end of the spring 306 is fixedly connected to the inner end of the slide column 303. The outer end of the slide column 303 is set as a curved surface that mates with the conical hole 2010. When the outer wall of the inner moving body 202 is in contact with the conical hole 2010, the slide column 303 is squeezed back into the transverse slide rail 302 by the conical hole 2010. At this time, the slide column 303 blocks and isolates the vertical hole 301. When the inner moving body 202 and the outer moving body 201 slide relative to each other, causing a gap between the inner moving body 202 and the outer moving body 201, the slide column 303 slides outward from the inner moving body 202 under the elastic force of the third spring 306 until the outer end of the slide column 303 contacts the outer moving body 201.

[0026] The second limiting component includes a limiting plate 2041, a vertical rod 2042, a threaded sleeve 2043, and a second spring 2044. The limiting plate 2041 is generally circular and horizontally arranged. The outer circumferential surface of the limiting plate 2041 is provided with an external thread that mates with the internal thread on the fixed cylinder 2031. The limiting plate 2041 is threadedly connected to the fixed cylinder 2031. The limiting plate 2041 is provided with a vent hole 2045, which penetrates the limiting plate 2041 along its thickness direction.

[0027] The vertical rod 2042 is coaxially arranged with the inner moving body 202. The upper end of the vertical rod 2042 is fixedly connected to the limiting plate 2041. Optionally, the vertical rod 2042 and the limiting plate 2041 are integrally formed. The lower end of the vertical rod 2042 passes through the inner moving body 202 and extends downward from the inner moving body 202. The vertical rod 2042 and the inner moving body 202 are in a sealed sliding connection. The lower end of the vertical rod 2042 is provided with an external thread. The lower end of the vertical rod 2042 is threadedly connected to a threaded sleeve 2043. Rotating the threaded sleeve... The threaded sleeve 2043 can move along the axis of the vertical rod 2042 so that the upper end of the threaded sleeve 2043 contacts the lower end face of the inner moving body 202, thereby limiting the extreme position of the inner moving body 202 sliding down the vertical rod 2042. The second spring 2044 is sleeved on the vertical rod 2042. The upper end of the second spring 2044 is fixedly connected to the limiting plate 2041, and the lower end of the second spring 2044 is fixedly connected to the upper end face of the inner moving body 202.

[0028] When the breathing trainer of this application is in use, under the elastic force of the first spring 2033, the upper end of the outer moving body 201 contacts the lower end of the fixed cylinder 2031, and under the elastic force of the second spring 2044, the outer wall of the inner moving body 202 is sealed and fitted with the conical hole 2010. At this time, the sliding column 303 blocks and isolates the vertical hole 301. Figure 4 As shown, when the user exhales into the housing 10 through the air nozzle 70, the air pressure in the space above the inner moving body 202 increases, causing the inner moving body 202 and the outer moving body 201 to move downwards. At this time, the first spring 2033 is compressed. When the lower end of the inner moving body 202 contacts the threaded sleeve 2043, the inner moving body 202 stops moving downwards. As the user continues to exhale, the air pressure in the space above the inner moving body 202 continues to increase, and the outer moving body 201 continues to slide downwards, causing a gap to appear between the outer wall of the inner moving body 202 and the conical hole 2010 on the outer moving body 201, forming an airflow channel 60. The gas in the space above the inner moving body 202 flows into the space below the outer moving body 201 through the airflow channel 60 and is then discharged outside the housing 10.

[0029] After exhaling, the user inhales, at which point the air pressure above the internal moving body 202 decreases, as... Figure 5 As shown, the outer moving body 201 moves upward under the elastic force of the first spring 2033 and then comes into contact with the inner moving body 202. Both the inner and outer moving bodies 202 and 201 move upward simultaneously, compressing the second spring 2044. When the upper end of the outer moving body 201 contacts the elastic ring 50 below the fixed cylinder 2031, the outer moving body 201 stops sliding upward. As the user continues to inhale, the air pressure above the inner moving body 202 continues to decrease. Under atmospheric pressure, the inner moving body 202 continues to move upward, creating a gap between it and the outer moving body 201, forming an airflow channel 60. Air from the space below the inner moving body 202 flows at high speed into the space above it through this airflow channel 60 and then into the user's lungs via the air nozzle 70. When the user forcefully exhales and inhales, overcoming the resistance of the first spring 2033 and the second spring 2044, the muscles related to breathing are effectively exercised, which is beneficial for the recovery of respiratory muscle function and helps with effective coughing and expectoration.

[0030] When a gap forms between the inner moving body 202 and the outer moving body 201, creating an airflow channel 60, the sliding column 303 slides outward under the elastic force of the third spring 306, causing the vertical hole 301 to open. At this time, the airflow flows at high speed through the airflow channel 60 between the inner moving body 202 and the outer moving body 201, and the airflow also flows through the vertical hole 301. When the high-speed airflow through the airflow channel 60 between the inner moving body 202 and the outer moving body 201 reaches the opening of the groove 304, the cross-section of the airflow channel 60 at the opening of the groove 304 suddenly increases, causing the airflow through the airflow channel 60 to form turbulence at the opening of the groove 304, causing the air pressure at the opening of the groove 304 to change rapidly, resulting in the rapid vibration of the elastic vibrating plate 305, which in turn causes the air in the user's respiratory tract to vibrate, which helps to loosen the phlegm stuck to the respiratory tract wall, making it easier to cough up phlegm. The vertical hole 301 creates turbulence on both sides of the elastic vibrating plate 305 to increase the vibration probability of the elastic vibrating plate 305. The length of the sliding column 303 is set so that when there is no gap between the inner moving body 202 and the outer moving body 201, the sliding column 303 will block the vertical hole 301. The larger the gap between the inner moving body 202 and the outer moving body 201, the larger the conduction area of ​​the vertical hole 301. The vertical hole 301 also makes it easier for the air oscillation caused by the vibration of the elastic vibrating plate 305 to be transmitted to the user's respiratory tract.

[0031] When the external moving body 201 contacts the fixed cylinder 2031, the distance between the limiting plate 2041 and the internal moving body 202 can be adjusted by rotating the vertical rod 2042, thereby adjusting the compression of the second spring 2044 and achieving the purpose of adjusting the suction resistance.

[0032] During the use of this breathing trainer, when the external moving body 201 contacts the fixed cylinder 2031, the distance between the limiting ring 2032 and the external moving body 201 can be adjusted by rotating the limiting ring 2032, thereby adjusting the compression of the first spring 2033 and thus adjusting the resistance during exhalation.

[0033] The breathing trainer of this application has at least the following beneficial effects.

[0034] 1. This breathing trainer combines expiratory and inspiratory training into one device. It has a simple structure, is easy to carry, and can be used by users anytime.

[0035] 2. This breathing trainer is equipped with a vibration mechanism that generates air oscillations through the gas flow during exhalation and inhalation, which in turn causes air oscillations in the user's respiratory tract. This helps to loosen phlegm on the respiratory tract walls, making it easier to cough up phlegm.

[0036] 3. This breathing trainer allows users to adjust the breathing resistance by rotating the vertical rod 2042 and the limiting ring 2032 according to their needs. It is not limited by the adjustment level and is suitable for a wider range of users.

[0037] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A breathing trainer, characterized in that: Includes a housing and a trainer body disposed within the housing; The housing is a cylindrical body with openings at both ends. An air nozzle is provided at the upper end of the housing. The training device body includes an outer moving body that is slidably connected to the housing, an inner moving body that is movably cooperated with the outer moving body, a first limiting component for limiting the movement state of the outer moving body, and a second limiting component for limiting the movement state of the inner moving body. The outer moving body is provided with a conical hole, which penetrates the outer moving body along the axis of the outer moving body. The larger end of the conical hole is close to the upper end of the shell. The inner moving body is a frustum of a cone whose outer wall fits against the conical hole. The first limiting component includes a fixed cylinder, a limiting ring, and a first spring. The fixed cylinder is disposed above the external moving body and fixedly connected to the housing. The limiting ring is disposed below the external moving body and detachably connected to the housing. The lower end of the first spring is fixedly connected to the limiting ring, and the upper end of the first spring is fixedly connected to the external moving body. The second limiting component includes a limiting plate, a vertical rod, a threaded sleeve, and a second spring. The limiting plate is detachably connected to the fixed cylinder. A vent hole is provided on the limiting plate. The upper end of the vertical rod is fixedly connected to the limiting plate, and the lower end of the vertical rod passes through the inner moving body and extends downward from the inner moving body. The vertical rod and the inner moving body are in a sealed sliding connection. The lower end of the vertical rod is threadedly connected to the threaded sleeve. The upper end of the second spring is fixedly connected to the limiting plate, and the lower end of the second spring is fixedly connected to the inner moving body. The inner moving body is provided with a vibration mechanism, which includes a vertical hole penetrating the inner moving body in a vertical direction, a horizontal slide rail connected to the vertical hole, a slide column disposed in the horizontal slide rail, a groove recessed in the outer wall of the inner moving body and connected to the vertical hole, and an elastic vibrating plate disposed in the groove. The transverse slide is arranged radially along the inner moving body, with its outer end penetrating the inner moving body and its inner end being a blind end. The sliding column is sealed and slidably connected to the transverse slide. A third spring is provided inside the transverse slide, with one end of the third spring fixedly connected to the inner end of the transverse slide and the other end of the third spring fixedly connected to the inner end of the sliding column. The outer periphery of the elastic vibrating plate is sealed and fixedly connected to the inner wall of the groove.

2. The breathing trainer as described in claim 1, characterized in that: The inner wall of the fixed cylinder is provided with internal threads, and the outer circumferential surface of the limiting plate is provided with external threads. The limiting plate is threadedly connected to the fixed cylinder.

3. The breathing trainer as described in claim 2, characterized in that: The lower inner wall of the housing is provided with an internal thread, and the outer wall of the limiting ring is provided with an external thread. The limiting ring is threadedly connected to the housing.

4. The breathing trainer as described in claim 3, characterized in that: The elastic vibrating plate is tilted so that it is parallel to the generatrix of the conical hole.

5. The breathing trainer as described in claim 4, characterized in that: The lower end of the housing is threaded to a bottom cover, and the bottom cover is provided with several vent holes.

6. The breathing trainer as described in claim 5, characterized in that: An elastic ring is fixedly connected to the lower end of the fixed cylinder.

Citation Information

Patent Citations

  • Respiratory function training device after lung transplantation

    CN114082161A

  • Simple inspiratory muscle exerciser for thoracic and abdominal operation rehabilitation

    CN115445155A