An adjustable backrest for use by people with hunchback

By designing an adjustable backrest that is easy for hunchback patients to use, and utilizing an airbag system and a limiting structure, the problem of hunchback patients lying flat and falling off the CT examination bed has been solved, thus achieving both convenience and safety in CT examinations.

CN224269328UActive Publication Date: 2026-05-26CANCER HOSPITAL AFFILIATED TO GUANGXI MEDICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CANCER HOSPITAL AFFILIATED TO GUANGXI MEDICAL UNIV
Filing Date
2025-04-09
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing CT scan examination bed has a horizontal structure, which makes it inconvenient for hunchbacked patients to lie flat and poses a risk of falling.

Method used

An adjustable backrest was designed for use by patients with kyphosis. The back, waist and hip airbags are inflated to different heights to fit the patient’s body through the main diverter and airbag system. The L-shaped frame and limiting airbags are used to limit the position and prevent the patient from falling.

Benefits of technology

It enables hunchback patients to lie flat and be positioned within the CT examination bed, solving the discomfort and risk of falling during CT examinations and improving the convenience of the examination.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses an adjustable backrest that is convenient for hunchback patients to use, relating to the field of medical device technology. The utility model includes a placement board, a main body component on top of the placement board, and anti-fall-off components on both sides of the placement board. This utility model supplies air to the back airbag, waist airbag, and hip airbag respectively through a back diverter, a waist diverter, and a hip diverter, causing the back airbag, waist airbag, and hip airbag to inflate to different heights. This allows the back airbag, waist airbag, and hip airbag to fit against the back, waist, and hip of the hunchback patient, respectively, enabling the hunchback patient to lie flat on the CT examination table. This solves the problem of existing technologies making it inconvenient for hunchback patients to lie flat. The L-shaped frame and second mounting plate drive the movement of the limiting airbags, which in turn limit the movement of the hunchback patient's waist on both sides, solving the problem of existing technologies failing to prevent the patient from falling off the examination table.
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Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to an adjustable backrest that is convenient for hunchback patients to use. Background Technology

[0002] Medical devices refer to instruments, equipment, devices, in vitro diagnostic reagents and calibrators, materials and other similar or related objects that are used directly or indirectly on the human body for diagnosis and treatment, including the necessary computer software. Among them, CT scanners are one of the most common medical devices, which use X-ray beams to perform tomographic scanning of the human body and use computer processing to generate detailed images of the body's internal structure.

[0003] A CT scanner mainly consists of a scanning gantry system, an X-ray generation system, a data acquisition system, a computer and array processor, an operating table and image display system, and a scanning examination bed. The scanning examination bed is mainly used to transport patients. However, because the existing scanning examination beds are horizontal in structure, it is inconvenient for some hunchbacked patients to lie on the examination bed, which not only affects the CT scan but also makes the hunchbacked patients feel uncomfortable.

[0004] To address these issues, we provide an adjustable backrest that is easy for hunchback patients to use. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable backrest that is convenient for hunchback patients. Air is supplied to the back airbag, waist airbag, and hip airbag respectively through a main diffuser, back diffuser, waist diffuser, and hip diffuser, causing the back airbag, waist airbag, and hip airbag to inflate to different heights. This allows the back airbag, waist airbag, and hip airbag to fit against the back, waist, and hip of the hunchback patient, respectively, enabling the patient to lie flat on the CT examination table. This solves the problem of existing technologies making it inconvenient for hunchback patients to lie flat on the CT examination table. Simultaneously, the L-shaped frame and second mounting plate drive the movement of the limiting airbags, which limit the movement of the patient's waist on both sides, solving the problem of existing technologies failing to prevent patients from falling off the examination table.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is an adjustable backrest that is convenient for hunchback patients to use. It includes a placement board, a main body component for assisting hunchback patients to lie flat is provided on the top of the placement board, and anti-fall components for preventing hunchback patients from falling are provided on both sides of the placement board. The main body component includes multiple first mounting plates fixedly connected to the upper surface of the placement board and a main distributor fixedly connected to the center of the lower surface of the placement board. A back airbag, a waist airbag and a hip airbag are respectively bonded to the upper surface of the multiple first mounting plates. The air outlet of the main distributor is fixedly connected to a first connecting pipe. The end of the first connecting pipe away from the main distributor is fixedly connected to the back distributor, the waist distributor and the hip distributor respectively. The air outlet of the back distributor, the waist distributor and the hip distributor are all fixedly connected to a second connecting pipe. The end of the second connecting pipe away from the back distributor, the waist distributor and the hip distributor is fixedly connected to the air inlet of the back airbag, the waist airbag and the hip airbag respectively.

[0008] The anti-fall-off component includes multiple mounting frames fixedly connected to both sides of the upper surface of the placement plate. Each mounting frame is movably connected to an L-shaped frame. The top of the horizontal support arm of the L-shaped frame is fixedly connected to a second mounting plate. Limiting airbags are glued to the sides of the second mounting plates that are close to each other. The air inlet end of the limiting airbag is fixedly connected to a second air inlet pipe.

[0009] A further feature of this invention is that a fixing rod is fixedly connected to both sides of the lower surface of the first mounting plate, and the end of the fixing rod away from the first mounting plate extends to the bottom of the placement plate and is threaded with a fastening nut.

[0010] A further feature of this invention is that: a first exhaust pipe is fixedly connected to one side of each of the back airbag, waist airbag, and hip airbag; a first exhaust shell is fixedly connected to one end of each of the first exhaust pipes away from the back airbag, waist airbag, and hip airbag; a first threaded plug is threadedly connected to the opening of each of the first exhaust shells; and a first screw cap is fixedly connected to one end of each of the first threaded plugs located outside the first exhaust shell.

[0011] A further feature of this invention is that a second exhaust pipe is fixedly connected to the other side of the back airbag, waist airbag, and hip airbag. The end of the second exhaust pipe away from the back airbag, waist airbag, and hip airbag is fixedly connected to the same third exhaust pipe. Both ends of the third exhaust pipe are threaded with pipe caps.

[0012] A further feature of this invention is that the air inlet end of the main distributor is fixedly connected to a first air inlet pipe.

[0013] A further feature of this invention is that: a movable plate is movably connected inside the mounting frame; a connecting rod is fixedly connected to the front and rear ends of one side outer wall of the movable plate; the end of the connecting rod away from the movable plate movably passes through one side outer wall of the mounting frame and is fixedly connected to the front and rear ends of the vertical support arm of the L-shaped frame; a return spring is fixedly connected to the other side outer wall of the movable plate; the end of the return spring away from the movable plate is fixedly connected to the other side inner wall of the mounting frame.

[0014] A further feature of this invention is that: the top of each of the horizontal support arms of the L-shaped frame is fixedly connected to a mounting bracket, and the vertical support arms of the mounting bracket are respectively fixedly connected to the front and rear ends of the outer wall of the second mounting plate on the side away from the limiting airbag.

[0015] A further feature of this invention is that: the air outlet of the limiting airbag is fixedly connected to a fourth exhaust pipe, the end of the fourth exhaust pipe away from the limiting airbag is fixedly connected to a second exhaust shell, the opening of the second exhaust shell is internally threaded with a second threaded plug, and the end of the second threaded plug located outside the second exhaust shell is fixedly connected to a second screw cap.

[0016] This utility model has the following beneficial effects:

[0017] 1. This utility model, through the setting of the main component, connects the main distributor to an air source such as an air pump through the first air inlet pipe. The air source supplies air to the main distributor through the air pump, and the air enters the back distributor, waist distributor, and hip distributor through the first connecting pipe. Through the second connecting pipe, the air in the back distributor, waist distributor, and hip distributor enters the back airbag, waist airbag, and hip airbag respectively. Thus, the back airbag, waist airbag, and hip airbag fit against the back, waist, and hip of the hunchback patient, respectively, allowing the hunchback patient to lie flat on the CT examination bed, which facilitates the CT examination for the hunchback patient.

[0018] 2. This utility model incorporates an anti-fall-off component. Air is supplied to the limiting airbag via an air pump or other air source, causing the limiting airbag to inflate. Then, the second mounting plate is pulled away from the placement plate, which in turn moves the limiting airbag. When the hunchbacked patient lies flat on the CT examination table, the second mounting plate is released. At this time, under the action of the return spring, the limiting airbag moves back to its initial position, allowing the limiting airbags to fit against both sides of the hunchbacked patient's waist. This effectively limits the hunchbacked patient's position, preventing them from falling off the examination table during the CT examination and facilitating the CT examination of hunchbacked patients.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a structural schematic diagram of the main components of this utility model.

[0023] Figure 3 This is a lower view of the first mounting plate of this utility model.

[0024] Figure 4 This is a structural disassembly diagram of the waist airbag of this utility model.

[0025] Figure 5 This is a schematic diagram of the installation of the waist airbag and the third exhaust pipe of this utility model.

[0026] Figure 6 This is a schematic diagram of the main distributor of this utility model.

[0027] Figure 7 This is a schematic diagram of the anti-fall-off component of this utility model.

[0028] Figure 8 This is a structural disassembly diagram of the mounting frame and L-shaped bracket of this utility model.

[0029] Figure 9 This is a structural disassembly diagram of the second mounting plate and the limiting airbag of this utility model.

[0030] Figure 10 This is the gas path diagram of this utility model.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1-Placement plate, 2-Main body assembly, 201-First mounting plate, 201a-Fixing rod, 201b-Fasting nut, 202-Back airbag, 202a-First exhaust pipe, 202b-First exhaust shell, 202c-First threaded plug, 202d-First screw cap, 202e-Second exhaust pipe, 203-Waist airbag, 204-Hip airbag, 205-Main diffuser, 205a-First intake pipe, 205b-First connecting pipe, 206-Back diffuser, 206a-Second connecting pipe Pipe, 207-Waist Flow Diverter, 208-Hip Flow Diverter, 209-Third Exhaust Pipe, 209a-Pipe Cap, 3-Anti-Drop-Off Assembly, 301-Mounting Frame, 301a-Reset Spring, 302-L-Shaped Frame, 302a-Moving Plate, 302b-Connecting Rod, 303-Second Mounting Plate, 303a-Mounting Bracket, 304-Limiting Airbag, 304a-Second Intake Pipe, 304b-Fourth Exhaust Pipe, 304c-Second Exhaust Shell, 304d-Second Threaded Plug, 304e-Second Rotary Cap. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 10As shown, this is the first embodiment of the present invention. This embodiment provides an adjustable backrest for use by hunchback patients, including a placement board 1. Above the placement board 1 is a main body component 2 for assisting hunchback patients to lie flat. The main body component 2 includes a first mounting plate 201, a back airbag 202, a lumbar airbag 203, a hip airbag 204, a main diverter 205, a back diverter 206, a lumbar diverter 207, and a hip diverter 208. The back airbag 202, lumbar airbag 203, and hip airbag 204 are connected by the main diverter 205, the back diverter 206, and the lumbar diverter 207. The air duct 207 and the hip shunt 208 supply air to the back airbag 202, the waist airbag 203 and the hip airbag 204 respectively, causing the back airbag 202, the waist airbag 203 and the hip airbag 204 to inflate to different heights. This allows the back airbag 202, the waist airbag 203 and the hip airbag 204 to fit against the back, waist and hip of the hunchback patient respectively, so that the hunchback patient can lie flat on the CT examination table, solving the problem that the existing technology is not convenient for hunchback patients to lie flat on the CT examination table.

[0036] Specifically, multiple first mounting plates 201 are provided and fixedly connected to the upper surface of the placement plate 1. A back airbag 202, a waist airbag 203, and a hip airbag 204 are respectively bonded to the upper surface of each of the multiple first mounting plates 201. A main diffuser 205 is fixedly connected to the center of the lower surface of the placement plate 1. The outlet end of each main diffuser 205 is fixedly connected to a first connecting pipe 205b. The end of the first connecting pipe 205b away from the main diffuser 205 is fixedly connected to a back diffuser 206, a waist diffuser 207, and a hip diffuser 208, respectively. The back diffuser 206, waist diffuser 207, and hip diffuser 208... The air outlets of the back airbag 207 and the hip airbag 208 are both fixedly connected to a second connecting pipe 206a. One end of the second connecting pipe 206a, away from the back airbag 206, the waist airbag 207, and the hip airbag 208, is fixedly connected to the air inlet of the back airbag 202, the waist airbag 203, and the hip airbag 204, respectively. The first mounting plate 201 is used to mount the back airbag 202, the waist airbag 203, and the hip airbag 204 on the placement plate 1. The back airbag 202, the waist airbag 203, and the hip airbag 204 are respectively used to provide air to the back, waist, and hip of the hunchback patient. The system provides support, and the back airbag 202, waist airbag 203, and hip airbag 204 are all equipped with pressure-sensing structures, such as pressure sensors, to control airbag deformation. The main distributor 205 is connected to an external air pump or other air source to supply air to the back distributor 206, waist distributor 207, and hip distributor 208. The first connecting pipe 205b is used to connect the main distributor 205 with the back distributor 206, waist distributor 207, and hip distributor 208, and a solenoid valve is also provided on the first connecting pipe 205b. Air is supplied to the back airbag 202, waist airbag 203, and hip airbag 204 by the back airbag 207 and hip airbag 208, respectively, causing them to expand and deform. The second connecting pipe 206a is provided to connect the back airbag 206, waist airbag 207, and hip airbag 208 with the back airbag 202, waist airbag 203, and hip airbag 204. A solenoid valve is also provided on the second connecting pipe 206a, and the solenoid valve on the second connecting pipe 206a is electrically connected to the pressure sensing structure in the corresponding back airbag 202, waist airbag 203, and hip airbag 204.

[0037] Furthermore, fixing rods 201a are fixedly connected to both sides of the lower surface of the first mounting plate 201. The end of the fixing rod 201a away from the first mounting plate 201 extends to the bottom of the placement plate 1 and is threaded with a fastening nut 201b.

[0038] One side of each of the back airbag 202, waist airbag 203 and hip airbag 204 is fixedly connected to a first exhaust pipe 202a. The end of the first exhaust pipe 202a away from the back airbag 202, waist airbag 203 and hip airbag 204 is fixedly connected to a first exhaust shell 202b. The opening of the first exhaust shell 202b is threadedly connected to a first threaded plug 202c. The end of the first threaded plug 202c located outside the first exhaust shell 202b is fixedly connected to a first screw cap 202d.

[0039] The other side of the back airbag 202, waist airbag 203 and hip airbag 204 are all fixedly connected to a second exhaust pipe 202e. The end of the second exhaust pipe 202e away from the back airbag 202, waist airbag 203 and hip airbag 204 is fixedly connected to the same third exhaust pipe 209. Both ends of the third exhaust pipe 209 are threaded with pipe caps 209a.

[0040] The main splitter 205 is fixedly connected to the first intake pipe 205a at its intake end.

[0041] The operation process of this embodiment is as follows: Place the placement plate 1 on the CT examination bed and let the hunchback patient lie down. Then, connect the main shunt 205 to an external air source such as an air pump through the first air inlet pipe 205a. The air source such as the air pump supplies air into the main shunt 205. The air enters the back shunt 206, waist shunt 207 and hip shunt 208 through the first connecting pipe 205b respectively. And through the second connecting pipe 206a, the air in the back shunt 206, waist shunt 207 and hip shunt 208 enters the back airbag 202, waist airbag 203 and hip airbag 204 respectively. Thus, the back airbag 202, waist airbag 203 and hip airbag 204 are respectively attached to the back, waist and hip of the hunchback patient, so that the hunchback patient lies flat on the CT examination bed.

[0042] Example 2

[0043] Please see Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs from the previous embodiment in that: anti-fall components 3 are also provided on both sides of the placement plate 1 to prevent hunchbacked patients from falling. The anti-fall components 3 include a mounting frame 301, an L-shaped frame 302, a second mounting plate 303, and a limiting airbag 304. The L-shaped frame 302 and the second mounting plate 303 drive the limiting airbag 304 to move, and the limiting airbag 304 limits the waist sides of the hunchbacked patient, solving the problem that the prior art is not convenient to prevent patients from falling off the examination table.

[0044] Specifically, the mounting frame 301 is provided with multiple frames and fixedly connected to both sides of the upper surface of the placement plate 1. Each side of the mounting frame 301 is movably connected to an L-shaped frame 302. The top of the horizontal support arm of the L-shaped frame 302 is fixedly connected to a second mounting plate 303. Each side of the second mounting plates 303 that is close to each other is bonded with a limiting airbag 304. The air inlet end of the limiting airbag 304 is fixedly connected to a second air inlet pipe 304a.

[0045] Furthermore, a movable plate 302a is movably connected inside the mounting frame 301. Connecting rods 302b are fixedly connected to the front and rear ends of one side outer wall of the movable plate 302a. The end of the connecting rod 302b away from the movable plate 302a movably passes through one side outer wall of the mounting frame 301 and is fixedly connected to the front and rear ends of the vertical support arm of the L-shaped frame 302. A return spring 301a is fixedly connected to the other side outer wall of the movable plate 302a. The end of the return spring 301a away from the movable plate 302a is fixedly connected to the other side inner wall of the mounting frame 301.

[0046] The top of the horizontal support arm of the L-shaped frame 302 is fixedly connected to the mounting bracket 303a, and the vertical support arm of the mounting bracket 303a is fixedly connected to the front and rear ends of the outer wall of the second mounting plate 303 on the side away from the limiting airbag 304.

[0047] The air outlet of the limiting airbag 304 is fixedly connected to a fourth exhaust pipe 304b. The end of the fourth exhaust pipe 304b away from the limiting airbag 304 is fixedly connected to a second exhaust shell 304c. The opening of the second exhaust shell 304c is internally threaded with a second threaded plug 304d. The end of the second threaded plug 304d located outside the second exhaust shell 304c is fixedly connected to a second swivel cap 304e.

[0048] The rest of the structure is the same as in Example 1.

[0049] The operation process of this embodiment is as follows: air is supplied to the limiting airbag 304 by an air source such as an air pump, so that the limiting airbag 304 inflates. Then, the second mounting plate 303 is pulled away from the placement plate 1, which in turn causes the second mounting plate 303 to move the limiting airbag 304. When the hunchback patient lies flat on the CT examination table, the second mounting plate 303 is released. At this time, under the action of the return spring 301a, the limiting airbag 304 moves back to the initial position, so that the limiting airbag 304 fits against both sides of the waist of the hunchback patient, thereby limiting the hunchback patient.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. An adjustable backrest for facilitating the use of a backrest by a humpbacked patient, comprising a placement plate (1), characterized in that: The placement plate (1) is provided with a main component (2) for assisting hunchback patients to lie flat, and anti-fall components (3) are provided on both sides of the placement plate (1) to prevent hunchback patients from falling. The main component (2) includes multiple first mounting plates (201) fixedly connected to the upper surface of the placement plate (1) and a main diverter (205) fixedly connected to the center of the lower surface of the placement plate (1). The upper surfaces of the multiple first mounting plates (201) are respectively bonded with a back airbag (202), a waist airbag (203) and a hip airbag (204). The air outlet of the main diverter (205) is fixedly connected to a first connecting pipe (205b). The end of the first connecting pipe (205b) away from the main diverter (205) is fixedly connected to a back diverter (206), a waist diverter (207) and a hip diverter (208). The back diverter (206) The air outlets of the waist diverter (207) and hip diverter (208) are all fixedly connected to a second connecting pipe (206a), and the end of the second connecting pipe (206a) away from the back diverter (206), waist diverter (207) and hip diverter (208) is fixedly connected to the air inlet of the back airbag (202), waist airbag (203) and hip airbag (204) respectively; the anti-fall-off component (3) includes a fixed Multiple mounting frames (301) are connected to both sides of the upper surface of the placement plate (1), and an L-shaped frame (302) is movably connected to one side of each mounting frame (301). A second mounting plate (303) is fixedly connected to the top of the horizontal support arm of the L-shaped frame (302), and a limiting airbag (304) is glued to the side of the second mounting plates (303) that are close to each other. The air inlet end of the limiting airbag (304) is fixedly connected to a second air inlet pipe (304a).

2. The adjustable backrest cushion of claim 1, wherein, The lower surface of the first mounting plate (201) is fixedly connected to both sides of a fixing rod (201a), and the end of the fixing rod (201a) away from the first mounting plate (201) extends to the bottom of the placement plate (1) and is threaded with a fastening nut (201b).

3. The adjustable backrest cushion of claim 1, wherein, One side of each of the back airbag (202), waist airbag (203), and hip airbag (204) is fixedly connected to a first exhaust pipe (202a), and the end of the first exhaust pipe (202a) away from the back airbag (202), waist airbag (203), and hip airbag (204) is fixedly connected to a first exhaust shell (202b). The opening of the first exhaust shell (202b) is threaded with a first threaded plug (202c), and the end of the first threaded plug (202c) located outside the first exhaust shell (202b) is fixedly connected with a first screw cap (202d).

4. The adjustable backrest cushion of claim 3, wherein, The other side of the back airbag (202), waist airbag (203) and hip airbag (204) are all fixedly connected to a second exhaust pipe (202e), and the end of the second exhaust pipe (202e) away from the back airbag (202), waist airbag (203) and hip airbag (204) is fixedly connected to the same third exhaust pipe (209), and the openings at both ends of the third exhaust pipe (209) are threaded with pipe caps (209a).

5. The adjustable backrest cushion of claim 1, wherein, The main distributor (205) is fixedly connected to the first intake pipe (205a) at its intake end.

6. The adjustable backrest cushion of claim 1, wherein, The mounting frame (301) is internally connected to a movable plate (302a), and a connecting rod (302b) is fixedly connected to the front and rear ends of one side outer wall of the movable plate (302a). The end of the connecting rod (302b) away from the movable plate (302a) movably passes through one side outer wall of the mounting frame (301) and is fixedly connected to the front and rear ends of the vertical support arm of the L-shaped frame (302). A return spring (301a) is fixedly connected to the other side outer wall of the movable plate (302a), and the end of the return spring (301a) away from the movable plate (302a) is fixedly connected to the other side inner wall of the mounting frame (301).

7. The adjustable backrest cushion of claim 1, wherein, The top of the horizontal support arm of the L-shaped frame (302) is fixedly connected to the mounting bracket (303a), and the vertical support arm of the mounting bracket (303a) is fixedly connected to the front and rear ends of the outer wall of the second mounting plate (303) away from the limiting airbag (304).

8. The adjustable backrest cushion of claim 7, wherein, The air outlet of the limiting airbag (304) is fixedly connected to a fourth exhaust pipe (304b), and the end of the fourth exhaust pipe (304b) away from the limiting airbag (304) is fixedly connected to a second exhaust shell (304c). The opening of the second exhaust shell (304c) is internally threaded with a second threaded plug (304d), and the end of the second threaded plug (304d) located outside the second exhaust shell (304c) is fixedly connected to a second swivel cap (304e).