Wrist joint brace

Abstract

The invention discloses a wrist joint brace which comprises an upper fixing plate, a lower fixing plate and a connecting piece, the connecting piece is used for connecting the upper fixing plate and the lower fixing plate, an annular cavity is formed between the upper fixing plate and the lower fixing plate, an annular air bag is arranged in the annular cavity and connected with an inflation and deflation device, and the inflation and deflation device is connected with a control module. A pressure detection device is arranged on the surface of the annular air bag and connected with the control module. According to the wrist joint brace, the pressure of the annular air bag on the wrist joint of the human body is monitored in real time through the pressure detection device, the fixing state of the wrist joint brace can be adjusted in time, the occurrence rate of complications / disability is effectively avoided, the operation, treatment and rehabilitation effects are guaranteed, and the pain of a patient is relieved; the value of pressure applied to the wrist joint position of the patient by a doctor is expected, standardization and scientization of the wearing and fixing tightness degree of the wrist joint brace are facilitated, and the comfort degree of the patient is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a wrist joint brace. Background Art

[0002] Wrist braces are auxiliary fixation medical tools that all patients with wrist injuries must wear after surgery, and they play a very important role in the patient's postoperative recovery. During the use of traditional wrist braces, the affected limb will be wrapped by the brace and cannot be disassembled at will, and the tightness of the brace cannot be adjusted. However, the wound after wrist surgery is usually accompanied by symptoms such as swelling and fever. During the recovery process, as the wound changes, the swelling degree and limb temperature of the affected limb will also change. For example, the brace fixation becomes loose after the swelling subsides, and the swelling increases, causing the brace fixation to become tighter. If the tightness of the brace cannot be adjusted in time according to the changes in the affected limb, it will affect the surgical effect and postoperative rehabilitation process: too tight fixation affects the blood return of the limb and causes swelling of the limb distal to the brace. If the compression cannot be relieved in time, tissue edema will continue to worsen and cause necrosis of muscle blood vessels and nerves; too loose fixation cannot effectively fix the patient and cannot create stable conditions for wound healing. In severe cases, it may even cause inflammation to intensify, collision and friction leading to severe pain, muscle atrophy, etc.

[0003] Prior art CN219070855U discloses a wrist joint fixation brace, including a brace, a first fixing belt fixed on the brace at one end, a second fixing belt fixed on the brace at one end, a third fixing belt fixed on the brace at one end, a first fixing assembly arranged on the brace, a second fixing assembly arranged on the brace, and a third fixing assembly arranged on the brace, wherein the structures of the first fixing assembly to the third fixing assembly are the same; the first fixing assembly comprises a first block fixed on the brace, a second block fixed on the first block, and a clamping assembly arranged on the second block and used to clamp the first fixing belt. The wrist joint fixation brace can fix the patient's hand, wrist and arm, thereby having a good fixing effect, and a plurality of fixing belts are provided, and the ventilation effect is good; the fixing belt can be quickly adjusted in tightness through the fixing assembly, thereby providing convenience. The wrist joint fixation brace of the above patent adopts the method of pulling the fixing belt to adjust the tightness, which is troublesome to operate, and the tightness of the brace cannot be standardized, which affects the patient's comfort and rehabilitation process. Summary of the invention

[0004] The purpose of the present invention is to provide a wrist joint brace to solve the above problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a wrist joint brace, comprising an upper fixing plate, a lower fixing plate and a connecting piece, wherein the connecting piece is used to connect the upper fixing plate and the lower fixing plate, the upper fixing plate and the lower fixing plate are arranged relative to each other so that an annular cavity is formed between the upper fixing plate and the lower fixing plate, an annular airbag for fixing the human wrist joint is provided in the annular cavity, the annular airbag is connected to an inflation and deflation device, the inflation and deflation device is connected to a control module, a pressure detection device is provided on the surface of the annular airbag close to the human hand, the pressure detection device is connected to the control module, and the control module is used to control the working state of the inflation and deflation device based on the pressure information detected by the pressure detection device, and dynamically adjust the pressure of the annular airbag on the human wrist joint.

[0006] As an optional implementation of the above technical solution, the annular airbag includes an upper arc airbag and a lower arc airbag, the upper arc airbag is arranged on the inner side of the upper fixed plate, and the lower arc airbag is arranged on the inner side of the lower fixed plate, the upper arc airbag and the lower arc airbag are both connected to the inflation and deflation device, and the surfaces of the upper arc airbag and the lower arc airbag are provided with pressure detection devices.

[0007] As an optional implementation of the above technical solution, both ends of the upper arc-shaped airbag are provided with upper expanding portions expanding outward, and both ends of the lower arc-shaped airbag are provided with lower expanding portions expanding outward.

[0008] As an optional implementation of the above technical solution, an upper arc-shaped fitting surface is provided on the inner side of the upper arc-shaped airbag, and the upper arc-shaped fitting surface fits with the human hand, and a pressure detection device is provided on the surface of the upper arc-shaped fitting surface.

[0009] As an optional implementation of the above technical solution, a lower arc-shaped fitting surface is provided on the inner side of the lower arc-shaped airbag, and the lower arc-shaped fitting surface fits with the human hand, and a pressure detection device is provided on the surface of the lower arc-shaped fitting surface.

[0010] As an optional implementation of the above technical solution, the connecting member includes a connecting strap, one side of the upper fixing plate is connected to one side of the lower fixing plate by at least two connecting straps, and the other side of the upper fixing plate is connected to the other side of the lower fixing plate by at least two connecting straps.

[0011] As an optional implementation of the above technical solution, the side wall of the upper fixing plate is provided with an upper fixing buckle, the side wall of the lower fixing plate is provided with a lower fixing buckle, and the connecting strap is ring-shaped and is sleeved on the upper fixing buckle and the lower fixing buckle.

[0012] As an optional implementation of the above technical solution, the control module includes a protective shell and a control main board, the protective shell is fixed on the upper fixed plate, the control main board is arranged inside the protective shell, and the pressure detection device and the inflation and deflation device are both connected to the control main board.

[0013] As an optional implementation of the above technical solution, the inflation and deflation device includes an air pump, which is connected to the control main board. An air intake pipe is provided between the air pump and the annular airbag, an air intake port is provided at one end of the air intake pipe, an air intake valve is provided on the air intake pipe, and the air intake valve is connected to the control main board; the annular airbag is connected to an exhaust pipe, an exhaust port is provided at one end of the exhaust pipe, an exhaust valve is provided on the exhaust pipe, and the exhaust valve is connected to the control main board.

[0014] As an optional implementation of the above technical solution, the air pump is connected to a power supply device.

[0015] As an optional implementation of the above technical solution, the power supply device includes a power supply battery, the power supply battery is connected to the air pump, and the power supply battery is equipped with a charging interface module.

[0016] As an optional implementation of the above technical solution, the power supply battery is a lithium battery.

[0017] As an optional implementation of the above technical solution, a plurality of temperature detection devices are provided at intervals on the surface of the annular airbag close to the human hand, and the temperature detection devices are connected to the control module, and the control module is connected to an alarm.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a wrist brace, which monitors the pressure of an annular airbag on the human wrist joint in real time through a pressure detection device, and can adjust the fixing state of the wrist brace in time, effectively avoiding the incidence of complications / disability, ensuring the effects of surgery, treatment and rehabilitation, and alleviating the pain of patients. In addition, the annular airbag adjusts the pressure value through inflation and deflation actions to achieve the doctor's expectation of the pressure value applied to the patient's wrist joint position, which is conducive to achieving the standardization and scientificization of the tightness of the wrist brace and improving the comfort of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of a wrist brace in one embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the exploded structure of a wrist brace in one embodiment of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a control module in one embodiment of the present invention.

[0023] In the figure: 1-upper fixing plate; 2-lower fixing plate; 3-control module; 4-upper arc-shaped airbag; 5-lower arc-shaped airbag; 6-connecting strap; 7-upper fixing buckle; 8-lower fixing buckle; 9-protective shell; 10-control main board; 11-air pump; 12-intake pipe; 13-charging interface module; 14-lithium battery; 15-alarm. DETAILED DESCRIPTION

[0024] like Figure 1-Figure 3 As shown, this embodiment provides a wrist brace, including an upper fixing plate 1, a lower fixing plate 2 and a connecting piece, the upper fixing plate 1 and the lower fixing plate 2 are both in the shape of an arc, and in order to reduce the weight of the wrist brace, the upper fixing plate 1 and the lower fixing plate 2 are both made of plastic. The connecting piece is used to connect the upper fixing plate 1 and the lower fixing plate 2, and the upper fixing plate 1 and the lower fixing plate 2 are arranged relative to each other so that an annular cavity is formed between the upper fixing plate 1 and the lower fixing plate 2, the upper fixing plate 1 is located above the lower fixing plate 2, and an annular cavity is provided between the upper fixing plate 1 and the lower fixing plate 2 so that the human hand can be inserted into the annular cavity.

[0025] The annular cavity is provided with an annular airbag for fixing the human wrist joint, and the annular airbag is connected to an inflation and deflation device, so that the human hand can be directly inserted into the annular airbag to fix the wrist joint. The inflation and deflation device is used to inflate and deflate the annular airbag, thereby adjusting the wrapping pressure of the annular airbag on the human hand, and realizing the tightness adjustment function of the wrist joint brace.

[0026] like Figure 1 As shown, the inflation and deflation device is connected to a control module 3, and a pressure detection device is provided on the surface of the side of the annular airbag close to the human hand. The pressure detection device is connected to the control module 3. The control module 3 is used to control the working state of the inflation and deflation device based on the pressure information detected by the pressure detection device, and dynamically adjust the pressure of the annular airbag on the human wrist joint. The pressure detection device uses a pressure sensor to detect the pressure between the annular airbag and the human hand in real time. The pressure sensor transmits the pressure information between the annular airbag and the human hand to the control module 3. The control module 3 controls the working state of the inflation and deflation device, and dynamically adjusts the pressure of the annular airbag on the human wrist joint, thereby adjusting the tightness of the wrist brace.

[0027] During specific use, when the pressure detection data of the pressure sensor is too large, the wrist brace is too tight, and the annular airbag is deflated to reduce the gas in the annular airbag, thereby reducing the pressure of the annular airbag on the human wrist joint and making the wrist brace looser; when the pressure detection data of the pressure sensor is too small, the wrist brace is too loose, and the annular airbag is inflated to increase the gas in the annular airbag, thereby increasing the pressure of the annular airbag on the human wrist joint and making the wrist brace tighter.

[0028] The present invention monitors the pressure of the annular airbag on the human wrist joint in real time through a pressure detection device, and can adjust the fixation state of the wrist brace in time, effectively avoiding the incidence of complications / disability, ensuring the effects of surgery, treatment and rehabilitation, and alleviating the patient's pain. In addition, the annular airbag adjusts the pressure value through inflation and deflation actions to achieve the doctor's expectation of the pressure value applied to the patient's wrist joint position, which is conducive to achieving the standardization and scientificization of the tightness of the wrist brace and improving the comfort of the patient.

[0029] like Figure 1 and Figure 2 As shown, specifically, the annular airbag includes an upper arc-shaped airbag 4 and a lower arc-shaped airbag 5, the upper arc-shaped airbag 4 is arranged on the inner side of the upper fixed plate 1, and the lower arc-shaped airbag 5 is arranged on the inner side of the lower fixed plate 2, the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5 are both connected to the inflation and deflation device, and the surfaces of the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5 are both provided with a pressure detection device. Among them, the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5 can be directly or indirectly connected to the inflation and deflation device, so that the inflation and deflation device inflates and deflates the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5 at the same time. As a consistent optional embodiment, the inflation and deflation device is connected to the upper arc-shaped airbag 4, and the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5 are connected through a pipeline, the inflation and deflation device fills the gas into the upper arc-shaped airbag 4, and the upper arc-shaped airbag 4 then fills the gas into the lower arc-shaped airbag 5, so as to realize the simultaneous inflation and deflation of the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5.

[0030] In order to facilitate the wearing of the wrist brace, both ends of the upper arc-shaped airbag 4 are provided with an upper flared portion that expands outward, and both ends of the lower arc-shaped airbag 5 are provided with a lower flared portion that expands outward. An upper arc-shaped fitting surface is provided on the inner side of the upper arc-shaped airbag 4, and the upper arc-shaped fitting surface is fitted with the human hand, and a pressure detection device is provided on the surface of the upper arc-shaped fitting surface. A lower arc-shaped fitting surface is provided on the inner side of the lower arc-shaped airbag 5, and the lower arc-shaped fitting surface is fitted with the human hand, and a pressure detection device is provided on the surface of the lower arc-shaped fitting surface. The pressure detection device of the upper arc-shaped airbag 4 detects the pressure of the upper arc-shaped airbag 4 on the human wrist joint, and the pressure detection device of the lower arc-shaped airbag 5 detects the pressure of the lower arc-shaped airbag 5 on the human wrist joint. The control module 3 controls the working state of the inflation and deflation device based on the pressure information detected by the two pressure detection devices, so as to realize the simultaneous inflation and deflation function of the upper arc-shaped airbag 4 and the lower arc-shaped airbag 5.

[0031] like Figure 1As shown, in a specific embodiment, the connecting member includes a connecting strap 6, one side of the upper fixing plate 1 is connected to one side of the lower fixing plate 2 by at least two connecting straps 6, and the other side of the upper fixing plate 1 is connected to the other side of the lower fixing plate 2 by at least two connecting straps 6. Preferably, the side wall of the upper fixing plate 1 is provided with an upper fixing buckle 7, and the side wall of the lower fixing plate 2 is provided with a lower fixing buckle 8, and the connecting strap 6 is annular and sleeved on the upper fixing buckle 7 and the lower fixing buckle 8. The upper fixing plate 1 and the lower fixing plate 2 maintain a suitable distance so that the human hand can be inserted into the annular airbag, so that the annular airbag wraps and fixes the wrist joint.

[0032] like Figure 3 As shown, in a specific embodiment, the control module 3 includes a protective shell 9 and a control main board 10, the protective shell 9 is fixed on the upper fixing plate 1, the control main board 10 is arranged inside the protective shell 9, and the pressure detection device and the inflation and deflation device are both connected to the control main board 10. Specifically, the inflation and deflation device includes an air pump 11, the air pump 11 is connected to the control main board 10, an air intake pipe 12 is provided between the air pump 11 and the annular airbag, an air intake port is provided at one end of the air intake pipe 12, an air intake valve is provided on the air intake pipe 12, and the air intake valve is connected to the control main board 10; the annular airbag is connected to an exhaust pipe, an exhaust port is provided at one end of the exhaust pipe, an exhaust valve is provided on the exhaust pipe, and the exhaust valve is connected to the control main board 10.

[0033] Air holes are provided on the protective shell 9 for air intake and exhaust. Both the air intake valve and the exhaust valve are solenoid valves. When the pressure detection data of the pressure sensor is too large, the annular airbag needs to be deflated, and the control main board 10 opens the exhaust valve to exhaust air, thereby reducing the gas in the annular airbag, reducing the pressure of the annular airbag on the human wrist joint, and making the wrist brace looser; when the pressure detection data of the pressure sensor is too small, the annular airbag needs to be inflated, and the control main board 10 opens the air intake valve, and starts the air pump 11, and inflates the annular airbag through the air intake pipe 12, increasing the gas in the annular airbag, increasing the pressure of the annular airbag on the human wrist joint, and making the wrist brace tighter. The present invention avoids the defects of the existing wrist brace after wearing, such as the brace is too tight, which makes the patient uncomfortable to wear and easily affects the blood circulation of the affected limb, and the brace is too loose, which cannot effectively fix the wrist joint, affecting the surgical treatment effect and slowing down the rehabilitation process.

[0034] The air pump 11 is connected to a power supply device, which supplies power to the air pump 11, the control mainboard 10 and other electronic components. Specifically, the power supply device includes a power supply battery, which is connected to the air pump 11 and is equipped with a charging interface module 13. Preferably, the power supply battery is a lithium battery 14, which can be recharged and used repeatedly, thereby improving the convenience of using the wrist brace.

[0035] In a specific embodiment, a plurality of temperature detection devices are provided at intervals on the surface of one side of the annular airbag close to the human hand, and the temperature detection device is connected to the control module 3, and the control module 3 is connected to the alarm 15. The temperature detection device uses a temperature sensor, which can realize real-time monitoring of the temperature data of the affected limb, and combined with pressure data monitoring, it can track the biological data of the postoperative treatment and rehabilitation of the wrist joint.

[0036] The present invention provides a wrist brace, which solves the problem that the affected limb cannot be monitored in real time after wearing the brace, and can send out an alarm signal when the brace is too tight, too loose or the temperature of the affected limb is abnormal. The fixation state of the brace is adjusted in time by inflating and deflating the annular airbag, so as to realize 24-hour real-time monitoring of the healing and changes of the wound after wrist surgery, that is, under the real-time monitoring of the pressure sensor and the temperature sensor, the following functions are realized: tracking the postoperative / treatment / rehabilitation effect of the wrist joint, real-time detection / monitoring of biological data of the affected limb; timely warning, alarm functions of abnormal conditions such as abnormal pressure value, abnormal temperature value, etc., and timely adjustment of the fixation of the brace to avoid complications / disability incidence and ensure the fixation effect.

[0037] The present invention adds a real-time monitoring function for pressure data, which improves the problem that the tightness of traditional wrist braces cannot be standardized when worn and the wearing comfort is poor; through the set temperature detection device, real-time monitoring of the temperature data of the affected limb is realized, and combined with the pressure data monitoring, biological data tracking of the postoperative treatment and rehabilitation of the wrist joint can be carried out; it has a timely early warning function, and through real-time monitoring of pressure and temperature, the alarm function of abnormal pressure and temperature can be realized, and the fixing state of the brace can be adjusted in time, effectively avoiding the incidence of complications / disability, ensuring the effect of surgery, treatment and rehabilitation, and alleviating the pain of patients.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] (1) The present invention avoids the shortcomings of existing wrist braces, such as the inability to standardize the tightness of the brace during wearing, resulting in poor wearing comfort and inability to ensure the fixation effect. For example, if the brace is too tight, the patient will feel uncomfortable wearing it, which may affect the blood circulation of the affected limb; if the brace is too loose, it will not effectively fix the wrist joint, affecting the surgical treatment effect and slowing down the recovery process.

[0040] (2) The surface of the annular airbag of the present invention close to the human hand is provided with a pressure detection device, which detects the binding tightness of the brace in real time through the pressure detection device, so as to standardize the wearing and fixing tightness of the wrist brace and improve the comfort of the patient. This process is a standardized process with simple operation and no skill requirements for service personnel. It does not require professional manual execution, effectively reduces the service costs of hospitals, doctors and technicians, and ensures the wearing comfort of patients, effectively avoiding problems caused by wearing comfort and fixing effect.

[0041] (3) The present invention realizes real-time monitoring of the temperature data of the affected limb through the temperature detection device. Combined with the pressure data monitoring, it can track the biological data of the postoperative treatment and rehabilitation of the wrist joint, thus avoiding the disadvantage that after the wrist brace is worn, the affected limb is covered by the brace and the temperature change of the affected limb cannot be monitored.

[0042] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A wrist brace, characterized in that: The invention comprises an upper fixing plate (1), a lower fixing plate (2) and a connecting piece, wherein the connecting piece is used to connect the upper fixing plate (1) and the lower fixing plate (2), the upper fixing plate (1) and the lower fixing plate (2) are arranged relative to each other so that an annular cavity is formed between the upper fixing plate (1) and the lower fixing plate (2), wherein an annular air bag for fixing a human wrist joint is arranged in the annular cavity, wherein the annular air bag is connected to an inflation and deflation device, wherein the inflation and deflation device is connected to a control module (3), wherein a pressure detection device is arranged on a side surface of the annular air bag close to a human hand, wherein the pressure detection device is connected to the control module (3), and the control module (3) is used to control the working state of the inflation and deflation device based on pressure information detected by the pressure detection device, and dynamically adjust the pressure of the annular air bag on the human wrist joint.

2. The wrist brace according to claim 1, characterized in that: The annular airbag comprises an upper arc-shaped airbag (4) and a lower arc-shaped airbag (5), wherein the upper arc-shaped airbag (4) is arranged on the inner side of the upper fixing plate (1), and the lower arc-shaped airbag (5) is arranged on the inner side of the lower fixing plate (2), and the upper arc-shaped airbag (4) and the lower arc-shaped airbag (5) are both connected to the inflation and deflation device, and the surfaces of the upper arc-shaped airbag (4) and the lower arc-shaped airbag (5) are both provided with a pressure detection device.

3. The wrist brace according to claim 2, characterized in that: Both ends of the upper arc-shaped airbag (4) are provided with upper expanding portions that expand outwards, and both ends of the lower arc-shaped airbag (5) are provided with lower expanding portions that expand outwards.

4. The wrist brace according to claim 2, characterized in that: An upper arc-shaped fitting surface is provided on the inner side of the upper arc-shaped airbag (4), and the upper arc-shaped fitting surface is fitted with a human hand, and a pressure detection device is provided on the surface of the upper arc-shaped fitting surface; a lower arc-shaped fitting surface is provided on the inner side of the lower arc-shaped airbag (5), and the lower arc-shaped fitting surface is fitted with a human hand, and a pressure detection device is provided on the surface of the lower arc-shaped fitting surface.

5. The wrist brace according to claim 1, characterized in that: The connecting member comprises a connecting strap (6), one side of the upper fixing plate (1) is connected to one side of the lower fixing plate (2) via at least two connecting straps (6), and the other side of the upper fixing plate (1) is connected to the other side of the lower fixing plate (2) via at least two connecting straps (6).

6. The wrist brace according to claim 5, characterized in that: The side wall of the upper fixing plate (1) is provided with an upper fixing buckle (7), the side wall of the lower fixing plate (2) is provided with a lower fixing buckle (8), and the connecting strap (6) is ring-shaped and sleeved on the upper fixing buckle (7) and the lower fixing buckle (8).

7. The wrist brace according to claim 1, characterized in that: The control module (3) comprises a protective shell (9) and a control main board (10); the protective shell (9) is fixed on the upper fixing plate (1); the control main board (10) is arranged inside the protective shell (9); and the pressure detection device and the inflation and deflation device are both connected to the control main board (10).

8. The wrist brace according to claim 7, characterized in that: The inflation and deflation device comprises an air pump (11), the air pump (11) is connected to the control main board (10), an air intake pipe (12) is arranged between the air pump (11) and the annular air bag, an air intake port is arranged at one end of the air intake pipe (12), an air intake valve is arranged on the air intake pipe (12), and the air intake valve is connected to the control main board (10); the annular air bag is connected to an exhaust pipe, an exhaust port is arranged at one end of the exhaust pipe, an exhaust valve is arranged on the exhaust pipe, and the exhaust valve is connected to the control main board (10).

9. The wrist brace according to claim 8, characterized in that: The air pump (11) is connected to a power supply device; the power supply device comprises a power supply battery, the power supply battery is connected to the air pump (11), and the power supply battery is equipped with a charging interface module (13); the power supply battery is a lithium battery (14).

10. The wrist brace according to claim 1, characterized in that: A plurality of temperature detection devices are arranged at intervals on the surface of one side of the annular airbag close to the human hand. The temperature detection devices are connected to a control module (3), and the control module (3) is connected to an alarm (15).

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