Knee extension assist device

Abstract

The utility model discloses a kind of knee straightening auxiliary devices, it is related to the technical field of brace, to solve the technical problem that existing knee support does not have passive knee exercise function. The utility model includes elastic collar, the support device is arranged on the elastic collar, the support device includes the first air bag being contacted with knee and the second air bag and third air bag being contacted with popliteal fossa respectively, the first air bag is communicated with the second air bag and third air bag by gas conveying device, the elastic collar is equipped with fixed collar, the gas conveying device is arranged between the fixed collar and elastic collar, the first air bag is connected with inflator. The utility model uses elastic collar, first air bag, second air bag etc., while patient actively exercises knee straightening, passive assistance can be used by first air bag etc., promote patient exercise, improve exercise recovery effect.

Description

Technical Field

[0001] This utility model belongs to the field of brace technology, specifically relating to a knee extension assist device. Background Technology

[0002] In the early stages of stroke (commonly known as hemiplegia), muscle tone is very low, and in most cases, it is flaccid paralysis on one side of the body. To prevent complications such as decreased cardiopulmonary function, limb contractures, and deep vein thrombosis in hemiplegic patients, and also to help patients regain confidence and recover function as soon as possible, postural control training in a standing position is necessary during the flaccid paralysis stage. However, when patients are training in a standing position, due to weakness and reduced or lost sensation, the knee on the affected side cannot be kept in a straight position. This leads to abnormal body alignment and inability to maintain standing balance, exacerbating the patient's fear. This not only affects the recovery effect on the affected side but also affects walking later, thus prolonging the recovery period.

[0003] Therefore, to achieve better walking recovery, it is necessary to encourage patients to perform balance and posture control training and walking training in the early stages while keeping the affected leg upright. Some knee braces are currently available on the market, but these primarily limit the angle of knee rotation to allow the bones and ligaments around the knee to recover; they do not provide an uprighting function. This device requires patients to actively exercise to maintain the flexion or extension of the knee. For hemiplegic patients, passive knee support is also necessary to promote exercise of the affected limb. Utility Model Content

[0004] This utility model discloses a knee extension assist device, which aims to solve the technical problem that the existing knee braces do not have a passive knee exercise function.

[0005] To solve the aforementioned technical problems, the present invention adopts the following technical solution: A knee extension assist device includes an elastic collar with a support device on it. The support device includes a first airbag that contacts the knee and a second and third airbag that respectively contact the popliteal fossa. The first airbag is connected to the second and third airbags via an air supply device. A fixing collar is fitted over the elastic collar, and the air supply device is disposed between the fixing collar and the elastic collar. The first airbag is connected to an inflation device.

[0006] After adopting this technical solution, the elastic collar is fitted onto the patient's affected leg. The elastic collar is designed to fit patients with knees of any size, making the device highly practical.

[0007] The first air bladder on the elastic collar contacts the knee, while the second and third air bladders contact the popliteal fossa. The first air bladder is then inflated. Under the constraint of the fixed collar, the first air bladder can only press against the knee, providing support to the patient's knee and straightening it.

[0008] This device can rhythmically inflate and deflate the first airbag, allowing it to support the knee and thus provide regular knee exercises for the patient. Furthermore, the device can also inflate the first airbag first, allowing the patient to straighten their knee. When the patient needs to bend their knee for walking exercises, the knee compresses the first airbag, transferring the gas from it to the second and third airbags for temporary storage. During knee flexion, gas gradually enters the second and third airbags, which then press against the knee from the popliteal fossa, straightening the knee. Once straightened, the gas is transferred back from the second and third airbags to the first airbag, creating a continuous cycle. This combination of active knee flexion and straightening, along with passive exercises using the first, second, and third airbags, enhances the training effect for hemiplegic patients.

[0009] The gas delivery device includes a first gas delivery pipe and a second gas delivery pipe. The second airbag forms a ring structure with the first airbag through the first gas delivery pipe and is connected to the first airbag through the first gas delivery pipe. The third airbag forms a ring structure with the first airbag through the second gas delivery pipe and is connected to the first airbag through the second gas delivery pipe.

[0010] With this technical solution, the gas delivery device is positioned between the fixed collar and the elastic collar, which protect the first and second gas delivery pipes, ensuring stable gas delivery and guaranteeing the stability of the device during use. The second and third airbags form a ring structure with the first airbag via the first and second gas delivery pipes, respectively, conforming to the ring structure at the knee of the human body for smoother gas delivery.

[0011] The first and second air supply pipes are each provided with a first one-way membrane for allowing the gas in the first airbag to flow unidirectionally to the second and third airbags. The first and second air supply pipes are also provided with a second one-way membrane for allowing the gas in the second and third airbags to flow unidirectionally to the first airbag.

[0012] By adopting this technical solution, a first one-way membrane and a second one-way membrane are installed in the first and second air supply pipes. The gas must reach a fixed pressure to open the channels of the first and second one-way membranes, allowing it to enter the second, third, and first air bladders. The gas then moves rhythmically through the first and second one-way membranes in the first, second, and third air bladders, causing them to expand rhythmically and provide rhythmic support to the knee. This improves the regularity of the device during exercise and achieves better exercise and recovery effects.

[0013] Both the first gas supply pipe and the second gas supply pipe are telescopic structures. The first gas supply pipe includes a first main pipe and a first sub-pipe that are interconnected. The end of the first main pipe is provided with a through hole that mates with the first sub-pipe. A sealing ring is provided in the through hole. A limit ring is provided at the end of the first sub-pipe that slides in the first main pipe.

[0014] With this technical solution, both the first and second air delivery tubes are telescopic structures, extending and retracting with the elastic collar. This allows the second, third, and first air bladders to contact the knees and popliteal fossa of patients with different leg sizes, improving the accuracy of passive exercise. When the first daughter tube slides within the first mother tube, the limiting ring prevents it from slipping out, ensuring stability. A sealing ring is located at the sliding point between the first daughter tube and the first mother tube, providing better sealing performance.

[0015] The fixing collar is an open-loop structure. One end of the fixing collar is provided with a pull ring. One side of the fixing collar is provided with a first hook and loop fastener with a rough surface, and the other side is provided with a first hook and loop fastener with a smooth surface. When one end of the fixing collar without the pull ring passes through the pull ring and is folded back to connect the first hook and loop fastener with the first hook and loop fastener with a smooth surface, a ring structure that can abut against the elastic collar is formed.

[0016] With this technical solution, the smooth and rough surfaces of the first Velcro strap on the fixing collar can accommodate patients with different knee sizes. After adjusting the elastic collar so that the first, second, and third airbags are in contact with the patient's knee and popliteal fossa respectively, the fixing collar is placed on the elastic collar to restrict the elastic collar and the first, second, and third airbags from expanding away from the body. This ensures that the first, second, and third airbags can only expand towards the patient's knee. Therefore, the fixing collar not only improves the practicality of the device but also increases its stability during the expansion of the first, second, and third airbags.

[0017] The inflation device includes an inflation tube disposed on the first airbag, the inflation tube being connected to a sealing joint, and the sealing joint being detachably connected to an inflation electric pump or an inflation hand pump.

[0018] By adopting this technical solution, the inflation tube is placed on the first airbag. The amount of air inflated into the first airbag allows it to expand and come into contact with the knee, assessing the current range of knee extension. This allows the amount of air in the first airbag to be adjusted according to the patient's recovery, enabling step-by-step rehabilitation and improving recovery effectiveness while ensuring patient comfort.

[0019] The elastic collar is connected to a thigh collar and a calf collar by two symmetrically arranged connecting straps.

[0020] By adopting this technical solution, the design of the thigh and calf loops can improve the stability of the device when connected to the patient's leg, thereby enhancing the stability of the device during use.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: (1) Elastic rings, first airbags, second airbags, etc. can be used to passively assist the patient's exercise while the patient actively exercises to straighten his knee, thereby promoting the patient's exercise and improving the exercise recovery effect.

[0022] (2) A second airbag and a first air delivery tube are used to form a ring structure with the first airbag, which fits the shape of the human knee and makes the gas transport smoother.

[0023] (3) The first and second air supply tubes with telescopic structure can extend and retract with the elastic collar, so that the second and third air bladders and the first air bladder can contact the knees and popliteal fossa of different patients, thereby improving the accuracy of passive exercise.

[0024] (4) An open-loop fixing ring is adopted. The setting of the fixing ring not only improves the practicality of the device, but also increases the stability of the device when each airbag is inflated. Attached Figure Description

[0025] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This utility model provides a structural schematic diagram of a knee extension assist device; Figure 2 This is a schematic diagram showing the connection between the gas delivery device and the first airbag, the second airbag, and the third airbag. Figure 3 This is a schematic diagram of the first gas pipeline; Figure 4 This is a schematic diagram showing the connection between the thigh collar, calf collar, and this device.

[0026] Figure Labels

[0027] 1-Fixing collar, 2-Elastic collar, 3-First airbag, 301-Inflation tube, 4-Second airbag, 5-Third airbag, 6-First air supply tube, 601-First main tube, 602-Limiting ring, 603-First daughter tube, 7-Second air supply tube, 8-First one-way membrane, 9-Second one-way membrane, 10-Thigh collar, 11-Lower leg collar, 12-Connecting belt. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] The following is combined Figures 1-4 This utility model will be described in detail. Example 1

[0031] A knee extension assist device, such as Figures 1 to 4 As shown, the device includes an elastic collar 2, on which a support device is provided. The support device includes a first airbag 3 that contacts the knee and a second airbag 4 and a third airbag 5 that respectively contact the popliteal fossa. The first airbag 3 is connected to the second airbag 4 and the third airbag 5 through an air supply device. A fixing collar 1 is provided outside the elastic collar 2. The air supply device is provided between the fixing collar 1 and the elastic collar 2. The first airbag 3 is connected to an inflation device.

[0032] In this embodiment, the elastic collar 2 is made of elastic band, and the elastic collar 2 is provided with mounting holes that cooperate with the first airbag 3, the second airbag 4, and the third airbag 5. The first airbag 3, the second airbag 4, and the third airbag 5 pass through the mounting holes and are placed inside the elastic collar 2.

[0033] In this embodiment, the gas delivery device is sandwiched in the interlayer between the fixed collar 1 and the elastic collar 2.

[0034] In this embodiment, the second airbag 4 and the third airbag 5 are in contact with the upper sides of the popliteal fossa, that is, the side closer to the thigh and the side closer to the calf. This position can better support the knee from the popliteal fossa side.

[0035] In this embodiment, the first airbag 3, the second airbag 4, and the third airbag 5 are all made of thermoplastic polyurethane. Thermoplastic polyurethane has high elasticity and excellent impact resistance.

[0036] The elastic collar 2 is fitted onto the patient's affected leg. The elastic collar 2 is designed to fit any knee size, making the device highly practical.

[0037] The first airbag 3 on the elastic collar 2 contacts the knee, and the second airbag 4 and the third airbag 5 contact the popliteal fossa respectively. Then the first airbag 3 is inflated. Under the restriction of the fixed collar 1, the first airbag 3 can only press against the knee when it expands, and supports the patient's knee from the knee to straighten the knee.

[0038] This device can rhythmically inflate and deflate the first airbag 3, allowing it to support the knee and thus provide regular knee exercises for the patient. Furthermore, the device can also inflate the first airbag 3 first, allowing the patient to straighten their knee through it. When the patient needs to bend their knee for walking exercises, the knee compresses the first airbag 3, causing the gas inside to be transferred through a gas delivery device to the second airbag 4 and the third airbag 5 for temporary storage. During knee flexion, gas gradually enters the second and third airbags 4 and 5, which then press against the knee from the popliteal fossa, straightening the knee. After straightening, the gas is transferred back from the second and third airbags 4 and 5 to the first airbag 3, creating a continuous cycle. By relying on the patient's active knee flexion and straightening combined with passive exercises using the first, second, and third airbags 3 and 5, the exercise effect for hemiplegic patients is significantly improved.

[0039] In this embodiment, the gas delivery device includes a first gas delivery pipe 6 and a second gas delivery pipe 7. The second airbag 4 forms an annular structure with the first airbag 3 through the first gas delivery pipe 6 and is connected to the first airbag 3 through the first gas delivery pipe 6. The third airbag 5 forms an annular structure with the first airbag 3 through the second gas delivery pipe 7 and is connected to the first airbag 3 through the second gas delivery pipe 7.

[0040] In this embodiment, both the first gas supply pipe 6 and the second gas supply pipe 7 are made of rubber, which has good elasticity and sealing performance, and can swing within a certain range without leakage.

[0041] In this embodiment, when the gas is compressed and flows through the first gas supply pipe 6 and the second gas supply pipe 7 into the first air bladder 3, the second air bladder 4 and the third air bladder 5, the flow speed is very fast. When the patient is recovering well and can walk normally, the gas can keep up with the flexion and extension movements of the patient's knee and cooperate smoothly with the patient's knee.

[0042] In this embodiment, the first air supply pipe 6 is sealed and bonded to the second airbag 4 and the first airbag 3, and the second air supply pipe 7 is sealed and bonded to the third airbag 5 and the first airbag 3.

[0043] The air delivery device is positioned between the fixed collar 1 and the elastic collar 2, which protect the first air delivery pipe 6 and the second air delivery pipe 7, ensuring stable air delivery and guaranteeing the stability of the device during use. The second airbag 4 and the third airbag 5 form a ring structure with the first airbag 3 through the first air delivery pipe 6 and the second air delivery pipe 7, respectively. This ring structure conforms to the ring-shaped structure at the knee of the human body, allowing for smoother air delivery.

[0044] In this embodiment, both the first gas supply pipe 6 and the second gas supply pipe 7 are provided with a first one-way membrane 8 for allowing the gas in the first airbag 3 to flow unidirectionally to the second airbag 4 and the third airbag 5. The first gas supply pipe 6 and the second gas supply pipe 7 are also provided with a second one-way membrane 9 for allowing the gas in the second airbag 4 and the third airbag 5 to flow unidirectionally to the first airbag 3. In other embodiments, the one-way membrane can be replaced with a one-way valve; controlling the connection between the airbags through the valve would provide a more stable connection.

[0045] In this embodiment, two of each of the first unidirectional membrane 8 and the second unidirectional membrane 9 are provided, and the two first unidirectional membranes 8 and the two second unidirectional membranes 9 are all disposed on the same side. Figure 2 As shown.

[0046] In this embodiment, the first one-way membrane 8 and the second one-way membrane 9 have the same communication direction. The structure and working principle of the first one-way membrane 8 and the second one-way membrane 9 are existing technologies. Only after reaching a certain pressure can the first one-way membrane 8 and the second one-way membrane 9 bend, revealing the channel between the first one-way membrane 8 and the second one-way membrane 9, so that gas can flow from the first airbag 3 to the second airbag 4 and the third airbag 5, and from the second airbag 4 and the third airbag 5 to the first airbag 3.

[0047] In this embodiment, the first one-way membrane 8 and the second one-way membrane 9 are sealed and bonded to the first gas delivery pipe 6 and the second gas delivery pipe 7.

[0048] A first one-way membrane 8 and a second one-way membrane 9 are installed in the first air supply pipe 6 and the second air supply pipe 7, so that the gas must reach a fixed pressure to open the channels of the first one-way membrane 8 and the second one-way membrane 9, and enter the second airbag 4, the third airbag 5 and the first airbag 3 through the channels. The gas is regularly transferred in the first airbag 3, the second airbag 4 and the third airbag 5 through the first one-way membrane 8 and the second one-way membrane 9, so that the first airbag 3, the second airbag 4 and the third airbag 5 expand regularly, providing regular support to the knee, thereby improving the regularity of the device during exercise and achieving better exercise recovery effect.

[0049] In this embodiment, both the first gas supply pipe 6 and the second gas supply pipe 7 are telescopic structures. The first gas supply pipe 6 includes a first main pipe 601 and a first sub-pipe 603 that are interconnected. The end of the first main pipe 601 is provided with a through hole that cooperates with the first sub-pipe 603. A sealing ring is provided in the through hole. A limit ring 602 is provided at the end of the first sub-pipe 603 that slides in the first main pipe 601.

[0050] In this embodiment, the first gas supply pipe 6 and the second gas supply pipe 7 have the same structure.

[0051] In this embodiment, the end near the second airbag 4 and the third airbag 5 is a telescopic sub-tube of the corresponding air supply tube, such as... Figure 2 As shown, the end furthest from the second airbag 4 and the third airbag 5 is a telescopic main tube, and the first one-way membrane 8 and the second one-way membrane 9 are both disposed in the telescopic main tube.

[0052] In this embodiment, the sealing ring is bonded to the through hole, and the limiting ring 602 is sleeved on the end of the first sub-tube 603 and then bonded to the first sub-tube 603.

[0053] Both the first air inlet tube 6 and the second air inlet tube 7 are telescopic structures, extending and retracting with the elastic collar 2. This allows the second airbag 4, the third airbag 5, and the first airbag 3 to contact the knees and popliteal fossa of patients with different leg sizes, improving the accuracy of passive exercise. When the first sub-tube 603 slides within the first main tube 601, the limiting ring 602 prevents it from slipping out, ensuring sliding stability. A sealing ring is located at the sliding point between the first sub-tube 603 and the first main tube, providing better sealing performance.

[0054] In this embodiment, the fixing collar 1 is an open-loop structure. One end of the fixing collar 1 is provided with a pull ring. One side of the fixing collar 1 is provided with a first hook and loop fastener surface, and the other side is provided with a first hook and loop fastener smooth surface. When the end of the fixing collar 1 without the pull ring passes through the pull ring and is folded back to connect the first hook and loop fastener surface and the first hook and loop fastener smooth surface, a ring structure that can abut against the elastic collar 2 is formed.

[0055] In this embodiment, the fixing collar 1 is made of polyester fiber, and the pull ring is sewn to the fixing collar 1.

[0056] In this embodiment, both the rough side and the hook side of the first hook and loop fastener are sewn to the fixing collar 1.

[0057] The smooth and rough sides of the first Velcro strap on the fixing collar 1 can accommodate patients with different knee sizes. After adjusting the elastic collar 2 so that the first airbag 3, second airbag 4, and third airbag 5 are in contact with the patient's knee and popliteal fossa respectively, the fixing collar 1 is placed on the elastic collar 2 to restrict the elastic collar 2 and the first airbag 3, second airbag 4, and third airbag 5 from expanding away from the body. This ensures that the first airbag 3, second airbag 4, and third airbag 5 can only expand towards the patient's knee. Therefore, the fixing collar 1 not only improves the practicality of the device but also increases its stability when the first airbag 3, second airbag 4, and third airbag 5 expand.

[0058] In this embodiment, the inflation device includes an inflation tube 301 disposed on the first airbag 3, the inflation tube 301 is connected to a sealing joint, and the sealing joint is detachably connected to an inflation electric pump or an inflation hand pump.

[0059] In this embodiment, the inflation tube 301 is sealed and bonded to the first airbag 3, and the sealing joint is sealed and bonded to the inflation tube 301. In this embodiment, an inflation pump is used to inflate the first airbag 3.

[0060] By placing the inflation tube 301 on the first airbag 3, the first airbag 3 can be inflated and brought into contact with the knee by the amount of air inflated into it. This allows for the assessment of the current range of knee extension angles. Based on the patient's recovery, the amount of air in the first airbag 3 can be adaptively changed to achieve step-by-step rehabilitation, thereby improving the recovery effect while ensuring the patient's comfort.

[0061] The specific method of using this utility model is as follows: Reference Figures 1-4 When using this device, first, the elastic collar 2 is put on the patient's affected knee, so that the first airbag 3 is aligned with the knee, and the second airbag 4 and the third airbag 5 are aligned with the two sides of the popliteal fossa. The first air supply tube 6 and the second air supply tube 7 can change the overall length of the first air supply tube 6 and the second air supply tube 7 by extending and retracting the first daughter tube 603 in the first mother tube 601, so as to match the position of the patient's knee and popliteal fossa.

[0062] After the positions of the elastic collar 2, the first airbag 3, the second airbag 4, and the third airbag 5 are all adjusted, pass the end of the fixing collar 1 without the pull ring through the end with the pull ring, so that the fixing collar 1 is fitted onto the outside of the elastic collar 2 and abuts against the elastic collar 2. Then, stick the first Velcro rough surface and the first Velcro smooth surface on the fixing collar 1 together to complete the entire preparation work.

[0063] The first airbag 3 is inflated using a charging pump through the inflation tube 301. The expansion of the first airbag 3 compresses the knee, straightening it. The first airbag 3 can be regularly inflated and deflated through the inflation tube 301 to achieve the exercise effect of regularly straightening the knee. Alternatively, after the first airbag 3 is filled with a certain amount of air, the inflation tube 301 can be sealed. The pressure of the knee on the first airbag 3 causes the gas to be transferred through the first one-way membrane 8 to the second airbag 4 and the third airbag 5, and from the second airbag 4 and the third airbag 5 to the first airbag 3 through the second one-way membrane 9. This, combined with the patient's active straightening and bending, passively improves the exercise effect of the knee. Example 2

[0064] This embodiment is basically the same as Embodiment 1, except that: in this embodiment, as shown in the example... Figure 4 As shown, the elastic collar 2 is connected to the thigh collar 10 and the calf collar 11 by two symmetrically arranged connecting straps 12.

[0065] In this embodiment, the thigh collar 10 and the calf collar 11 are made of the same material as the elastic collar 2. The thigh collar 10 and the calf collar 11 are provided with a fixing ring that is the same as the fixing collar 1 to fix the position of the thigh collar 10 and the calf collar.

[0066] The thigh collar 10 and calf collar 11 enhance the stability of the device when connected to the patient's leg, thereby improving the stability of the device during use.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A knee extension assist device, characterized in that: The device includes an elastic collar (2), on which a support device is provided. The support device includes a first airbag (3) that contacts the knee and a second airbag (4) and a third airbag (5) that respectively contact the popliteal fossa. The first airbag (3) is connected to the second airbag (4) and the third airbag (5) through an air supply device. A fixed collar (1) is provided on the outer sleeve of the elastic collar (2). The air supply device is provided between the fixed collar (1) and the elastic collar (2). The first airbag (3) is connected to an inflation device. The gas delivery device includes a first gas delivery pipe (6) and a second gas delivery pipe (7). The second airbag (4) forms a ring structure with the first airbag (3) through the first gas delivery pipe (6) and is connected to the first airbag (3) through the first gas delivery pipe (6). The third airbag (5) forms a ring structure with the first airbag (3) through the second gas delivery pipe (7) and is connected to the first airbag (3) through the second gas delivery pipe (7). Both the first gas supply pipe (6) and the second gas supply pipe (7) are provided with a first one-way membrane (8) for allowing the gas in the first airbag (3) to flow unidirectionally to the second airbag (4) and the third airbag (5). The first gas supply pipe (6) and the second gas supply pipe (7) are also provided with a second one-way membrane (9) for allowing the gas in the second airbag (4) and the third airbag (5) to flow unidirectionally to the first airbag (3).

2. The knee extension assist device according to claim 1, characterized in that: Both the first gas supply pipe (6) and the second gas supply pipe (7) are telescopic structures. The first gas supply pipe (6) includes a first main pipe (601) and a first daughter pipe (603) that are interconnected. The end of the first main pipe (601) is provided with a through hole that cooperates with the first daughter pipe (603). A sealing ring is provided in the through hole. The end of the first daughter pipe (603) that slides in the first main pipe (601) is provided with a limit ring (602).

3. A knee extension assistive device according to any one of claims 1-2, characterized in that: The fixing collar (1) is an open-loop structure. One end of the fixing collar (1) is provided with a pull ring. One side of the fixing collar (1) is provided with a first hook and loop fastener surface, and the other side is provided with a first hook and loop fastener smooth surface. When one end of the fixing collar (1) without the pull ring passes through the pull ring and is folded back to connect the first hook and loop fastener surface and the first hook and loop fastener smooth surface, a ring structure that can abut against the elastic collar (2) is formed.

4. A knee extension assistive device according to any one of claims 1-2, characterized in that: The inflation device includes an inflation tube (301) disposed on the first airbag (3), the inflation tube (301) is connected to a sealing joint, and the sealing joint is detachably connected to an inflation electric pump or an inflation hand pump.

5. A knee extension assistive device according to any one of claims 1-2, characterized in that: The elastic collar (2) is connected to the thigh collar (10) and the calf collar (11) respectively by two symmetrically arranged connecting straps (12).

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