Knee joint exercise device and method

Abstract

The invention provides a knee joint exercising device and method, belongs to the technical field of exercising equipment, and aims to solve the technical problem that during knee joint exercising, a user only passively cooperates and does not actively exert force. Comprising a chair seat body, a self-adaptive expansion piece and a knee protection frame fixedly connected to the self-adaptive expansion piece, the self-adaptive expansion piece comprises a piston cylinder, a piston rod and a force measuring rod; a piston head of the piston rod is slidably connected into the piston cylinder, a balance channel is arranged on the piston head, and the on-off state of the balance channel is switched by the position of the force measuring rod; the dynamometric rod is slidably connected in the piston rod, one side of the tail end of the piston rod is connected with a knee protection frame, and one side of the piston head is provided with an abutting body; an elastic column is arranged on the cavity wall penetrating through the balance channel and the abutting cavity, and when the abutting body slides in the abutting cavity, the position of the elastic column can be extruded and changed. And a recovery mechanism for automatically recovering the initial position of the abutting body is also arranged. The active leg lifting action of the user is tracked and supported, and the initiative of exercise is enhanced.

Description

Technical Field

[0001] This invention relates to the field of exercise equipment technology, specifically to a knee joint exercise device and method. Background Technology

[0002] The knee joint, as the core joint of the human lower limb, connects the femur and tibia, supports the weight of the body, and participates in various movements such as walking, running, and jumping.

[0003] In various situations, such as knee injuries, post-operative recovery, or age-related joint degeneration, scientific knee exercises are necessary. These exercises aim to enhance joint stability, flexibility, and the strength of surrounding muscles to promote knee rehabilitation and functional recovery.

[0004] However, most existing knee joint exercise aids or caregiver training methods adopt a passive mode, where the mechanical device or caregiver drives the joint to move, and the user merely cooperates passively. While this training mode can help joint movement to some extent, the lack of active effort from the user often limits the training effect, and may even hinder the user's own rehabilitation process due to over-reliance on external force. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention proposes a knee joint exercise device and method to solve the technical problem that the user only passively cooperates during knee joint exercise and lacks the user's active force.

[0006] The technical solution adopted in this invention is a knee joint exercise device and method.

[0007] One knee joint exercise device includes a chair seat with a cushion, a knee brace and an adaptive telescopic device. The knee brace is used to fix the lower leg and is also fixedly connected to the extended end of the adaptive telescopic device. Different telescopic amounts correspond to different lower leg bending angles. The adaptive telescoping mechanism includes: an arc-shaped piston cylinder, a piston rod, and a force-measuring rod; The piston head of the piston rod is slidably connected to the piston cylinder, dividing the piston cylinder cavity into a first pressure zone and a second pressure zone. The piston head is provided with a balance channel that can connect the first pressure zone and the second pressure zone. The on / off state of the balance channel is switched by the position of the force measuring rod. The force measuring rod is slidably connected to the piston rod, and is connected to the knee brace on one side of the piston rod tail end. It is provided with an abutment body on one side of the piston head, and the piston head is provided with an abutment cavity for the abutment body to slide in. An elastic column is provided in the cavity wall between the balance channel and the abutment cavity. When the abutment body slides in the abutment cavity, it can squeeze and change the position of the elastic column. The initial position of the abutting body is located at the point of contact with the elastic column. At this time, the balance channel is disconnected. A recovery mechanism is provided between the piston rod and the force measuring rod, which automatically returns to the initial position when no external force is applied.

[0008] Optionally, the recovery mechanism is located at one end of the piston tail, and the tail end of the piston rod is provided with a cavity. A first elastic element is provided in the cavity, one end of the first elastic element abuts against the bottom of the cavity hole, and the other end abuts against the knee brace.

[0009] Optionally, the knee brace and the force measuring rod are detachably connected, and after disassembly, the first elastic element with different elasticity can be replaced between the knee brace and the force measuring rod.

[0010] Optionally, the elastic column includes a column body and a second elastic element. The column body is slidably installed in the abutment hole. The abutment hole passes through the cavity wall between the abutment cavity and the balance channel, passes through the balance channel, and forms a blind hole on the wall of the balance channel. The column body is provided with a guide structure on the side facing the piston head, and the other side abuts against the bottom of the blind hole through the second elastic element.

[0011] Optionally, multiple sets of the balance channel, elastic column, and abutment hole are arranged along the circumference of the piston rod, and the abutment body is spherical.

[0012] Optionally, the contact area between the arcuate apex of the abutment body and the elastic column is a plane or a cylindrical surface.

[0013] Optionally, the seat body is a wheelchair, the adaptive telescoping device is located under the seat cushion, and the piston rod and force measuring rod of the adaptive telescoping device face forward of the wheelchair.

[0014] Optionally, the knee brace includes a frame body and a strap. The frame body is arc-shaped, supporting the calf muscle on the inner side and connected to the force measuring rod of the adaptive telescopic device on the outer side. The straps are located on opposite sides of the arc of the frame body and are used to fix the lower legs to the frame body.

[0015] Optionally, each of the first pressure zone and the second pressure zone is provided with a pipeline, and the ends of the pipelines are respectively connected to airbags.

[0016] One knee joint exercise method, using a knee joint exercise device as described above, includes the following steps: In the initial step, the abutting body presses against the elastic column, and the elastic column closes the balance channel; In the leg-raising exercise, the force measuring rod is pulled up by the knee brace and slides relative to the piston rod. The abutment of the force measuring rod is misaligned with the elastic column, the elastic column pops out, the balance channel is connected, and the force measuring rod pulls the piston rod to slide along the piston cylinder. When the leg-raising exercise stops, the force measuring rod loses tension and returns to its initial position, the abutment body presses against the elastic column to close the balance channel, and the piston rod remains in its original position.

[0017] As can be seen from the above technical solution, the beneficial technical effects of the present invention are as follows: This knee joint exercise device incorporates an adaptive telescoping mechanism to precisely track and support the user's active leg-lifting movements. When the user attempts to lift their leg, the device automatically adjusts its height to adapt to leg changes, ensuring stable support at every leg-lifting angle. This combination of active force application and automatic tracking not only enhances the targeted nature and effectiveness of the exercise but also promotes the recovery of knee joint stability, flexibility, and muscle strength. Simultaneously, the device provides subtle assistance to help users gradually increase exercise intensity at different rehabilitation stages, accelerating the recovery process and achieving better exercise results. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a side view of the present invention; Figure 2 This is a schematic diagram of the front side of the present invention; Figure 3 This is a cross-sectional schematic diagram of the adaptive expander of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 For the present invention Figure 3 Enlarged view of a portion of point B in the middle; Figure 6 This is a schematic diagram of the present invention; Figure 7 This is a schematic diagram of the initial position of the contact body of the present invention; Figure 8 This is a schematic diagram of one of the working positions of the contact body of the present invention.

[0020] Reference numerals: 1. Knee brace; 10. Bracket body; 11. Strap; 2. Adaptive telescopic device; 20. Piston cylinder; 20. First pressure zone; 201. Second pressure zone; 202. Piston rod; 21. Piston head; 210. Balance channel; 211. Abutment cavity; 212. Elastic column; 213. Second elastic element; 2132. Guide structure; 2133. Cavity; 214. First elastic element; 215. Blind hole; 216. Force measuring rod; 22. Abutment body; 221. Plane; 222. Pipeline; 23. Airbag; 24. Detailed Implementation

[0021] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0022] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] Subsequent embodiments provide a knee joint exercise device and method.

[0024] One possible implementation of a knee joint exercise device is as follows: See Figures 1-8 The knee joint exercise device includes a chair seat with a cushion, a knee brace 1, and an adaptive telescoping device 2. The knee brace 1 is used to stabilize the lower leg and is also fixedly connected to the extended end of the adaptive telescoping device 2. Different extension amounts correspond to different lower leg flexion angles. The extension direction of the adaptive telescoping device 2 is circumferential. During installation, the center point of the adaptive telescoping device 2 should be aligned with the center of the user's knee joint as much as possible, taking into account the user's sitting position on the chair seat. (See reference...) Figure 1 , Figure 1 The knee joint was marked with an X.

[0025] For details, please refer to Figure 3 Adaptive scalar 2 includes: The arc-shaped piston cylinder 20, piston rod 21, and force measuring rod 22 can be a portion of a circle, such as a quarter circle, to ensure smooth sliding, and can be located under the seat. The piston head 210 of the piston rod 21 is slidably connected to the piston cylinder 20, dividing the cavity area of ​​the piston cylinder 20 into a first pressure zone 201 and a second pressure zone 202. The piston head 210 is provided with a balance channel 211 that connects the first pressure zone 201 and the second pressure zone 202. The open / closed state of the balance channel 211 is switched by the position of the force measuring rod 22. When the balance channel 211 is open, the two pressure zones are independent and closed, making it difficult for the piston rod 21 to slide; when the balance channel 211 is open, the two pressure zones are connected, and the piston rod 21 can slide under force.

[0026] The force measuring rod 22 is slidably connected to the piston rod 21 and can slide relative to the piston rod 21. It is located on one side of the tail end of the piston rod 21. After the force measuring rod 22 extends beyond the piston rod 21, it is connected to the knee brace 1 and is located on one side of the piston head 210. It is provided with an abutment body 221. The piston head 210 is provided with an abutment cavity 212 for the abutment body 221 to slide. The sliding range of the force measuring rod 22 in the piston rod 21 is determined by the length of the abutment cavity 212. The abutment cavity 212 is located inside the piston head 210. An elastic column 213 is provided in the cavity wall between the balance channel 211 and the abutment cavity 212. When the abutment body 221 slides in the abutment cavity 212, it can squeeze and change the position of the elastic column 213. The abutment state is changed by the sliding of the force measuring rod 22 relative to the abutment cavity 212. The initial position of the abutment 221 is located at the abutment elastic post 213, at which point the balance channel 211 is disconnected, as... Figure 6 As shown, the piston rod 21 cannot slide at this time, but the force measuring rod 22 can slide inside the piston rod 21. A recovery mechanism is provided between the piston rod 21 and the force measuring rod 22, which automatically returns to the initial position when no external force is applied, that is, the position where it abuts against the elastic column 213 to close the balance channel 211.

[0027] The main working principle of the above embodiments is as follows: Initially, piston rod 21 is located at the innermost end of piston cylinder 20, that is, in a completely extended state. At this time, knee brace 1 is against the chair seat, and piston rod 21 is retracted to its limit. Then, the user sits on the chair seat, fixing their lower legs to knee brace 1. The weight of the lower legs exerts pressure on knee brace 1, acting on force measuring rod 22, pressing... Figure 1 From the shown perspective, the lower leg and knee brace 1 exert clockwise pressure on the force-measuring rod 22, causing the force-measuring rod 22 to slide clockwise relative to the piston rod 21. Simultaneously, a restoring mechanism is provided between the piston rod 21 and the force-measuring rod 22, providing a reaction force that causes the force-measuring rod 22 to slide counterclockwise relative to the piston rod 21. Under the combined action of these two forces, the piston rod 21 will be in equilibrium. At this point, on the piston head 210 side of the piston rod 21, the contact body 221 of the force-measuring rod 22 will be positioned as shown... Figure 6The state shown is such that the elastic column 213 is just abutting against the pressure, the elastic column 213 is inserted into the balance channel 211 and the balance channel 211 is closed, the first pressure zone 201 and the second pressure zone 202 are disconnected, the liquid cannot communicate with each other, and therefore the piston rod 21 cannot slide in the piston cylinder 20. This state is considered the initial state.

[0028] The leg-raising exercise involves the user actively raising their leg. First, the lower leg pulls the knee brace 1 counter-clockwise, causing it to be subjected to force. The knee brace 1 then pulls the force-measuring rod 22 counter-clockwise, breaking the initial force balance achieved by the force-measuring rod 22 due to the weight of the lower leg and the reaction force of the recovery mechanism. At this point, the piston rod 21 cannot move. After the balance is disrupted, the pulling force of the lower leg raising will cause the force-measuring rod 22 to slide counter-clockwise relative to the piston rod 21. Therefore, at the piston head 210 of the piston rod 21... Figure 6 In the initial state shown, the contact body 221 slides to the right and is offset from the position of the elastic column 213. The elastic column 213 pops out, thus connecting the balance channel 211. At this time, the first pressure zone 201 and the second pressure zone 202 are switched to a connected state. If the leg continues to be lifted, the force measuring rod 22 will pull the piston rod 21 to rotate counterclockwise. Inside the piston cylinder 20, the liquid pressure between the first pressure zone 201 and the second pressure zone 202 can be automatically balanced through the balance channel 211.

[0029] During this process, once the user stops lifting their leg (knee joint relaxes and exerts no force), that is, the force measuring rod 22 returns to a state where it is only subjected to gravity. At this time, the pressure exerted by the weight of the lower leg on the force measuring rod 22 and the restoring force generated by the recovery mechanism will cause the force measuring rod 22 to slide clockwise relative to the piston rod 21, that is, return to the state where... Figure 6 In the initial state shown, the balance channel 211 between the first pressure zone 201 and the second pressure zone 202 is closed by the elastic column 213. The first pressure zone 201 and the second pressure zone 202 are two independent cavities, which can limit the sliding of the piston rod 21 in the piston cylinder 20, thereby fixing the current position, that is, fixing the current angle of the knee brace 1, supporting and fixing the lower leg, and allowing the user to rest.

[0030] In the leg-retracting exercise, when the user actively retracts their leg, the calf first compresses the knee brace 1 clockwise, and the knee brace 1 then presses the force measuring rod 22 clockwise, thus breaking the force balance achieved by the force measuring rod 22 due to the weight of the calf and the reaction force of the recovery mechanism. At this time, the piston rod 21 cannot move. After the balance is broken, the pressure of the calf retracting will cause the force measuring rod 22 to slide clockwise relative to the piston rod 21. Therefore, at the piston head 210 of the piston rod 21, Figure 6 In the equilibrium state shown, the contact body 221 slides to the left, becoming as shown. Figure 7In the state shown, the positions of the contact body 221 and the elastic column 213 are misaligned, and the elastic column 213 pops out, thus connecting the balance channel 211. At this time, the first pressure zone 201 and the second pressure zone 202 are switched to a connected state. If the leg is pressed down, the force measuring rod 22 will pull the piston rod 21 to rotate clockwise. Inside the piston cylinder 20, the liquid pressure between the first pressure zone 201 and the second pressure zone 202 can be automatically balanced through the balance channel 211.

[0031] During this process, once the user stops retracting their leg (knee joint relaxes and exerts no force), that is, the force measuring rod 22 returns to a state where it is only subjected to gravity. At this time, the pressure exerted by the weight of the lower leg on the force measuring rod 22 and the restoring force generated by the recovery mechanism will cause the force measuring rod 22 to slide counterclockwise relative to the piston rod 21, that is, return to the state where... Figure 6 In the initial state shown, the balance channel 211 between the first pressure zone 201 and the second pressure zone 202 is closed by the elastic column 213. The first pressure zone 201 and the second pressure zone 202 are two independent cavities, which can limit the sliding of the piston rod 21 in the piston cylinder 20, thereby fixing the current position, that is, fixing the current angle of the knee brace 1.

[0032] From the user's perspective, when simply sitting on the exercise device with the lower leg fixed to the knee brace 1, the device supports the lower leg and keeps it in place without exerting force. When the user attempts to raise their leg, the leg-raising motion pulls the knee brace 1 upwards. Once the force is released, the knee brace 1 remains in place for support. After resting, if the leg is raised again, the knee brace 1 continues to rise, supporting the leg once the force is released. After raising the leg to a larger angle, the leg can also be pulled back in the opposite direction. Simply press the leg down; the leg-pressing motion presses the knee brace 1 downwards, and once the force is released, the knee brace 1 remains in place for support. Users can repeat this extension and contraction exercise, adjusting the intensity according to their own capabilities each time.

[0033] From a fundamental principle perspective, within the piston cylinder 20, when fluid cannot be exchanged between the first pressure zone 201 and the second pressure zone 202, the piston rod 21 cannot slide. This is the initial position, where the abutment body 221 pushes up the elastic column 213 to close the balance channel 211, which is also the equilibrium position between gravity and the reaction force of the recovery mechanism. During exercise, the user's legs provide additional force, disrupting this balance and causing the abutment body 221 to slide and misalign with the elastic column 213, connecting the balance channel 211. Therefore, the piston rod 21 can slide within the piston cylinder 20. Once the external force provided by the legs disappears, the recovery mechanism will cause the abutment body 221 to return to its initial position, pushing up the elastic column 213 to close the balance channel 211, thus keeping the piston rod 21 in its original position.

[0034] This exercise device offers significant benefits, allowing users to actively exert force according to their own ability level, thus ensuring targeted and effective training. Compared to traditional passive leg-raising exercises, this device allows users to better control the intensity and rhythm of their workout, avoiding sports injuries caused by improper external force. When using this device, users can perform leg-raising and leg-pressing movements according to their own physical condition, gradually challenging their limits and thus progressively improving the training effect. Because the device's support and recovery mechanisms automatically respond to the user's movements, users can maintain a stable posture and rest at any time during exercise, thereby improving the quality and safety of the workout.

[0035] In the above embodiment, the recovery mechanism is used to automatically return to the initial position when the leg is not exerting force, that is, the position where the abutment 221 abuts against the elastic column 213, such as... Figure 6 As shown. The recovery principle of the recovery mechanism is elasticity. Specifically, the recovery mechanism is located at one end of the piston tail, combined with... Figure 3 and Figure 5 The piston rod 21 has a recess 214 at its tail end, and a first elastic element 215 is provided in the recess 214. One end of the first elastic element 215 abuts against the bottom of the hole in the recess 214, and the other end abuts against the knee brace 1.

[0036] Initially, when the lower leg is fixed to the knee brace 1, the piston rod 21 cannot move. When the lower leg is not exerting force, the weight of the lower leg and the knee brace 1 will press down on the force measuring rod 22, while the first elastic element 215 will support the force measuring rod 22 and the knee brace 1. By adjusting the elastic properties of the first elastic element 215, a suitable first elastic element 215 can be found. Taking a spring as an example, the elastic modulus of the spring needs to be determined so that under the combined action of gravity and elastic force, when the two are in equilibrium, at the other end of the force measuring rod 22, the force measuring rod 22 and the piston rod 21 are in a state of equilibrium. Figure 6 The equilibrium state shown ensures that the equilibrium channel 211 is closed, thus preventing the piston rod 21 from sliding when the first pressure zone 201 and the second pressure zone 202 are isolated from each other. Therefore, when the user's lower leg is not exerting force, the knee brace 1 provides support, keeping it in place. However, whether the user forcefully lifts or presses their leg, the force-measuring rod 22 and the knee brace 1 immediately respond to this force, thus extending or retracting relative to the piston cylinder 20 accordingly. Once the user stops exerting force, it remains in place.

[0037] For the same user, the weight of the lower leg is stable, and therefore the pressure of the lower leg on the knee brace 1 is also stable. However, when this device is used by different users, in order to maintain the balance between the gravitational pressure of the lower leg and the reaction force of the recovery mechanism, the abutment body 221 pushes up the elastic column 213 to close the balance channel 211. Therefore, the first elastic element 215 needs to be replaced according to the condition of the user's lower leg. Therefore, the connection between the knee brace 1 and the force measuring rod 22 is detachable. After disassembly, the first elastic element 215 with different elastic forces can be replaced between the knee brace 1 and the force measuring rod 22 to accommodate different users.

[0038] This embodiment describes the technical solution for the elastic column 213, which can be referred to. Figure 4 The elastic column 213 includes a column body and a second elastic element 2132. The column body is slidably installed in the abutment hole. The abutment hole passes through the cavity wall between the abutment cavity 212 and the balance channel 211, passes through the balance channel 211, and forms a blind hole 216 on the wall of the balance channel 211. A guide structure 2133 is provided on the side of the column body facing the piston head 210, and the other side abuts against the bottom of the blind hole 216 through the second elastic element 2132.

[0039] The guide structure 2133 ensures that the compressive force of the abutment 221 is converted into a retraction force on the elastic column 213. When the abutment 221 is not in contact with the elastic column 213, the column body of the elastic column 213 will be in an extended state under the action of the second elastic element 2132. At this time, the balance channel 211 is in a connected state, and the liquids in the first pressure zone 201 and the second pressure zone 202 can flow to each other, so the piston rod 21 can slide and extend within the piston cylinder 20.

[0040] When the abutting body 221 abuts against the elastic column 213, the abutting force overcomes the elastic force of the second elastic element 2132, causing the column body of the abutting body 221 to close the balance channel 211. The liquids in the first pressure zone 201 and the second pressure zone 202 cannot flow to each other. Therefore, the piston rod 21 cannot slide and extend within the piston cylinder 20, and can only support the lower leg in place.

[0041] Please see Figure 4 and Figure 5Multiple sets of balance channels 211, elastic columns 213, and abutment holes are arranged along the circumference of the piston rod 21. The abutment body 221 is spherical, thus enabling compression of each set of elastic columns 213 around the circumference. The balance channel 211 connects the first pressure zone 201 and the second pressure zone 202. The piston rod 21 can only slide when connected, because the hydraulic pressure in the first pressure zone 201 and the second pressure zone 202 needs to be balanced. The number of balance channels 211 determines the speed of fluid exchange between the first pressure zone 201 and the second pressure zone 202, and also determines the speed at which the piston rod 21 slides and extends within the piston cylinder 20. When there is only one balance channel 211, the speed of fluid exchange between the first pressure zone 201 and the second pressure zone 202 is slower. From the user's perspective, this manifests as the device being "stiff," meaning that when forcefully lifting or pressing down the lower leg, more force is required, or the sliding speed of the piston rod 21 is slower. If the device as a whole needs to be "softer", more balance channels 211 can be set up. When the piston rod 21 is under pressure and needs to slide, the liquid between the first pressure zone 201 and the second pressure zone 202 can be exchanged quickly, which makes the piston rod 21 lighter and more responsive.

[0042] This embodiment can be referred to. Figure 7 The contact area between the arc-shaped apex of the abutment 221 and the elastic column 213 is a plane 222 or a cylindrical surface. Its advantage is that during the sliding process of the abutment 221, the degree of contact between the plane 222 or cylindrical surface and the elastic column 213 is consistent, thus always sealing the balance channel 211. This results in a wider range of balance positions. When the weight difference of the lower leg is not significant, although there may be a deviation between its force balance point and that of the recovery mechanism, as long as it does not exceed the range of the plane 222 or cylindrical surface, the device will remain in a balanced state and can provide support for the lower leg without the need to replace the spring.

[0043] In the above embodiments, the contact area between the arcuate apex of the abutment body and the elastic column is designed as a plane or cylinder, significantly expanding the range of the balance position. This design ensures that even if the force balance point deviates slightly when the weight or force difference of the lower leg is small, as long as the deviation causes the abutment body 221 to slide and the elastic column 213 does not exceed the range of the plane or cylinder, the device can still maintain a balanced state and provide support. Therefore, this structure not only improves the stability and adaptability of the device, but also effectively prevents the loss of balance due to slight force exerted by the leg, continuously providing stable support for the lower leg and enhancing the comfort and reliability of use.

[0044] Please refer to this embodiment. Figure 2 The seat is a wheelchair, and the adaptive telescoping device 2 is located under the seat cushion. The piston rod 21 and force measuring rod 22 of the adaptive telescoping device 2 face forward of the wheelchair. When not exercising, this device can also be used as a regular wheelchair.

[0045] Please refer to this embodiment. Figure 8 The knee brace 1 includes a frame body 10 and straps 11. The frame body 10 is arc-shaped, with the inner side supporting the calf and the outer side connected to the force measuring rod 22 of the adaptive telescopic device 2. The straps 11 are located on the opposite side of the arc of the frame body 10 and are used to fix the calf to the frame body 10.

[0046] Please refer to this embodiment. Figure 3 Each of the first pressure zone 201 and the second pressure zone 202 is provided with a pipe 23, and the end of the pipe 23 is connected to an airbag 24. The airbag 24 is located in the area on the seat where the user can hold it. When the user squeezes the airbag 24, fluid can be pumped into the corresponding pressure zone.

[0047] Its beneficial effects are as follows: When the user's calf is not exerting force, the piston rod 21 is in a balanced position, the balance channel 211 is disconnected, and the first pressure zone 201 and the second pressure zone 202 are independent, preventing the force measuring rod 22 from sliding relative to the piston rod 21. Alternatively, a hole can be provided through the piston rod 21 and the force measuring rod 22, and a pin can be inserted to lock their relative sliding, thus achieving a passive exercise method. At this time, the user squeezes the airbag 24, creating a pressure difference between the first pressure zone 201 and the second pressure zone 202, which allows the piston rod 21 to slide, thereby pushing the calf to contract and expand, thus passively moving the knee joint and achieving a coordinated hand-foot exercise effect. This method can be used in situations where the user's knee joint is completely unable to exert force in the early stages. As the knee joint recovers, an active force exertion mode can be used later.

[0048] This embodiment provides a knee joint exercise method, using the knee joint exercise device described above, including the following steps: In the initial step, the abutment body 221 presses against the elastic column 213, and the elastic column 213 closes the balance channel 211. At this time, the device only supports the legs, allowing the lower legs to maintain their original angle and position. The leg-raising exercise involves the user actively raising their leg to break the balance between their own weight and the recovery mechanism. The leg raise causes the knee brace 1 to move, and the force measuring rod 22 is pulled up by the knee brace 1 and slides relative to the piston rod 21. The abutment 221 of the force measuring rod 22 is misaligned with the elastic column 213, and the elastic column 213 pops out, connecting the balance channel 211. When the leg is raised again, the force measuring rod 22 pulls the piston rod 21 to slide along the piston cylinder 20 during the process of raising the leg and pulling the force measuring rod 22. When the leg-raising exercise stops, the knee joint and lower leg no longer exert force, the force measuring rod 22 loses tension, and under the weight of the lower leg and the action of the recovery mechanism, the force measuring rod 22 returns to the initial position, the abutment body 221 presses against the elastic column 213 to close the balance channel 211, and the piston rod 21 remains in the original position. The leg-pulling exercise involves the user actively pulling their leg in, disrupting the balance between their own weight and the recovery mechanism. This leg-pulling causes the knee brace 1 to move, pressing the force-measuring rod 22 down relative to the piston rod 21. The abutment 221 of the force-measuring rod 22 misaligns with the elastic column 213, causing the elastic column 213 to pop out and opening the balance channel 211. As the leg continues to press down, the force-measuring rod 22 pushes the piston rod 21 along the piston cylinder 20. Once the leg-pulling exercise stops, the knee joint and lower leg no longer exert force. Under the weight of the lower leg and the recovery mechanism, the force-measuring rod 22 returns to its initial position, the abutment 221 presses against the elastic column 213, closing the balance channel 211, and the piston rod 21 remains in its original position.

[0049] The above-mentioned knee joint exercise method, combined with a specialized device, integrates active training with automatic support. Through the reciprocating movements of raising and lowering the leg, users can flexibly adjust the exercise intensity according to their own strength, enhancing both the stability and flexibility of the knee joint while also strengthening leg muscles. The device's adaptive balance mechanism ensures smooth transitions between movements, effectively preventing sports injuries. Furthermore, this method encourages users to actively exert force, gradually challenging their personal limits. Compared to passive training, it better stimulates potential, accelerates the recovery process, and improves overall exercise effectiveness.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A knee joint exercising device comprising a chair seat body on which a seat cushion is provided, characterized by, It also comprises a knee pad frame (1) for fixing the lower leg and an adaptive telescopic device (2), the knee pad frame (1) is fixedly connected to the extension end of the adaptive telescopic device (2), and different telescopic amounts correspond to different lower leg bending angles. The adaptive telescopic device (2) comprises an arc-shaped piston cylinder (20), a piston rod (21) and a force bar (22). A piston head (210) of the piston rod (21) is slidingly connected in the piston cylinder (20), thereby dividing the cavity region of the piston cylinder (20) into a first pressure area (201) and a second pressure area (202), a balance channel (211) capable of communicating the first pressure area (201) and the second pressure area (202) is arranged on the piston head (210), and the on-off state of the balance channel (211) is switched by the position of the force bar (22). The force bar (22) is slidingly connected in the piston rod (21), is connected to the knee pad frame (1) on the tail end side of the piston rod (21), is arranged on the side of the piston head (210), and is provided with an abutting body (221), and the piston head (210) is provided with an abutting cavity (212) for sliding of the abutting body (221). An elastic column (213) is arranged through the cavity wall between the balance channel (211) and the abutting cavity (212), and the abutting body (221) can extrude and change the position of the elastic column (213) when sliding in the abutting cavity (212). The initial position of the abutting body (221) is located at the position abutting against the elastic column (213), at this time, the balance channel (211) is disconnected, and a restoring mechanism is arranged between the piston rod (21) and the force bar (22), and the initial position is automatically restored under no external force.

2. The knee joint exercise device according to claim 1, characterized in that: The restoring mechanism is located at the tail end of the piston, the tail end of the piston rod (21) is provided with a concave cavity (214), a first elastic member (215) is arranged in the concave cavity (214), one end of the first elastic member (215) abuts against the hole bottom of the concave cavity (214), and the other end abuts against the knee pad frame (1).

3. The knee joint exercise device according to claim 2, characterized in that: The knee pad frame (1) and the force bar (22) are connected in a detachable manner, and after being detached, the knee pad frame (1) and the force bar (22) can replace the first elastic member (215) with different elastic forces.

4. The knee joint exercise device according to claim 1, characterized in that: The elastic column (213) comprises a column body and a second elastic member (2132), the column body is slidingly installed in an abutting hole, the abutting hole penetrates through the cavity wall between the abutting cavity (212) and the balance passage (211), then penetrates through the balance passage (211) and forms a blind hole (216) on the wall surface of the balance passage (211), the column body is provided with a guide structure (2133) on the side facing the piston head (210), and the other side is abutted against the bottom of the blind hole (216) through the second elastic member (2132).

5. A knee joint exercise device as claimed in claim 4, wherein: The balance passage (211), elastic column (213) and abutting hole are provided with multiple groups along the circumference of the piston rod (21), and the abutting body (221) is spherical.

6. A knee joint exercise device as claimed in claim 5, wherein: The contact area between the arc top of the side of the abutting body (221) and the elastic column (213) is a plane (222) or a cylindrical surface.

7. A knee joint exercise device as claimed in claim 1, wherein: The chair seat body is a wheelchair, the self-adapting telescopic device (2) is located on the lower side of the cushion, and the piston rod (21) and the force bar (22) of the self-adapting telescopic device (2) face the front of the wheelchair.

8. A knee joint exercise device as claimed in claim 1, wherein: The knee guard frame (1) comprises a frame body (10) and a binding belt (11), the frame body (10) is arc-shaped, supports the calf on the inner side and is connected with the force bar (22) of the self-adapting telescopic device (2) on the outer side; The binding belt (11) is arranged on the opposite side of the arc-shaped frame body (10) and is used for fixing the calf and the frame body (10).

9. A knee joint exercise device as claimed in claim 1, wherein: The first pressure area (201) and the second pressure area (202) are each provided with a pipeline (23), and the pipeline (23) is respectively connected with an air bag (24) at the end.

10. A method of knee exercise, characterized by, The knee joint exercise device comprises the following steps: In the initial step, the abutting body (221) abuts against the elastic column (213), and the elastic column (213) closes the balance passage (211); In the leg lifting exercise step, the force bar (22) is pulled up by the knee guard frame (1) to slide relative to the piston rod (21), the abutting body (221) of the force bar (22) is dislocated from the elastic column (213), the elastic column (213) is popped out, the balance passage (211) is communicated, and the force bar (22) pulls the piston rod (21) to slide along the piston cylinder (20); In the stop leg lifting exercise step, the force bar (22) loses the pulling force and returns to the initial position, the abutting body (221) abuts against the elastic column (213) to close the balance passage (211), and the piston rod (21) remains in the original position.

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