Self-adaptive load-bearing damping brace for osteoarthritis

Abstract

The osteoarthritis self-adaptive load-bearing damping brace comprises a hook-and-loop fastener, a clamping and fixing unit capable of reducing the bending pressure of a knee joint is arranged on the back face of the hook-and-loop fastener, and a movable supporting unit for tightly attaching and protecting the knee joint is arranged on the side face of the clamping and fixing unit. The clamping and fixing unit comprises a movable middle shaft which is arranged on the side face of the hook-and-loop fastener and used for fixing different leg types; the two shells are placed at the bottoms of the thighs and the tops of the shanks of a user respectively, it is ensured that the two shells can be driven to be folded in the direction of the inclined supporting blocks when the legs are bent, at the moment, movable middle shafts are installed on the side faces of the shells, and it is ensured that push plates are tightly attached to the thigh peak of a patient; the binding band is installed in the side face of the shell, the movable middle shaft is bound to the legs of a user through cooperation of the binding band, the fixing buckle and the hook-and-loop fastener, at the moment, the movable clamping plate tightly wraps the legs of the user under the thrust of the movable middle shaft and the guide of the inclined face of the base plate, and the stability of the device in daily movement is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of cushioning and shock-absorbing protective gear technology, specifically to an adaptive weight-bearing shock-absorbing brace for osteoarthritis. Background Technology

[0002] Osteoarthritis is a chronic degenerative joint disease characterized by degenerative damage to articular cartilage, accompanied by periarticular bone hyperplasia, synovitis, and thickening of the joint capsule. It is not simply joint aging, but rather a series of chain reactions leading to joint structural damage caused by cartilage wear. It can occur in weight-bearing joints (such as the knee, hip, and spine) and non-weight-bearing joints (such as finger joints), with knee osteoarthritis being the most common, especially prevalent in middle-aged and elderly individuals, obese individuals, those who engage in long-term heavy-duty labor, or those with joint injuries. Osteoarthritis is essentially a condition caused by wear and tear of articular cartilage and compensatory lesions of surrounding structures. The patient's joints have lost their normal self-buffering and protective capabilities. To prevent daily activities from further aggravating this condition, shock-absorbing braces are usually used to achieve comprehensive mechanical intervention for joint shock absorption, support, stability, and protection. This can be referenced in the relevant patent CN116269983A. Essentially, the brace uses a connecting mechanism in conjunction with a locking mechanism to adapt and fix the brace length to provide basic support. At the same time, the joint protection mechanism uses an inflatable airbag to push a sponge pad to fit the joint and form a pneumatic fixation support. The support mechanism uses adjustable straps and screw locking structures to fix the thigh and lower leg and adjust their position. The multi-structure synergy achieves knee joint decompression and load reduction, as well as meniscus protection.

[0003] Let's explain from the perspective of knee joint movement: As the main weight-bearing joint in the human body, the core movement of the knee joint is flexion and extension, accompanied by slight inversion, valgus, and rotation. The load-bearing pressure on the joint varies significantly at different flexion and extension angles. Existing devices for knee joint protection usually use flexible materials to provide support or fix the knee with hinged knee braces, allowing for a certain degree of movement. While these methods can alleviate knee joint pressure to some extent, they cannot effectively buffer the high-intensity load generated by various factors during flexion and extension movements. Therefore, it is necessary to adopt a support structure with dynamically adjustable damping according to the flexion and extension angle to reduce the burden on the joint during dynamic movements. To this end, we offer the Osteoarthritis Adaptive Weight-Bearing Shock-Damping Brace to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an adaptive load-bearing shock-absorbing brace for osteoarthritis, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An adaptive weight-bearing shock-absorbing brace for osteoarthritis includes Velcro, the back of which is provided with a clamping and fixing unit that can reduce the bending pressure of the knee joint, and the side of which is provided with a movable support unit that fits tightly to protect the knee joint. The clamping and fixing unit includes a movable shaft disposed on the side of the Velcro for fixing different leg types, a housing disposed on the side of the movable shaft for fixing, and an inclined support block fixedly connected to the back of the housing for supporting. The movable support unit includes a connecting rod fixedly connected to the side of the outer shell for connecting purposes, and a movable base disposed on the side of the connecting rod for supporting the movement of the knee.

[0006] A further improvement of the technical solution of the present invention is that: the number of the outer shells is two and they are oriented opposite each other; a plurality of elastic support blocks are fixedly connected inside the outer shells; and a pad is fixedly connected to the side of the elastic support blocks.

[0007] A further improvement of the technical solution of the present invention is that: a rotating shaft is fixedly connected to the side of the outer shell, a limiting block is fixedly connected to the side of the rotating shaft, and there are two rotating shafts, with the other rotating shaft fixedly connected to the other end of the side of the outer shell.

[0008] A further improvement of the technical solution of the present invention is that: a push plate is fixedly connected to the side of the movable shaft, and a movable clamping plate is movably connected to the side of the push plate, and the number of the movable clamping plates is two and they are oriented opposite to each other.

[0009] A further improvement of the technical solution of the present invention is that: a strap is fixedly connected to the other side of the movable shaft, a fixing buckle is fixedly connected to the side of the strap, the fixing buckle is movably connected to the inside of the side of the outer shell, one end of the Velcro is fixedly connected to the side of the strap, and the fixing buckle is movably connected to the outer surface of the Velcro.

[0010] A further improvement of the technical solution of the present invention is that: a support arm is movably connected to the back of the inclined support block, a hydraulic rod is movably connected inside the support arm, one end of the hydraulic rod is movably connected inside the movable shaft, an adjusting nut is threadedly connected to the outer surface of the hydraulic rod, and a spring is movably connected to one end of the outer surface of the hydraulic rod.

[0011] A further improvement of the technical solution of the present invention is that: the connecting rod is movably connected to the outer surface of the rotating shaft, the limiting block is movably connected to the side of the connecting rod, and a fixing rod is fixedly connected to the side of the connecting rod.

[0012] A further improvement of the technical solution of the present invention is that: a slide rail is fixedly connected to the side of the fixed rod, and a slide rod is fixedly connected to the side of the movable base, and the slide rod is slidably connected inside the slide rail.

[0013] A further improvement of the technical solution of the present invention is that: a limit buckle is rotatably connected to one end of the outer surface of the slide rod, and a spring rod is movably connected to the side of the limit buckle, and the spring rod is movably connected to the side of the connecting rod.

[0014] A further improvement of the technical solution of the present invention is that: a spring push rod is fixedly connected to the back of the movable base, a fixed seat is fixedly connected to the output end of the spring push rod, a limit rod is fixedly connected to the back of the fixed seat, the limit rod is slidably connected inside the movable base, and a knee guard is movably connected to the side of the fixed seat.

[0015] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention provides an adaptive weight-bearing shock-absorbing brace for osteoarthritis. By placing two shells on the bottom of the user's thigh and the top of the calf respectively, it is ensured that when the leg is bent, the two shells can be folded towards the inclined support block. At this time, a movable shaft is installed on the side of the shell to ensure that the push plate is close to the top of the patient's leg bone. The strap is installed inside the side of the shell. Through the cooperation of the strap, the fixing buckle and the Velcro, the movable shaft is bound to the user's leg. At this time, the movable splint tightly wraps the user's leg under the thrust of the movable shaft and the guidance of the inclined surface of the pad, ensuring the stability of the device during daily activities. The spring force can be adjusted by turning the adjusting nut according to the user's actual needs. When the user walks or squats and stands up, the bending of the thigh and calf will cause the two outer shells to rotate along the pivot, which in turn will drive the two sets of components based on the support arm to move. 2. This invention provides an adaptive weight-bearing shock-absorbing brace for osteoarthritis. The support arm tilts at different angles depending on the user's leg bending angle. The internal linkage drives the hydraulic rod to move. As the stroke of the hydraulic rod is changed and subjected to compressive force, the internal hydraulic system contracts in conjunction with the spring, reducing the pressure on the user's knee joint and assisting the leg to quickly return from a folded state to an upright state, further reducing the burden on the user's leg muscles.

[0016] 3. This invention provides an adaptive weight-bearing shock-absorbing brace for osteoarthritis. During installation, the knee brace fits snugly against the user's knee and is secured by the force of a spring push rod. During daily activities, the knee brace swings slightly to the side of the fixed base, providing stable support for the knee joint and reducing the pressure on the knee caused by the user's weight and other factors when bending the leg. When the user's leg bends too far, exceeding the range of motion of the knee brace, the knee brace will push the spring push rod back to the appropriate position. As the patient moves further, it will cause the slide rod to slide inside the rail to ensure that the knee brace provides sufficient support for the user's knee joint. At the same time, the spring pull rod will be stretched as the slide rod moves. When the user needs to stand up from a squatting position, the spring pull rod will rebound and cause the slide rod to quickly return to the center, ensuring that the device can always provide support. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the clamping and fixing unit of the present invention; Figure 3 This is a schematic diagram of the component structure of the clamping and fixing unit of the present invention; Figure 4 This is another structural schematic diagram of the clamping and fixing unit of the present invention; Figure 5 This is a schematic diagram of the structure of the movable support unit of the present invention; Figure 6 This is a schematic diagram of the component structure of the movable support unit of the present invention; Figure 7 This is a schematic diagram of the component structure of the active support unit of the present invention.

[0018] In the diagram: 1. Velcro; 2. Clamping and fixing unit; 21. Outer shell; 22. Inclined support block; 23. Central pivot; 24. Elastic support block; 25. Pad; 26. Rotating shaft; 27. Limiting block; 28. Movable clamping plate; 29. ​​Push plate; 210. Fixing buckle; 211. Strap; 212. Support arm; 213. Hydraulic rod; 214. Adjusting nut; 215. Spring; 3. Movable support unit; 31. Connecting rod; 32. Movable base; 33. Fixing rod; 34. Slide rail; 35. Limiting buckle; 36. Spring pull rod; 37. Slide rod; 38. Spring push rod; 39. Limiting rod; 310. Fixing seat; 311. Knee guard. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments: Example 1: As Figure 1-7As shown, the present invention provides an adaptive weight-bearing shock-absorbing brace for osteoarthritis, including a Velcro 1. The back of the Velcro 1 is provided with a clamping and fixing unit 2 that can reduce the bending pressure of the knee joint. The side of the clamping and fixing unit 2 is provided with a movable support unit 3 that fits tightly to protect the knee joint. The clamping and fixing unit 2 includes a movable shaft 23 provided on the side of the Velcro 1 for fixing different leg types, a shell 21 provided on the side of the movable shaft 23 for fixing, and an inclined support block 22 fixedly connected to the back of the shell 21 for supporting. Two outer shells 21 are arranged opposite each other and connected together by a connecting rod 31. One side of the top surface of the outer shell 21 is provided with an arc-shaped notch for assisting the folding of the two outer shells 21. The pad 25 has a certain support and is fixed to the side of the outer shell 21. The elastic support block 24 can bend back when the pad 25 is subjected to pressure. The pivot 26 serves as the connection base point to the connecting rod 31 and is also the rotation axis of the outer shell 21. The limiting block 27 will be tightly attached to the side of the connecting rod 31 to play a limiting role. There are two outer shells 21 facing each other. Multiple elastic support blocks 24 are fixedly connected inside the outer shell 21. A pad 25 is fixedly connected to the side of the elastic support block 24. A rotating shaft 26 is fixedly connected to the side of the outer shell 21. A limit block 27 is fixedly connected to the side of the rotating shaft 26. There are two rotating shafts 26. Another rotating shaft 26 is fixedly connected to the other end of the side of the outer shell 21. The movable clamp 28 is connected to the movable clamp 28 by a hinge. The two movable clamps 28 are fixed on the left and right sides of the movable shaft 23 respectively. The push plate 29 is provided with flexible material. The strap 211 is fixed to the back of the movable shaft 23. The outer shell 21 has three through holes on its side. One end of the strap 211 is movably connected to the inside of the through hole on the side of the outer shell 21. One end of the Velcro 1 is fixed to the side of the strap 211, and the other end moves inside the fixing buckle 210 and is folded along the fixing buckle 210 as the axis. A push plate 29 is fixedly connected to the side of the movable shaft 23. A movable clamping plate 28 is movably connected to the side of the push plate 29. There are two movable clamping plates 28, which are oriented opposite to each other. A strap 211 is fixedly connected to the other side of the movable shaft 23. A fixing buckle 210 is fixedly connected to the side of the strap 211. The fixing buckle 210 is movably connected to the inside of the side of the outer shell 21. One end of the Velcro 1 is fixedly connected to the side of the strap 211. The fixing buckle 210 is movably connected to the outer surface of the Velcro 1.

[0020] In this embodiment, by placing the two outer shells 21 at the bottom of the user's thigh and the top of the calf respectively, it is ensured that when the leg is bent, the two outer shells 21 can be folded towards the inclined support block 22. At this time, the movable shaft 23 is installed on the side of the outer shell 21, ensuring that the push plate 29 is close to the top of the patient's leg bone, and the strap 211 is installed inside the side of the outer shell 21. Through the cooperation of the strap 211, the fixing buckle 210 and the Velcro 1, the movable shaft 23 is bound to the user's leg. At this time, the movable splint 28 tightly wraps the user's leg under the pushing force of the movable shaft 23 and the guidance of the inclined surface of the pad 25, ensuring the stability of the device during daily activities.

[0021] The adjusting nut 214 can be rotated according to the user's actual needs to adjust the elasticity of the spring 215. When the user walks or squats and stands up, the bending of the thigh and calf will cause the two outer shells 21 to rotate along the pivot 26, thereby driving the two sets of components based on the support arm 212 to move.

[0022] Example 2: As Figure 1-7 As shown, based on Embodiment 1, the present invention provides a technical solution: preferably, a support arm 212 is movably connected to the back of the inclined support block 22, a hydraulic rod 213 is movably connected inside the support arm 212, one end of the hydraulic rod 213 is movably connected inside the movable shaft 23, an adjusting nut 214 is threadedly connected to the outer surface of the hydraulic rod 213, and a spring 215 is movably connected to one end of the outer surface of the hydraulic rod 213. 213 are connected in pairs by a connecting rod. One end of 213 is rotatably connected to the outer surface of the connecting rod of 213, and the other end of 213 is rotatably connected to the groove provided inside 22. The two groups of 213 are movably connected together in opposite directions, forming an assembly with two 214. The number of assemblies is two, and the two assemblies are of different sizes.

[0023] In this embodiment, the support arm 212 tilts at different angles depending on the user's leg bending angle. The internal linkage drives the hydraulic rod 213 to move. As the stroke of the hydraulic rod 213 is changed and subjected to compressive force, its internal hydraulic system contracts in conjunction with the spring 215, reducing the pressure on the user's knee joint and assisting the leg to quickly return from a folded state to an upright state, further reducing the burden on the user's leg muscles.

[0024] Example 3: As Figure 1-7As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the movable support unit 3 includes a connecting rod 31 fixedly connected to the side of the outer shell 21 for connecting purposes, and a movable base 32 disposed on the side of the connecting rod 31 for supporting the movement of the knee. The connecting rod 31 is movably connected to the outer surface of the rotating shaft 26, and the limiting block 27 is movably connected to the side of the connecting rod 31. A fixed rod 33 is fixedly connected to the side of the connecting rod 31, and a slide rail 34 is fixedly connected to the side of the fixed rod 33. A sliding rod 37 is fixedly connected to the side of the movable base 32, and the sliding rod 37 is slidably connected inside the slide rail 34. The side of the connecting rod 31 is provided with two connecting holes and connected to the rotating shaft 26. The limiting block 27 will be tightly attached to the side of the connecting rod 31 to prevent the connecting rod 31 from folding in the opposite direction. The slide rod 37 will slide inside the slide rail 34. One end of the outer surface of the slide rod 37 is rotatably connected to a limit buckle 35. A spring pull rod 36 is movably connected to the side of the limit buckle 35. The spring pull rod 36 is movably connected to the side of the connecting rod 31. A spring push rod 38 is fixedly connected to the back of the movable base 32. A fixed seat 310 is fixedly connected to the output end of the spring push rod 38. A limit rod 39 is fixedly connected to the back of the fixed seat 310. The limit rod 39 is slidably connected to the inside of the movable base 32. A knee guard plate 311 is movably connected to the side of the fixed seat 310. The knee pad 311 can slide inside the side of the fixed base 310 and the side is provided with a soft pad. The output end of the spring push rod 38 is located on the other side of the movable base 32 and is connected to the fixed base 310. The two limit rods 39 are connected together by the fixed plate and slide on the outer surface of the spring push rod 38.

[0025] In this embodiment, when the device is installed, the knee pad 311 will fit tightly against the user's knee, and the spring push rod 38 will push it to ensure a tight fit. During the user's daily activities, the knee pad 311 will swing slightly on the side of the fixed seat 310 to provide stable support for the knee joint and reduce the pressure on the knee caused by the user's weight and other factors when the leg is bent. When the user's leg bends too far, exceeding the range of motion of the knee brace 311, the knee brace 311 will push the spring push rod 38 back to the appropriate position. As the patient moves further, the slide rod 37 will slide inside the slide rail 34 to ensure that the knee brace 311 provides sufficient support for the user's knee joint. At the same time, the spring pull rod 36 will be stretched with the movement of the slide rod 37. When the user needs to stand up from a squatting position, the spring pull rod 36 will rebound and drive the slide rod 37 to quickly return to the center, ensuring that the device can always provide support.

[0026] The working principle of this adaptive load-bearing shock-absorbing brace for osteoarthritis will be explained in detail below.

[0027] like Figure 1-7 As shown, by placing the two outer shells 21 on the bottom of the user's thigh and the top of the calf respectively, it is ensured that when the leg is bent, the two outer shells 21 can be folded towards the inclined support block 22. At this time, the movable shaft 23 is installed on the side of the outer shell 21, ensuring that the push plate 29 is close to the top of the patient's leg bone, and the strap 211 is installed inside the side of the outer shell 21. Through the cooperation of the strap 211, the fixing buckle 210 and the Velcro 1, the movable shaft 23 is bound to the user's leg. At this time, the movable splint 28 tightly wraps the user's leg under the push of the movable shaft 23 and the guide of the inclined surface of the pad 25, ensuring the stability of the device during daily activities. When the device is installed, the knee guard 311 will be close to the user's knee, and the spring push rod 38 will ensure that it fits tightly. According to the user's actual needs, turn the adjusting nut 214 to adjust the elastic force of the spring 215. When the user walks or squats and stands up, the bending of the thigh and calf will drive the two outer shells 21 to rotate along the pivot 26, thereby driving the two sets of components based on the support arm 212 to move. The support arm 212 tilts at different angles depending on the user's leg bending angle. Through its internal linkage, it drives the hydraulic rod 213 to move. As the stroke of the hydraulic rod 213 is changed and subjected to compressive force, its internal hydraulic system will contract in conjunction with the spring 215, reducing the pressure on the user's knee joint and assisting the leg to quickly return from the folded state to the upright state, further reducing the burden on the user's leg muscles. During daily activities, the knee pad 311 will swing slightly to the side of the mounting base 310 to provide stable support for the knee joint and reduce the pressure on the knee caused by the user's weight and other factors when the leg is bent. When the user's leg bends too far, exceeding the range of motion of the knee brace 311, the knee brace 311 will push the spring push rod 38 back to the appropriate position. As the patient moves further, the slide rod 37 will slide inside the slide rail 34 to ensure that the knee brace 311 provides sufficient support for the user's knee joint. At the same time, the spring pull rod 36 will be stretched with the movement of the slide rod 37. When the user needs to stand up from a squatting position, the spring pull rod 36 will rebound and drive the slide rod 37 to quickly return to the center, ensuring that the device can always provide support. In summary, the clamping and fixing unit 2 described in this paper can clamp the user's thigh and calf, and limit the joint through the movable support unit 3. When the user walks daily, the clamping and fixing unit 2 can be folded through the movable support unit 3, and the internal hydraulic rod 213 and spring 215 provide adjustable support to reduce the weight-bearing burden on the user's knee joint. At the same time, the movable support unit 3 can provide support to the knee joint with the user's daily activities, reducing the burden on the knee. With the user's movement, the movable support unit 3 adjusts its position to always provide support to the knee at a suitable angle. Under the combined action of the clamping and fixing unit 2 and the movable support unit 3, from the perspective of reducing the pressure on the patient's knee joint and providing support, it provides the patient with sufficient shock absorption and cushioning effect.

[0028] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An adaptive weight-bearing shock-absorbing brace for osteoarthritis, including Velcro (1), characterized in that... The back of the Velcro (1) is provided with a clamping and fixing unit (2) that can reduce the bending pressure of the knee joint, and the side of the clamping and fixing unit (2) is provided with a movable support unit (3) that provides close fit and protection for the knee joint. The clamping and fixing unit (2) includes a movable shaft (23) disposed on the side of the Velcro (1) for fixing different leg types, a housing (21) disposed on the side of the movable shaft (23) for fixing, and an inclined support block (22) fixedly connected to the back of the housing (21) for supporting. The movable support unit (3) includes a connecting rod (31) fixedly connected to the side of the outer shell (21) for connecting purposes, and a movable base (32) provided on the side of the connecting rod (31) for supporting the movement of the knee.

2. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 1, characterized in that: There are two outer shells (21) facing each other. Multiple elastic support blocks (24) are fixedly connected inside the outer shells (21), and pads (25) are fixedly connected to the sides of the elastic support blocks (24).

3. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 2, characterized in that: A rotating shaft (26) is fixedly connected to the side of the outer shell (21), and a limiting block (27) is fixedly connected to the side of the rotating shaft (26). There are two rotating shafts (26), and the other rotating shaft (26) is fixedly connected to the other end of the side of the outer shell (21).

4. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 3, characterized in that: A push plate (29) is fixedly connected to the side of the movable shaft (23), and a movable clamping plate (28) is movably connected to the side of the push plate (29). There are two movable clamping plates (28) and they are oriented opposite to each other.

5. The adaptive weight-bearing shock-absorbing brace for osteoarthritis according to claim 4, characterized in that: A strap (211) is fixedly connected to the other side of the active shaft (23). A buckle (210) is fixedly connected to the side of the strap (211). The buckle (210) is movably connected to the inside of the side of the outer shell (21). One end of the Velcro (1) is fixedly connected to the side of the strap (211). The buckle (210) is movably connected to the outer surface of the Velcro (1).

6. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 5, characterized in that: The back of the inclined support block (22) is movably connected to a support arm (212), and the inside of the support arm (212) is movably connected to a hydraulic rod (213). One end of the hydraulic rod (213) is movably connected to the inside of the movable shaft (23). The outer surface of the hydraulic rod (213) is threaded with an adjusting nut (214), and one end of the outer surface of the hydraulic rod (213) is movably connected to a spring (215).

7. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 6, characterized in that: The connecting rod (31) is movably connected to the outer surface of the rotating shaft (26), the limiting block (27) is movably connected to the side of the connecting rod (31), and a fixing rod (33) is fixedly connected to the side of the connecting rod (31).

8. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 7, characterized in that: The fixed rod (33) is fixedly connected to the side of the slide rail (34), and the movable base (32) is fixedly connected to the side of the slide rod (37), which is slidably connected inside the slide rail (34).

9. The adaptive load-bearing shock-absorbing brace for osteoarthritis according to claim 8, characterized in that: One end of the outer surface of the slide rod (37) is rotatably connected to a limit buckle (35), and a spring pull rod (36) is movably connected to the side of the limit buckle (35), which is movably connected to the side of the connecting rod (31).

10. The osteoarthritis adaptive load-bearing shock-absorbing brace according to claim 9, characterized in that: A spring push rod (38) is fixedly connected to the back of the movable base (32), and a fixed seat (310) is fixedly connected to the output end of the spring push rod (38). A limit rod (39) is fixedly connected to the back of the fixed seat (310), and the limit rod (39) is slidably connected inside the movable base (32). A knee guard (311) is movably connected to the side of the fixed seat (310).

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