A lower limb joint training device for rehabilitation

Abstract

This application relates to the field of medical device technology and discloses a lower limb joint training device for rehabilitation, comprising: a thigh support, the thigh support including two first limiting plates, with a support plate fixed between the two first limiting plates; a calf support, the calf support including two second limiting plates, with a fixing box fixed between the two second limiting plates, and the two second limiting plates being rotatably connected to the two first limiting plates via a rotating shaft; and a pedal located on one side below the calf support, the top of the pedal being fitted with a strap for binding the patient's foot, and the pedal being connected to the fixing box via a lifting mechanism. A connecting column can move along a lower cylindrical groove and an upper cylindrical groove. With the action of a first spring and a fixing ring, when the patient exerts downward force on the pedal, the first spring tends to return to its original position, thereby providing a feedback force to the patient's foot and leg, so as to achieve the effect of exercising the patient's leg.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically a lower limb joint training device for rehabilitation. Background Technology

[0002] Medical devices refer to instruments, equipment, appliances, in vitro diagnostic reagents and calibrators, materials and other similar or related items that are used directly or indirectly on the human body. Medical devices include medical equipment and medical consumables. Their efficacy is mainly obtained through physical means, not through pharmacological, immunological or metabolic means, or although these means are involved, they only play an auxiliary role.

[0003] In the field of orthopedics, some patients may suffer injuries to their lower limb joints due to accidents, and in severe cases, fractures may occur. After receiving treatment, they will gradually recover over time. During the recovery process, appropriate medical devices are needed to assist in the exercise.

[0004] However, existing devices still have related technical problems when assisting patients with lower limb joint rehabilitation exercises:

[0005] 1. It is difficult to exercise the patient's ankle joints;

[0006] Second, during the recovery process, when patients rotate their lower limb joints inward or outward, they have difficulty receiving a reverse feedback force, thus failing to effectively exercise the inner or outer side of the lower limb joints. Furthermore, during the rotation process, it is difficult to control the magnitude of the feedback force.

[0007] Third, while patients are exercising their lower limb joints, the device cannot massage their legs, thus failing to accelerate blood flow in the legs and affecting the recovery effect. Summary of the Invention

[0008] Technical problems to be solved:

[0009] To address the shortcomings of existing technologies, this invention provides a lower limb joint training device for rehabilitation, which solves the problems mentioned in the background art.

[0010] Technical solution:

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A rehabilitation lower limb joint training device, comprising:

[0013] A thigh support, the thigh support including two first limiting plates, and a support plate fixed between the two first limiting plates;

[0014] The lower leg support includes two second limiting plates, a fixing box is fixed between the two second limiting plates, and the two second limiting plates are respectively rotatably connected to the two first limiting plates through a rotating shaft.

[0015] The pedal is located on one side below the lower leg support, and the top of the pedal is equipped with straps for binding the patient's foot. The pedal is connected to the fixing box via a lifting mechanism.

[0016] A connecting plate is located between the thigh support and the calf support. One end of the connecting plate is rotatably connected to the fixing box via a rotating shaft, and the other end of the connecting plate is connected to the first limiting plate via a reset mechanism.

[0017] In one possible implementation, the lifting mechanism includes a lower cylindrical groove and an upper cylindrical groove, both of which are formed inside the fixed box. The upper cylindrical groove is located at the top of the lower cylindrical groove, and a connecting column is provided between the lower cylindrical groove and the upper cylindrical groove. The lower end of the connecting column extends to the bottom of the fixed box.

[0018] The connecting column and the pedal are rotatably connected by a rotating shaft. A fixing ring is fixed inside the upper cylindrical groove on the outside of the connecting column. The diameter of the lower cylindrical groove is smaller than that of the upper cylindrical groove. The diameter of the fixing ring is the same as the inner diameter of the upper cylindrical groove. The lower cylindrical groove can be used to limit the first spring and improve the stability of the first spring.

[0019] In one possible implementation, the shaft is a damped shaft, and the damped shaft is an adjustable damped shaft.

[0020] In one possible implementation, a first spring is sleeved inside the lower cylindrical groove outside the connecting column. The top of the first spring contacts the bottom of the fixing ring. The first spring, together with the fixing ring, can have an upward reset effect on the connecting column, so that when the patient steps on the pedal, it can provide feedback force to the patient's leg to help the patient carry out leg rehabilitation training.

[0021] In one possible implementation, a plug is connected to the top of the connecting post, and several lateral buffer mechanisms are provided on the outside of the plug located on the top of the fixing ring.

[0022] The lateral buffer mechanism includes a retaining ring, a retaining block, and a limiting groove. The limiting groove is vertically formed inside the fixed box and is connected to the upper cylindrical groove. The retaining ring is located inside the upper cylindrical groove. The retaining block is fixed to the outside of the retaining ring and can slide up and down along the upper cylindrical groove. A chuck is provided in the middle of the inside of the retaining ring, and an insertion hole matching the insertion rod is provided in the middle of the inside of the chuck. Moving blocks are fixed on both sides of the chuck, and fixed blocks are fixed on both sides of the inside of the retaining ring. A limiting ring is fixed between the two fixed blocks. The limiting ring passes through the moving blocks, and the moving blocks can slide along the limiting ring. A third spring is sleeved on the outside of the limiting ring between the moving blocks and the fixed blocks.

[0023] In one possible implementation, retaining rings are fixed both above and below the chuck edge inside the retaining ring.

[0024] In one possible implementation, the middle part of the insertion rod is rectangular, the two sides of the insertion rod are arc-shaped, and the two sides of the arc-shaped insertion rod are provided with threads in the same helical direction. A limit bolt is provided inside the upper cylindrical groove. The bolt rod of the limit bolt is threadedly connected to the insertion rod. A disc is fixed at the bottom of the bolt rod of the limit bolt. The diameter of the disc is larger than the diameter of the retaining ring.

[0025] In one possible implementation, the reset mechanism includes two support plates, which are respectively fixed to the bottom sides of the first limiting plate. A toothed plate is provided on the top of the two support plates. The toothed plate is slidably connected to the support plates via a slide rail. The connecting plate is rotatably connected to the toothed plate via a rotating shaft. A fixing plate is fixed to the bottom of the toothed plate and the bottom of one of the support plates. Several detachable second springs are installed between the two fixing plates.

[0026] In one possible implementation, a plurality of rotating rollers are rotatably connected between the two first limiting plates via a rotating shaft, and the outer surface of the rotating rollers is integrally formed with a plurality of protrusions in a ring array.

[0027] In one possible implementation, a gear is mounted on one side of the roller, the gear meshing with a toothed plate, and an arc-shaped plate is rotatably connected to the top of the first limiting plate via a rotating shaft. The arc-shaped plate is located above the thigh support, and a sponge pad is fixed to the inner wall of the arc-shaped plate.

[0028] Beneficial effects:

[0029] First, the connecting column can move along the lower and upper cylindrical grooves. With the help of the first spring and the fixing ring, after the patient exerts force downward on the pedal, the first spring will tend to return to its original position, thus providing a feedback force to the patient's feet and legs, so that the patient's legs can achieve the effect of exercise.

[0030] Using a damping pivot, patients can rotate their feet up or down to move the ankle joint and perform rehabilitation training. By adjusting the resistance of the damping pivot, it can be matched to patients with different actual needs.

[0031] Secondly, when the foot moves the pedal inward or outward, the connecting column and the plug rod will rotate synchronously. In conjunction with the plug hole, the chuck can rotate, which in turn causes the moving block to rotate along the limit ring. The third spring can resist the movement of the moving block. Therefore, the patient needs to exert force when the foot moves the pedal inward or outward, which can assist in the recovery of the patient's leg in the horizontal direction.

[0032] Since multiple lateral cushioning mechanisms can be installed, users can choose the appropriate exercise intensity. The lateral cushioning mechanism can be limited by the limit bolts, which improves its stability.

[0033] Third, when the second limiting plate rotates around the first limiting plate, the connecting plate will drive the toothed plate to move along the support plate. The second spring and the fixing plate can pull the toothed plate, so that the movement of the toothed plate requires the patient to exert force with their legs, thereby exercising the patient's lower limb joints.

[0034] Similarly, by changing the number of second springs, the device can meet the exercise needs of different patients.

[0035] Fourth, through the combination of the rotating roller and the gear, when the patient exercises his / her legs, the second limiting plate rotates around the first limiting plate, and then the gear plate moves, driving the gear to rotate, which in turn drives the rotating roller to rotate. With the help of the protrusions on the rotating roller, the patient's legs can be massaged while the patient exercises his / her lower limbs, thereby accelerating the blood flow rate in the patient's legs.

[0036] With the addition of an arc-shaped plate and a sponge pad, the patient's thigh can be fixed to the thigh support. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the internal structure of the fixing box of the present invention;

[0039] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0040] Figure 4 This is a top view of the fixing box of the present invention;

[0041] Figure 5 This is a schematic diagram of the internal structure of the retaining ring of the present invention;

[0042] Figure 6This is a cross-sectional view of the retaining ring of the present invention;

[0043] Figure 7 This is a side view of the first limiting plate of the present invention;

[0044] Figure 8 This is a side view of the toothed plate of the present invention.

[0045] Reference numerals: 1. Pedal; 2. Connecting column; 3. Connecting plate; 4. First limiting plate; 5. Arc plate; 6. Sponge pad; 7. Second limiting plate; 8. Fixing box; 9. Strap; 10. Limiting bolt; 11. Damping shaft; 12. Locking block; 13. Limiting groove; 14. Locking ring; 15. Fixing ring; 16. Lower cylindrical groove; 17. First spring; 18. Insert rod; 19. Insertion hole; 20. Retaining ring; 21. Chuck; 22. Fixing block; 23. Limiting ring; 24. Third spring; 25. Moving block; 26. Rotating roller; 27. Protrusion; 28. Toothed plate; 29. ​​Support plate; 30. Fixing plate; 31. Second spring; 32. Upper cylindrical groove; 33. Gear; 34. Support plate. Detailed Implementation

[0046] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0047] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] The technical solution in this application is to solve the above problems, and the overall approach is as follows:

[0050] Example 1:

[0051] The specific structure of this embodiment is as follows: Figure 1 and 3 As shown, a lower limb joint training device for rehabilitation includes:

[0052] The thigh support includes two first limiting plates 4, and a support plate 34 is fixed between the two first limiting plates 4.

[0053] The calf support includes two second limiting plates 7, a fixing box 8 is fixed between the two second limiting plates 7, and the two second limiting plates 7 are respectively rotatably connected to the two first limiting plates 4 through a rotating shaft.

[0054] The pedal 1 is located on one side below the lower leg support. The top of the pedal 1 is equipped with a strap 9 for binding the patient's foot, and the pedal 1 is connected to the fixing box 8 through a lifting mechanism.

[0055] The connecting plate 3 is located between the thigh support and the calf support. One end of the connecting plate 3 is rotatably connected to the fixing box 8 via a rotating shaft, and the other end of the connecting plate 3 is connected to the first limiting plate 4 via a reset mechanism.

[0056] In some examples, the lifting mechanism includes a lower cylindrical groove 16 and an upper cylindrical groove 32, both of which are opened inside the fixed box 8. The upper cylindrical groove 32 is located at the top of the lower cylindrical groove 16. A connecting post 2 is provided between the lower cylindrical groove 16 and the upper cylindrical groove 32, and the lower end of the connecting post 2 extends to the bottom of the fixed box 8.

[0057] The connecting column 2 and the pedal 1 are rotatably connected by a rotating shaft. A fixing ring 15 is fixed inside the upper cylindrical groove 32 on the outside of the connecting column 2. The diameter of the lower cylindrical groove 16 is smaller than the diameter of the upper cylindrical groove 32. The diameter of the fixing ring 15 is the same as the inner diameter of the upper cylindrical groove 32. The lower cylindrical groove 16 can limit the first spring 17 and improve the stability of the first spring 17.

[0058] In some examples, the pivot is a damped pivot 11, which is an adjustable damped pivot.

[0059] In some examples, the interior of the lower cylindrical groove 16 is fitted with a first spring 17 outside the connecting column 2. The top of the first spring 17 contacts the bottom of the fixing ring 15. The first spring 17, together with the fixing ring 15, can have an upward reset effect on the connecting column 2, so that after the patient steps on the pedal 1, it can provide feedback force to the patient's leg to help the patient carry out leg rehabilitation training.

[0060] By adopting the above technical solution:

[0061] The patient places their thigh on top of the thigh support, their lower leg on the lower leg support, and their foot on top of the footplate 1 via strap 9;

[0062] The connecting column 2 can move along the lower cylindrical groove 16 and the upper cylindrical groove 32. With the action of the first spring 17 and the fixing ring 15, after the patient exerts force downward on the pedal 1, the first spring 17 will tend to return to its original position, thereby providing a feedback force to the patient's feet and legs, so that the patient's legs can achieve the effect of exercise.

[0063] Using the damping pivot 11, the patient can rotate their foot upwards or downwards to move the ankle joint and perform rehabilitation training. By adjusting the resistance of the damping pivot 11, it can be matched to patients with different actual needs.

[0064] Example 2:

[0065] The specific structure of this embodiment is as follows: Figure 1-6 As shown, the top of the connecting column 2 is connected to the insertion rod 18, and the outside of the insertion rod 18 is provided with several lateral buffer mechanisms on the top of the fixing ring 15.

[0066] The lateral buffer mechanism includes a retaining ring 14, a retaining block 12, and a limiting groove 13. The limiting groove 13 is vertically opened inside the fixed box 8 and is connected to the upper cylindrical groove 32. The retaining ring 14 is located inside the upper cylindrical groove 32. The retaining block 12 is fixed to the outside of the retaining ring 14 and can slide up and down along the upper cylindrical groove 32. A retaining plate 21 is provided in the middle of the inside of the retaining ring 14. A socket 19 matching the insert rod 18 is opened in the middle of the inside of the retaining plate 21. Moving blocks 25 are fixed on both sides of the retaining plate 21. Fixed blocks 22 are fixed on both sides of the inside of the retaining ring 14. A limiting ring 23 is fixed between the two fixed blocks 22. The limiting ring 23 passes through the moving block 25 and the moving block 25 can slide along the limiting ring 23. A third spring 24 is sleeved on the outside of the limiting ring 23 between the moving block 25 and the fixed block 22.

[0067] In some examples, retaining rings 20 are fixed above and below the edge of the chuck 21 inside the retaining ring 14.

[0068] In some examples, the middle of the insertion rod 18 is rectangular, and the two sides of the insertion rod 18 are arc-shaped. The two sides of the arc-shaped insertion rod 18 are provided with threads in the same helical direction. The upper cylindrical groove 32 is provided with a limit bolt 10. The bolt rod of the limit bolt 10 is threadedly connected to the insertion rod 18. The bottom of the bolt rod of the limit bolt 10 is fixed with a disc. The diameter of the disc is larger than the diameter of the retaining ring 20.

[0069] By adopting the above technical solution:

[0070] When the patient places their foot on pedal 1, the foot causes pedal 1 to rotate inward or outward, which allows the entire lower limb joint to rotate in the horizontal direction, thereby achieving the effect of exercise.

[0071] When the pedal 1 is flipped inward or outward, the connecting column 2 and the insertion rod 18 rotate synchronously. Since the insertion rod 18 has a racetrack-shaped structure, it can drive the chuck 21 to rotate when it is inserted into the insertion hole 19. When the chuck 21 rotates, the moving block 25 will rotate along the limiting ring 23. The third spring 24 can resist the movement of the moving block 25. The locking block 12 and the limiting groove 13 can make the locking ring 14 and the fixing box 8 form a whole. Therefore, when the patient's foot drives the pedal 1 to flip inward or outward, force is required, which can play an auxiliary role in the recovery of the patient's leg in the horizontal direction.

[0072] Because multiple lateral cushioning mechanisms can be installed, users can choose the appropriate exercise intensity for themselves.

[0073] The limiting bolt 10 can limit the lateral buffer mechanism, thereby improving its stability.

[0074] Example 3:

[0075] The specific structure of this embodiment is as follows: Figure 7-8 As shown, the reset mechanism includes two support plates 29, which are fixed to the bottom sides of the first limiting plate 4 respectively. A toothed plate 28 is provided on the top of the two support plates 29. The toothed plate 28 and the support plates 29 are slidably connected by a slide rail. The connecting plate 3 and the toothed plate 28 are rotatably connected by a rotating shaft. A fixing plate 30 is fixed to the bottom of the toothed plate 28 and the bottom of one of the support plates 29. Several detachable second springs 31 are installed between the two fixing plates 30.

[0076] Through the above technical solution:

[0077] When in use, since the lower leg support and the thigh support are connected by a pivot, the joints of the patient's thigh and lower leg can be exercised when the lower leg support rotates.

[0078] When the second limiting plate 7 rotates around the first limiting plate 4, the connecting plate 3 will drive the toothed plate 28 to move along the support plate 29. The second spring 31 and the fixing plate 30 can pull the toothed plate 28, so that the movement of the toothed plate 28 requires the patient's leg to exert force, thereby exercising the patient's lower limb joints.

[0079] Similarly, by changing the number of second springs 31, the device can meet the exercise needs of different patients.

[0080] Example 4:

[0081] The specific structure of this embodiment is as follows: Figure 7-8 As shown, several rotating rollers 26 are rotatably connected between the two first limiting plates 4 via a rotating shaft. The outer surface of the rotating rollers 26 is integrally formed with several protrusions 27 in a ring array.

[0082] In some examples, a gear 33 is installed on one side of the roller 26, and the gear 33 meshes with the toothed plate 28. The top of the first limiting plate 4 is rotatably connected to an arc plate 5 via a rotating shaft. The arc plate 5 is located above the thigh support, and a sponge pad 6 is fixed to the inner wall of the arc plate 5.

[0083] Through the above technical solution:

[0084] In use, the rotating roller 26 works with the gear 33. When the patient exercises his legs, the second limiting plate 7 rotates around the first limiting plate 4. As the toothed plate 28 moves, it can drive the gear 33 to rotate, which in turn drives the rotating roller 26 to rotate. With the help of the protrusion 27 on the rotating roller 26, the patient's legs can be massaged while exercising his lower limbs, thereby accelerating the blood flow rate in the patient's legs.

[0085] With the curved plate 5 and the sponge pad 6, the patient's thigh can be fixed on the thigh support.

[0086] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A lower limb joint training device for rehabilitation, characterized in that, include: Thigh support, the thigh support includes two first limiting plates (4), and a support plate (34) is fixed between the two first limiting plates (4); The lower leg support includes two second limiting plates (7), a fixing box (8) is fixed between the two second limiting plates (7), and the two second limiting plates (7) are respectively rotatably connected to the two first limiting plates (4) through a rotating shaft; The pedal (1) is located on one side below the lower leg support. The top of the pedal (1) is equipped with a strap (9) for binding the patient's foot, and the pedal (1) is connected to the fixing box (8) through a lifting mechanism. Connecting plate (3), the connecting plate (3) is located between the thigh support and the calf support, one end of the connecting plate (3) is rotatably connected to the fixing box (8) through a rotating shaft, and the other end of the connecting plate (3) is connected to the first limiting plate (4) through a reset mechanism; The lifting mechanism includes a lower cylindrical groove (16) and an upper cylindrical groove (32). Both the lower cylindrical groove (16) and the upper cylindrical groove (32) are located inside the fixed box (8). The upper cylindrical groove (32) is located at the top of the lower cylindrical groove (16). A connecting column (2) is provided between the lower cylindrical groove (16) and the upper cylindrical groove (32). The lower end of the connecting column (2) extends to the bottom of the fixed box (8). The connecting column (2) is rotatably connected to the pedal (1) through a rotating shaft. A fixing ring (15) is fixed inside the upper cylindrical groove (32) on the outside of the connecting column (2). The diameter of the lower cylindrical groove (16) is smaller than the diameter of the upper cylindrical groove (32). The diameter of the fixing ring (15) is the same as the inner diameter of the upper cylindrical groove (32). The top of the connecting column (2) is connected to a plug rod (18), and the outside of the plug rod (18) is provided with several lateral buffer mechanisms on the top of the fixing ring (15); the lateral buffer mechanism includes a retaining ring (14), a retaining block (12) and a limiting groove (13), the limiting groove (13) is vertically opened inside the fixing box (8), and the limiting groove (13) is connected to the upper cylindrical groove (32), the retaining ring (14) is located inside the upper cylindrical groove (32), the retaining block (12) is fixed to the outside of the retaining ring (14), and the retaining block (12) can slide up and down along the upper cylindrical groove (32), the retaining ring (14) A chuck (21) is provided in the middle of the interior of the chuck (21), and an insertion hole (19) matching the insertion rod (18) is opened in the middle of the interior of the chuck (21). Moving blocks (25) are fixed on both sides of the chuck (21), and fixing blocks (22) are fixed on both sides of the interior of the retaining ring (14). A limiting ring (23) is fixed between the two fixing blocks (22). The limiting ring (23) passes through the moving block (25), and the moving block (25) can slide along the limiting ring (23). A third spring (24) is sleeved on the outside of the limiting ring (23) between the moving block (25) and the fixing block (22). The retaining ring (14) has retaining rings (20) fixed above and below the edge of the chuck (21) inside; the middle of the insert rod (18) is rectangular, the two sides of the insert rod (18) are arc-shaped, and the two sides of the arc-shaped insert rod (18) are provided with threads in the same helical direction; the upper cylindrical groove (32) is provided with a limit bolt (10), the bolt rod of the limit bolt (10) is threaded to the insert rod (18), and a disc is fixed at the bottom of the bolt rod of the limit bolt (10), the diameter of the disc is larger than the diameter of the retaining ring (20).

2. The lower limb joint training device for rehabilitation as described in claim 1, characterized in that: The rotating shaft is a damping rotating shaft (11).

3. The lower limb joint training device for rehabilitation as described in claim 1, characterized in that: The lower cylindrical groove (16) is fitted with a first spring (17) outside the connecting column (2), and the top of the first spring (17) is in contact with the bottom of the fixing ring (15).

4. The lower limb joint training device for rehabilitation as described in claim 1, characterized in that: The reset mechanism includes two support plates (29), which are fixed to the bottom sides of the first limiting plate (4) respectively. A toothed plate (28) is provided on the top of the two support plates (29). The toothed plate (28) and the support plates (29) are slidably connected by a slide rail. The connecting plate (3) and the toothed plate (28) are rotatably connected by a rotating shaft. A fixing plate (30) is fixed to the bottom of the toothed plate (28) and the bottom of one of the support plates (29). Several detachable second springs (31) are installed between the two fixing plates (30).

5. The lower limb joint training device for rehabilitation as described in claim 1, characterized in that: A plurality of rotating rollers (26) are rotatably connected between the two first limiting plates (4) via a rotating shaft. The outer side of the rotating rollers (26) is integrally formed with a plurality of protrusions (27) in a ring array.

6. The lower limb joint training device for rehabilitation as described in claim 5, characterized in that: A gear (33) is installed on one side of the roller (26), and the gear (33) meshes with the toothed plate (28). An arc plate (5) is rotatably connected to the top of the first limiting plate (4) through a rotating shaft. The arc plate (5) is located above the thigh support, and a sponge pad (6) is fixed on the inner wall of the arc plate (5).

Images