Postoperative knee joint rehabilitation physiotherapy device

Abstract

The application relates to the technical field of rehabilitation training, and discloses a postoperative knee joint rehabilitation physiotherapy device, which comprises a bottom plate, a slidable sliding plate arranged on the bottom plate, an outer shell fixed on the sliding plate and a through opening arranged on the outer shell; wherein a foot supporting assembly is arranged on the outer shell, and the foot supporting assembly comprises a first rotating shaft, two mounting discs, two connecting rods and two foot pedals. The innovative design of the cross stretching and synchronous stretching modes can simulate the action of pedaling a bicycle to enhance the joint flexibility and muscle coordination, and can realize the synchronous movement of the two legs through the foot pedals, accurately reproduce the bilateral joint linkage required by the daily squatting, going upstairs and downstairs and other actions, and the two modes can be alternately used to avoid muscle imbalance caused by single training.

Description

Technical Field

[0001] This invention relates to the field of rehabilitation training technology, and in particular to a postoperative knee joint rehabilitation physiotherapy device. Background Technology

[0002] Postoperative knee rehabilitation devices play a crucial role in promoting joint function recovery and reducing pain and swelling.

[0003] A search revealed that Chinese Patent CN113786312A discloses a rehabilitation device for patients after total knee replacement surgery. The device includes a housing, a reversing mechanism, a first foot pedal, a second foot pedal, and a reciprocating drive mechanism. The reversing mechanism is located inside the housing and has a first drive end and a second drive end, with opposite rotation directions. The first and second foot pedals are located on opposite sides of the housing and are both connected to the reversing mechanism. This design allows patients to perform knee flexion and extension movements, providing sufficient training and improving knee rehabilitation. Furthermore, it is small in size and simple in structure, making it suitable for use in a hospital bed. However, in practical use, this design still has the following shortcomings:

[0004] The above-mentioned program only includes training methods involving alternating leg bending, similar to cycling, and cannot achieve synchronous leg bending training. Due to the lack of a design for synchronous leg bending training, patients cannot achieve diversified stimulation of joint movement patterns during rehabilitation. It is impossible to specifically strengthen the coordination of both knee joints, nor can it simulate scenarios in daily activities such as squatting, climbing stairs, etc., which require simultaneous force exertion of both legs. This leads to reduced efficiency in muscle strength recovery and joint function reconstruction. In addition, a single training mode may cause overuse of specific muscle groups while other muscle groups are not adequately exercised. Long-term use may lead to muscle imbalance and increase the risk of secondary injury. At the same time, this functional limitation may also lead to a longer rehabilitation period for patients, requiring more auxiliary means or extending treatment time, indirectly increasing medical costs and the burden on patients.

[0005] Therefore, it is necessary to design postoperative knee joint rehabilitation physiotherapy devices to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a postoperative knee joint rehabilitation physiotherapy device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Postoperative knee joint rehabilitation physiotherapy device includes a base plate, on which a sliding plate is provided, and an outer shell is fixed on the sliding plate. An opening is provided on the outer shell.

[0009] The outer shell is provided with a foot support assembly, which includes a first pivot, two mounting plates, two connecting rods and two foot pedals.

[0010] The housing is equipped with a rotating component and a moving component. The rotating component is used to drive the two foot pedals to rotate, and the moving component is used to drive the two foot pedals to move.

[0011] The outer casing is provided with a drive assembly for driving the rotating assembly and the moving assembly to operate. The drive assembly includes a first shaft, a first drive block, a second shaft, and a second drive block. The cross-sections of the first shaft and the second shaft are circular, and the cross-sections of the first drive block and the second drive block are rectangular.

[0012] The outer casing is provided with an adjustment component for adjusting the drive component.

[0013] As a preferred embodiment of the present invention, the first rotating shaft is rotatably installed inside the outer casing, and both ends of the first rotating shaft extend to the outside of the outer casing. The two mounting plates are respectively fixed to the two ends of the first rotating shaft. One end of the two connecting rods is connected to the two mounting plates respectively, and the other end of the two connecting rods is connected to the two foot pedals respectively. One of the connecting rods is connected to the corresponding mounting plate through a connecting component.

[0014] As a preferred embodiment of the present invention, the rotating assembly includes a first gear, a second rotating shaft, and a second gear. The second rotating shaft is rotatably installed inside the outer casing. One end of the second rotating shaft has a slot. The first gear is fixedly sleeved on the first rotating shaft, and the second gear is fixedly sleeved on the second rotating shaft. The first gear and the second gear mesh with each other.

[0015] As a preferred embodiment of the present invention, the connecting assembly includes a connecting cylinder, a slider, and a rotating plate. The connecting cylinder is fixed at the center of the side of the mounting plate. The slider slides in the connecting cylinder, with one end extending to the outside of the connecting cylinder and connected to the connecting rod. The rotating plate is rotatably mounted inside the connecting cylinder. The slider and the rotating plate are connected by a connecting spring. The connecting cylinder has two opposing slots, and the slider has two opposing protrusions fixed on it. The two protrusions are respectively engaged in the two slots.

[0016] As a preferred embodiment of the present invention, the moving component includes a third rotating shaft, a third gear, and a rack. The third rotating shaft is rotatably mounted inside the outer casing. A through-hole is provided on the third rotating shaft, and the through-hole is directly opposite the slot. The third gear is fixedly sleeved on the third rotating shaft. The rack meshes with the third gear. Both ends of the rack are connected to the base plate through two connecting plates. An clearance opening adapted to the rack is provided on the outer casing, and the rack passes through the clearance opening.

[0017] As a preferred embodiment of the present invention, the drive assembly further includes a cylindrical shaft, a fourth gear, a servo motor, and a fifth gear. The cylindrical shaft is rotatably mounted inside the outer casing. The cylindrical shaft has a rectangular cross-section. The fourth gear is fixedly sleeved on the cylindrical shaft. The servo motor is mounted inside the outer casing. The fifth gear is fixedly sleeved on the output shaft of the servo motor. The fifth gear and the fourth gear mesh with each other. A hole is provided on the cylindrical shaft. The first shaft passes through the hole, and the first drive block slides in the cylindrical shaft.

[0018] As a preferred embodiment of the present invention, the cylindrical shaft, the third rotating shaft, the second rotating shaft, the first shaft rod, the first driving block, the second shaft rod, and the second driving block are arranged coaxially.

[0019] As a preferred embodiment of the present invention, the adjusting assembly includes an adjusting screw, an adjusting plate, an adjusting bracket, and a sleeve plate. The adjusting screw is rotatably installed inside the outer casing, and one end of the adjusting screw extends to the outside of the outer casing. The adjusting plate is threaded onto the adjusting screw, and the top end of the adjusting plate extends into the through-hole and slides within the through-hole. The adjusting bracket is fixed to the bottom end of the adjusting plate and has a U-shaped structure. The sleeve plate is fixedly fitted onto the end of the first shaft away from the first driving block, and the adjusting bracket is fitted onto the sleeve plate.

[0020] As a preferred embodiment of the present invention, the adjusting frame is equipped with two ball bearings, which are located on both sides of the sleeve plate.

[0021] As a preferred embodiment of the present invention, two marking lines are provided on the outer shell, and a reference line is provided on the adjustment plate for feedback of the position of the adjustment plate.

[0022] The present invention has the following beneficial effects:

[0023] 1. Through the innovative design of cross-extension and synchronous extension modes, it not only simulates the action of cycling to enhance joint flexibility and muscle coordination, but also realizes the synchronous movement of both legs through the adjustment of the foot pedals. It accurately reproduces the bilateral joint linkage required for daily squatting, climbing stairs and other actions. The alternation of the two modes can avoid muscle imbalance caused by single training, promote joint fluid circulation to reduce swelling, and accelerate ligament repair and bone healing through targeted strength training, significantly improving rehabilitation efficiency and shortening the treatment cycle.

[0024] 2. The second drive block is driven by a single servo motor through gear transmission, which eliminates the complex structure of configuring motors separately for different modes, significantly reduces the size and weight of the device, reduces manufacturing costs, and avoids synchronization error problems that may be caused by multi-motor collaborative control by a unified power source, ensuring stable and accurate power output, while reducing the risk of secondary damage caused by mechanical failure and improving treatment safety.

[0025] 3. By adjusting the transmission structure of screw-adjusting plate-adjusting frame-sleeve plate, the operator only needs to turn the screw to quickly switch the position of the second drive block, realizing intuitive and efficient operation of mode switching. The ball bearing design in the adjusting frame effectively reduces the friction and wear between components, extending the service life of the equipment while reducing maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the postoperative knee joint rehabilitation physiotherapy device proposed in this invention;

[0027] Figure 2 for Figure 1 Enlarged view of the structure at point A;

[0028] Figure 3 This is a cross-sectional structural diagram of the postoperative knee joint rehabilitation physiotherapy device proposed in this invention.

[0029] Figure 4 A schematic diagram of the foot support assembly, rotation assembly, and drive assembly;

[0030] Figure 5 for Figure 4 Enlarged view of the structure at point B;

[0031] Figure 6 Schematic diagram of the cross-sectional structure of the driving component Figure 1 ;

[0032] Figure 7 Schematic diagram of the cross-sectional structure of the driving component Figure 2 ;

[0033] Figure 8 This is a cross-sectional view of the first rotating shaft.

[0034] Figure 9 for Figure 8 Enlarged view of the structure at point C;

[0035] Figure 10 A schematic diagram of the structure of the adjustment component;

[0036] Figure 11 for Figure 10 Enlarged view of the structure at point D.

[0037] In the diagram: 11. Base plate; 12. Sliding plate; 13. Outer shell; 131. Through port; 21. First rotating shaft; 22. First gear; 23. Second rotating shaft; 231. Slot; 24. Second gear; 25. Mounting plate; 26. Connecting rod; 27. Foot pedal; 31. Connecting cylinder; 32. Slider; 33. Slot; 34. Protrusion; 35. Rotating plate; 36. Connecting spring; 41. Third rotating shaft; 411. Through port; 42. Third gear; 43. Rack; 44. Connecting plate; 51. Cylinder shaft; 52. Fourth gear; 53. Servo motor; 54. Fifth gear; 55. First shaft; 56. First drive block; 57. Second shaft; 58. Second drive block; 61. Adjusting screw; 62. Adjusting plate; 63. Adjusting frame; 631. Ball bearing; 64. Sleeve plate. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Reference Figure 1-11 The postoperative knee joint rehabilitation physiotherapy device includes a base plate 11, a sliding plate 12 is provided on the base plate 11, an outer shell 13 is fixed on the sliding plate 12, and an opening 131 is provided on the outer shell 13.

[0040] A foot support assembly is provided on the outer shell 13. The foot support assembly includes a first rotating shaft 21, two mounting plates 25, two connecting rods 26 and two foot pedals 27. The first rotating shaft 21 is rotatably installed inside the outer shell 13, and both ends of the first rotating shaft 21 extend to the outside of the outer shell 13. The two mounting plates 25 are respectively fixed to the two ends of the first rotating shaft 21. One end of the two connecting rods 26 is connected to the two mounting plates 25 respectively, and the other end of the two connecting rods 26 is connected to the two foot pedals 27 respectively.

[0041] One of the connecting rods 26 is connected to the corresponding mounting plate 25 via a connecting assembly. The connecting assembly includes a connecting cylinder 31, a slider 32, and a rotating plate 35. The connecting cylinder 31 is fixed at the center of the side of the mounting plate 25. The slider 32 slides in the connecting cylinder 31. One end of the slider 32 extends to the outside of the connecting cylinder 31 and is connected to the connecting rod 26. The rotating plate 35 is rotatably installed inside the connecting cylinder 31. The slider 32 and the rotating plate 35 are connected by a connecting spring 36. The connecting cylinder 31 has two opposing slots 33. The slider 32 has two opposing protrusions 34 fixed on it. The two protrusions 34 are respectively engaged in the two slots 33.

[0042] The housing 13 is equipped with a rotating component and a moving component. The rotating component is used to drive the two foot pedals 27 to rotate. The rotating component includes a first gear 22, a second rotating shaft 23 and a second gear 24. The second rotating shaft 23 is rotatably installed inside the housing 13. One end of the second rotating shaft 23 is provided with a slot 231. The first gear 22 is fixedly sleeved on the first rotating shaft 21 and the second gear 24 is fixedly sleeved on the second rotating shaft 23. The first gear 22 and the second gear 24 mesh with each other.

[0043] The moving assembly is used to drive the two foot pedals 27 to move. The moving assembly includes a third rotating shaft 41, a third gear 42 and a rack 43. The third rotating shaft 41 is rotatably installed inside the outer casing 13. The third rotating shaft 41 has a through-hole 411, which is directly opposite the slot 231. The third gear 42 is fixedly sleeved on the third rotating shaft 41. The rack 43 meshes with the third gear 42. The two ends of the rack 43 are connected to the base plate 11 through two connecting plates 44. The outer casing 13 has a clearance opening adapted to the rack 43, through which the rack 43 passes.

[0044] A drive assembly is provided on the outer casing 13 for driving the rotating and moving components. The drive assembly includes a first shaft 55, a first drive block 56, a second shaft 57, and a second drive block 58. The cross-sections of the first shaft 55 and the second shaft 57 are circular, while the cross-sections of the first drive block 56 and the second drive block 58 are rectangular. The drive assembly also includes a cylindrical shaft 51, a fourth gear 52, a servo motor 53, and a fifth gear 54. The cylindrical shaft 51 is rotatably mounted inside the outer casing 13, and the cross-section of the cylindrical shaft 51's opening is rectangular. The fourth gear 52 is fixedly sleeved on the cylindrical shaft 51, the servo motor 53 is installed inside the outer casing 13, the fifth gear 54 is fixedly sleeved on the output shaft of the servo motor 53, the fifth gear 54 and the fourth gear 52 mesh with each other, the cylindrical shaft 51 has a hole, the first shaft 55 passes through the hole, the first drive block 56 slides in the cylindrical shaft 51, the cylindrical shaft 51, the third rotating shaft 41, the second rotating shaft 23, the first shaft 55, the first drive block 56, the second shaft 57 and the second drive block 58 are arranged coaxially;

[0045] The postoperative knee joint rehabilitation physiotherapy device proposed in this invention has two physiotherapy modes: cross-extension physiotherapy and synchronous extension physiotherapy. Specifically, during cross-extension physiotherapy, as follows: Figure 6 As shown, when the second drive block 58 is located in the slot 231 and the second shaft 57 is located in the through opening 411, the second drive block 58 can drive the second rotating shaft 23 to rotate, but the second shaft 57 will not drive the third rotating shaft 41 to rotate. That is, the second rotating shaft 23 rotates, but the third rotating shaft 41 does not rotate. In this case, the second rotating shaft 23 will drive the first rotating shaft 21 to rotate through the meshing second gear 24 and the first gear 22. When the first rotating shaft 21 rotates, the two mounting plates 25 rotate accordingly, and drive the two foot pedals 27 to rotate through the two connecting rods 26. The two foot pedals 27 are in a state of mutual misalignment. When the patient's feet step on the two foot pedals 27, the synchronous rotation of the two foot pedals 27 can drive the patient's legs to perform a cross-stretching movement, similar to the action of riding a bicycle. This is cross-stretching physiotherapy.

[0046] During synchronized stretching therapy, the staff first adjusts the position of one of the foot pedals 27 so that the two foot pedals 27 are directly opposite each other. This allows the patient's legs to maintain simultaneous extension or bending when both feet are on the foot pedals 27. Specifically, as follows: Figure 9 As shown, when adjusting the position of the foot pedal 27, the operator first pulls the foot pedal 27, causing the foot pedal 27 to move the corresponding connecting rod 26. When the connecting rod 26 moves, it can move the slider 32. The two protrusions 34 on the slider 32 move accordingly until the two protrusions 34 disengage from the two slots 33 respectively. Without the restriction of the two slots 33, the slider 32 can rotate freely. At this time, the operator rotates the foot pedal 27, causing the foot pedal 27 to rotate 180°. At this time, the positions of the two protrusions 34 are reversed and they are aligned with the two slots 33 again. Finally, the operator releases the foot pedal 27, causing the slider 32 to reset under the action of the connecting spring 36. When the slider 32 resets, the two protrusions 34 are engaged in the two slots 33, thus fixing the position of the connecting rod 26. After completing the above adjustment, the two foot pedals 27 will be aligned with each other.

[0047] Furthermore, the staff adjusts the positions of the first drive block 56 and the second drive block 58, so that the second drive block 58 disengages from the slot 231 and moves into the through opening 411. In this case, when the first drive block 56 rotates, it can drive the third rotating shaft 41 to rotate, while the second rotating shaft 23 cannot rotate. When the third rotating shaft 41 rotates, the third gear 42 on it rotates accordingly and moves under the action of the rack 43. This causes the outer shell 13 to move as a whole and drives the two foot pedals 27 to move. During this process, the patient's legs can perform synchronous extension and bending movements, which is synchronous extension physiotherapy.

[0048] Based on the above process, the postoperative knee joint rehabilitation physiotherapy device proposed in this invention provides a more comprehensive rehabilitation plan for patients' knee joint recovery through a dual-mode design of cross-extension and synchronous extension: the cross-extension mode simulates cycling motion, promotes joint flexibility recovery through leg misalignment movement, and enhances the coordination of quadriceps and hamstrings. The synchronous extension mode adjusts the position of the foot pedal 27 to enable the legs to bend or extend synchronously, simulating the bilateral joint linkage required for daily squatting, climbing stairs and other movements, effectively strengthening the overall muscle group strength of the lower limbs and improving joint stability. The alternation of the two modes can avoid muscle imbalance caused by single training. It accelerates joint fluid circulation to reduce swelling through diversified exercise stimulation, and promotes ligament repair and bone healing through targeted strength training, ultimately significantly improving rehabilitation efficiency, shortening the treatment cycle, and reducing the risk of secondary injury caused by single exercise mode.

[0049] An adjustment assembly is provided on the outer casing 13 for adjusting the drive assembly. The adjustment assembly includes an adjustment screw 61, an adjustment plate 62, an adjustment frame 63, and a sleeve plate 64. The adjustment screw 61 is rotatably installed inside the outer casing 13, and one end of the adjustment screw 61 extends to the outside of the outer casing 13. The adjustment plate 62 is threaded onto the adjustment screw 61, and the top end of the adjustment plate 62 extends into the through-hole 131 and slides in the through-hole 131. Two marking lines are provided on the outer casing 13, and a reference line is provided on the adjustment plate 62 for feedback on the position of the adjustment plate 62. During adjustment, the operator can accurately control the position of the second drive block 58 through the reference line and the two marking lines. The adjustment frame 63 is fixed to the bottom end of the adjustment plate 62 and has a U-shaped structure. The sleeve plate 64 is fixedly sleeved on the end of the first shaft 55 away from the first drive block 56. The adjustment frame 63 is sleeved on the sleeve plate 64, and two ball bearings 631 are installed on the adjustment frame 63. The two ball bearings 631 are located on both sides of the sleeve plate 64.

[0050] Both of these physiotherapy methods rely on the rotation of the second drive block 58 as the power source. The second drive block 58 is driven by the servo motor 53. Specifically, when the second drive block 58 is located in the slot 231 or the through-hole 411, the first drive block 56 is located in the cylindrical shaft 51. At this time, the cylindrical shaft 51 can drive the first drive block 56 to rotate, thereby causing the second drive block 58 to rotate. The cylindrical shaft 51 and the output shaft of the servo motor 53 are also transmitted through the meshing fourth gear 52 and fifth gear 54. Therefore, when the servo motor 53 is running, it can drive the cylindrical shaft 51 to rotate and drive the second drive block 58 to rotate. This structure eliminates the complex design of configuring motors separately for different modes, significantly reducing the size, weight and manufacturing cost of the device. At the same time, it avoids the synchronization error problem that may be caused by multi-motor collaborative control. In addition, the operator only needs to simply adjust the position of the second drive block 58 to complete the mode conversion, making the operation intuitive and efficient.

[0051] The adjustment assembly is used to adjust the position of the second drive block 58. Specifically, when the operator rotates the adjustment screw 61, the adjustment screw 61 can drive the adjustment plate 62 to move. The adjustment plate 62 drives the adjustment frame 63 to move. When the adjustment frame 63 moves, it can drive the first shaft 55 to move through the sleeve plate 64. When the first shaft 55 moves, the second drive block 58 moves accordingly. Therefore, the operator can adjust the position of the second drive block 58 by rotating the adjustment screw 61. Furthermore, the adjustment frame 63 is provided with two rolling balls 631. The two balls 631 are provided to reduce the friction between the adjustment frame 63 and the sleeve plate 64, thereby reducing the wear between the two.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A post-operative knee rehabilitation physiotherapy device, characterized in that, The utility model provides a kind of foot rest, including bottom plate (11), the bottom plate (11) is provided with slidable sliding plate (12), the outer shell (13) is fixed on the sliding plate (12), and the outer shell (13) is provided with through opening (131); Wherein, the outer shell (13) is provided with foot support assembly, the foot support assembly includes first rotating shaft (21), two mounting discs (25), two connecting rods (26) and two foot pedals (27); The inside of the outer shell (13) is provided with rotating assembly and moving assembly, the rotating assembly is used to drive two foot pedals (27) to rotate, and the moving assembly is used to drive two foot pedals (27) to move; The outer shell (13) is provided with driving assembly for driving the rotating assembly and moving assembly to operate, the driving assembly includes first shaft (55), first driving block (56), second shaft (57) and second driving block (58), the cross section of the first shaft (55) and the second shaft (57) is circular, and the cross section of the first driving block (56) and the second driving block (58) is rectangular; The outer shell (13) is provided with adjusting assembly for adjusting the driving assembly; The rotating assembly includes first gear (22), second rotating shaft (23) and second gear (24), the second rotating shaft (23) is rotatably installed in the outer shell (13), one end of the second rotating shaft (23) is provided with slot (231), the first gear (22) is fixedly sleeved on the first rotating shaft (21), the second gear (24) is fixedly sleeved on the second rotating shaft (23), and the first gear (22) and the second gear (24) are engaged with each other; The moving assembly includes third rotating shaft (41), third gear (42) and rack (43), the third rotating shaft (41) is rotatably installed in the outer shell (13), the third rotating shaft (41) is provided with through hole (411), and the through hole (411) is opposite to the slot (231), the third gear (42) is fixedly sleeved on the third rotating shaft (41), the rack (43) is engaged with the third gear (42), the both ends of the rack (43) are connected with the bottom plate (11) through two connecting plates (44), the outer shell (13) is provided with avoiding opening matched with the rack (43), and the rack (43) passes through the avoiding opening; The driving assembly further comprises a cylinder shaft (51), a fourth gear (52), a servo motor (53) and a fifth gear (54), the cylinder shaft (51) is rotatably installed in the inner part of the outer shell (13), the cylinder opening section of the cylinder shaft (51) is rectangular, the fourth gear (52) is fixedly sleeved on the cylinder shaft (51), the servo motor (53) is installed in the inner part of the outer shell (13), the fifth gear (54) is fixedly sleeved on the output shaft of the servo motor (53), the fifth gear (54) and the fourth gear (52) are in mesh with each other, a hole position is formed in the cylinder shaft (51), the first shaft rod (55) passes through the hole position, and the first driving block (56) slides in the cylinder shaft (51). The cylinder shaft (51), the third rotating shaft (41), the second rotating shaft (23), the first shaft rod (55), the first driving block (56), the second shaft rod (57) and the second driving block (58) are coaxially arranged.

2. The post-operative knee rehabilitation physiotherapy device according to claim 1, wherein, The first rotating shaft (21) is rotatably installed in the inner part of the outer shell (13), both ends of the first rotating shaft (21) extend to the outside of the outer shell (13), the two mounting discs (25) are fixed at both ends of the first rotating shaft (21), one end of each of the two connecting rods (26) is connected with the two mounting discs (25) respectively, and the other end of each of the two connecting rods (26) is connected with the two foot pedals (27) respectively, and one of the connecting rods (26) and the corresponding mounting disc (25) are connected through a connecting assembly.

3. The post-operative knee rehabilitation therapy apparatus according to claim 2, wherein, The connecting assembly comprises a connecting cylinder (31), a sliding block (32) and a rotating plate (35), the connecting cylinder (31) is fixed at the central position of the side surface of the mounting disc (25), the sliding block (32) slides in the connecting cylinder (31), one end of the sliding block (32) extends to the outside of the connecting cylinder (31) and is connected with the connecting rod (26), the rotating plate (35) is rotatably installed in the inner part of the connecting cylinder (31), the sliding block (32) and the rotating plate (35) are connected through a connecting spring (36), two oppositely arranged clamping grooves (33) are formed in the connecting cylinder (31), and two oppositely arranged protrusions (34) are fixed on the sliding block (32), and the two protrusions (34) are clamped in the two clamping grooves (33) respectively.

4. The post-operative knee rehabilitation therapy apparatus as claimed in claim 1, wherein, The adjusting assembly comprises an adjusting screw rod (61), an adjusting plate (62), an adjusting frame (63) and a sleeve plate (64), the adjusting screw rod (61) is rotatably installed in the inner part of the outer shell (13), one end of the adjusting screw rod (61) extends to the outside of the outer shell (13), the adjusting plate (62) is threadedly sleeved on the adjusting screw rod (61), the top end of the adjusting plate (62) extends to and slides in the through opening (131), the adjusting frame (63) is fixed at the bottom end of the adjusting plate (62), the adjusting frame (63) is in a U-shaped structure, the sleeve plate (64) is fixedly sleeved on one end of the first shaft rod (55) away from the first driving block (56), and the adjusting frame (63) is sleeved on the sleeve plate (64).

5. The post-operative knee rehabilitation therapy apparatus according to claim 4, wherein, Two balls (631) are installed on the adjusting frame (63), and the two balls (631) are respectively located on the two sides of the sleeve plate (64).

6. The post-operative knee rehabilitation therapy apparatus as claimed in claim 4, wherein, Two identification lines are arranged on the outer shell (13), and a reference line is arranged on the adjusting plate (62), so as to feedback the position of the adjusting plate (62).

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