Knee joint rehabilitation device

Abstract

The present application relates to the technical field of medical rehabilitation device, and more specifically discloses a knee joint rehabilitation device, which comprises a support component, the support component comprises a support bottom plate, the support bottom plate is connected with a seat plate through a support column, the seat plate is provided with a support plate on both sides, the seat plate is rotatably connected with an axis suspension assembly on the inner side, the axis suspension assembly comprises a third motor, a rotating ring and a coil spring, the third motor drives the rotating ring, the rotating ring is connected with a rotating shaft through the coil spring, the rotating shaft is movably connected with a knee joint rotating plate on the outer side, the knee joint rotating plate is provided with a first moving assembly on the bottom, a blocking hole assembly is slidably arranged in the interior, and the bottom of the knee joint rotating plate is also movably connected with a blowing assembly, the axis suspension assembly is arranged, the elasticity of the coil spring is utilized to make the rotating shaft move dynamically in the movement process of the knee joint of the patient, the change of the instantaneous rotation center of the knee joint is adapted, and secondary injury caused by the fixed axis is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical rehabilitation device technology, and more specifically to a knee joint rehabilitation device. Background Technology

[0002] Knee joint rehabilitation training is one of the important means for patients with lower limb dysfunction to restore their walking ability. In the existing technology, there are a variety of knee joint rehabilitation devices to assist patients in flexion and extension training. They usually use motor drive or mechanical structure to achieve passive or active training. However, most of the existing devices use a fixed axis structure, which cannot adapt to the physiological characteristics of the instantaneous dynamic change of the center of rotation of the human knee joint during flexion and extension, and can easily lead to secondary knee joint injury.

[0003] Furthermore, traditional rehabilitation devices lack consideration for patient comfort during training, especially during prolonged sessions, which can easily lead to discomfort in the knee joint. While some devices may have air cushions or massage structures, they cannot dynamically adjust the airflow intensity or training torque according to the patient's recovery progress, resulting in unsatisfactory rehabilitation outcomes.

[0004] Therefore, there is an urgent need for a knee joint rehabilitation device that can adapt to the dynamic movement of the knee joint, adjust the training intensity according to the degree of rehabilitation, and improve comfort, in order to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a knee joint rehabilitation device to solve the problems existing in the background art.

[0006] This invention provides the following technical solution: a knee joint rehabilitation device, comprising a support component, the support component including a support base plate, a seat plate connected to the support base plate via a support column, support plates on both sides of the seat plate, and a centrally suspended assembly rotatably connected to the inner side of the seat plate, the centrally suspended assembly including a third motor, a rotating ring, and a coil spring, the third motor driving the rotating ring, the rotating ring being connected to a rotating shaft via the coil spring, a knee joint rotating plate movably connected to the outer side of the rotating shaft, a first moving component installed at the bottom of the knee joint rotating plate, a stop hole component slidably installed inside, and a movably connected component at the bottom of the knee joint rotating plate. The device is equipped with an air blowing assembly, which includes a cylinder and a piston rod. The cylinder is fixed to a support base plate, and the piston rod is connected to a knee joint rotating plate via a lower and upper hanging ring. T-shaped blocks on both sides of the piston rod are slidably sealed to the T-shaped grooves of the cylinder. The upper cavity of the cylinder has a vent hole and is connected to a one-way air intake valve and a one-way exhaust valve. The one-way exhaust valve is connected to a pressure valve at the bottom of the knee joint rotating plate via a hose. Airflow direction changing blocks are fixed on both sides of the knee joint rotating plate, and airflow guide holes are provided inside them. A second moving assembly, including an ankle sleeve, is installed above the knee joint rotating plate to fix the patient's foot.

[0007] Furthermore, the first moving component includes a first motor, which is fixed to the knee joint rotating plate. Its shaft is connected to a first screw, and a sliding block is threadedly connected to the outer circumference of the first screw. The sliding block is slidably connected to a first guide rod, and a first bracket is rotatably connected to both ends of the first guide rod and the first screw. The first bracket is fixedly connected to the knee joint rotating plate.

[0008] Furthermore, the hole-blocking assembly includes a hole-blocking block, a guide post is slidably connected inside the hole-blocking block, the guide post is fixedly connected to the knee joint rotating plate, a plurality of telescopic blocks are fixedly fixed on the top of the hole-blocking block, the telescopic blocks are fixedly connected to the knee joint rotating plate, and the telescopic blocks are covered with springs, with the two ends of the springs abutting against the hole-blocking block and the knee joint rotating plate respectively.

[0009] Furthermore, the hole-blocking block includes a hole-blocking horizontal plate, a sliding vertical plate connected to the bottom of one side of the hole-blocking horizontal plate, an inclined plate connected to the bottom of the sliding vertical plate, a guide hole provided at the top of the hole-blocking horizontal plate for sliding engagement with a guide post, and a sliding sealing connection between the sliding vertical plate and the clearance groove of the knee joint rotating plate.

[0010] Furthermore, the knee joint rotating plate includes a rotating shaft and a rotating plate body. The rotating plate body has multiple exhaust ports on both sides, an airflow chamber inside, clearance grooves on both sides of the bottom, multiple lower exhaust holes in the middle of the bottom, a connecting hole at one end, and mounting grooves on both sides of the top. The airflow chamber communicates with the exhaust ports, lower exhaust holes, and connecting holes. The pressure valve is sealed to the lower exhaust holes.

[0011] Furthermore, the second moving component also includes a second motor, which is fixed to the knee joint rotating plate. Its shaft is connected to a second screw, and the two ends of the second screw are rotatably connected to a second bracket. The second bracket is fixedly connected to the knee joint rotating plate, and a slider is threadedly connected to the outer circumference of the second screw. The slider is slidably connected to the mounting groove, and an ankle sleeve is fixedly connected above the slider.

[0012] Furthermore, the airflow direction changing block includes an airflow block, which has multiple arrays of airflow guide holes, and the airflow guide holes are connected to the exhaust port.

[0013] Furthermore, the vent hole of the upper cavity of the cylinder is sealed to the one-way intake valve, the one-way exhaust valve is sealed to the upper cavity of the cylinder, the pressure valve is sealed to the lower exhaust hole, and the hose connects the one-way exhaust valve and the pressure valve.

[0014] The technical effects and advantages of this invention are as follows: 0. The present invention, by providing an axial suspension component, facilitates the use of the elasticity of the coil spring to dynamically move the rotation axis during the patient's knee joint movement, adapting to the instantaneous changes in the knee joint's rotation center and avoiding secondary damage caused by a fixed axis.

[0015] 0. The present invention, by providing a first moving component, a blocking component, and an air blowing component, facilitates the adjustment of the sliding block position to change the training lever arm according to the patient's recovery level, and simultaneously adjusts the opening of the exhaust port, thereby achieving synchronous dynamic adjustment of training intensity and airflow comfort to meet the needs of different rehabilitation stages. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a half-sectional view of the overall structure of the present invention; Figure 4 This is a schematic diagram of the internal assembly structure of the knee joint rotating plate of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the first moving component and the knee joint rotating plate of the present invention; Figure 6 This is a schematic diagram of the internal structure of the knee joint rotating plate of the present invention; Figure 7 This is a schematic diagram of the internal structure of the air blowing assembly of the present invention; Figure 8 This is a schematic diagram of the hole-blocking block structure of the present invention.

[0017] The attached figures are labeled as follows: 1. Support component; 101. Support base plate; 102. Support column; 103. Seat plate; 104. Handrail; 2. Air blowing assembly; 201. Piston rod; 202. Cylinder; 203. Vent hole; 204. Lower lifting ring; 205. Upper lifting ring; 206. T-block; 207. T-slot; 3. First moving assembly; 301. First motor; 302. First screw; 303. First bracket; 304. Sliding block; 305. First guide rod; 4. Knee joint rotating plate; 401. Rotating shaft; 402. Rotating plate body; 403. Exhaust port; 404. Airflow cavity; 405. Clearance groove; 406. Mounting groove; 407. Lower exhaust. 408. Connecting hole; 5. Second moving component; 501. Second motor; 502. Second bracket; 503. Second screw; 504. Slider; 505. Ankle sleeve; 6. Shaft suspension component; 601. Third motor; 602. Rotating ring; 603. Coil spring; 7. Hole blocking component; 701. Hole blocking block; 7011. Hole blocking horizontal plate; 7012. Sliding vertical plate; 7013. Inclined plate; 7014. Guide hole; 702. Guide column; 703. Telescopic block; 704. Spring; 8. Airflow direction changing block; 801. Airflow block; 802. Airflow guide hole; 9. Pressure valve; 10. Hose; 11. One-way exhaust valve; 12. One-way intake valve. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The knee joint rehabilitation device involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 The present invention provides a knee joint rehabilitation device, including a support component 1, the support component 1 including a support base plate 101, a seat plate 103 installed on the top of the support base plate 101, an axial suspension assembly 6 rotatably connected to the inner side of the seat plate 103, a knee joint rotating plate 4 movably connected to the outer side of the axial suspension assembly 6, a first moving assembly 3 installed at the bottom of the knee joint rotating plate 4, and a blocking hole assembly 7 slidably installed inside the knee joint rotating plate 4. The first moving component 3 includes a first motor 301. The housing of the first motor 301 is fixedly connected to the knee joint rotating plate 4. The shaft of the first motor 301 is fixedly connected to a first screw 302. A sliding block 304 is helically connected to the outer periphery of the first screw 302. A first guide rod 305 is slidably connected to one side of the sliding block 304. A first bracket 303 is rotatably connected to both ends of the first guide rod 305 and the first screw 302. The bottom of the first bracket 303 is fixedly connected to the knee joint rotating plate 4. The hole-blocking assembly 7 includes a hole-blocking block 701, a guide post 702 is slidably connected inside the hole-blocking block 701, the guide post 702 is fixedly connected to the inside of the knee joint rotating plate 4, a plurality of arrayed telescopic blocks 703 are fixedly connected to the top of the hole-blocking block 701, the top of the telescopic blocks 703 is fixedly connected to the inside of the knee joint rotating plate 4, and a spring 704 is sleeved on the outside of the telescopic blocks 703, with both ends of the spring 704 being fixedly connected to the inside of the hole-blocking block 701 and the knee joint rotating plate 4, respectively. In this embodiment, it should be specifically noted that the power of the first motor 301 is stably provided by an external power source.

[0020] The main difference between this embodiment and the prior art is that this embodiment utilizes the fluidity of gas and the initiative of the first motor 301 to achieve different torques and airflow intensities during rehabilitation training due to different levels of patient rehabilitation, making the blowing more comfortable for the patient. The elasticity of the coil spring 603 itself allows the position of the rotating shaft 401 of the knee joint rotating plate 4 to move during use, specifically in the first moving component 3 and the blocking hole component 7. The above structure is the main structure of this embodiment, which solves the problem of mismatch between the existing fixed axis and the physiological movement of the knee joint. The first motor 301 is an existing structure. The specific structure and connection method of the first motor 301 will not be described in detail in this embodiment.

[0021] Reference Figures 1-3 A support column 102 is fixedly connected to the top of the support base plate 101. The top of the support column 102 is fixedly connected to the seat plate 103. The top two sides of the seat plate 103 are fixedly connected to the support plate 104. The bottom of the knee joint rotating plate 4 is movably connected to the air blowing assembly 2. The second moving assembly 5 is symmetrically distributed above the knee joint rotating plate 4. The airflow direction changing block 8 is fixedly connected to both sides of the knee joint rotating plate 4. The bottom of the knee joint rotating plate 4 is fixedly connected to the air blowing assembly 2 through the hose 10. The one-way exhaust valve 11 is fixedly connected to the upper cavity of the air blowing assembly 2. The other part of the upper cavity of the air blowing assembly 2 is fixedly connected to the one-way air intake valve 12.

[0022] In this embodiment, it should be specifically noted that the pressure valve 9, the one-way exhaust valve 11, and the one-way intake valve 12 are all connected in a sealed manner.

[0023] Reference Figure 1 and Figure 7 The air blowing assembly 2 includes a cylinder 202, a piston rod 201 is slidably connected to the inner side of the cylinder 202, the bottom of the cylinder 202 is fixedly connected to the support base plate 101, the upper cavity of the cylinder 202 is provided with a vent hole 203, the vent hole 203 is fixedly and sealedly connected to a one-way air intake valve 12, the top of the piston rod 201 is fixedly connected with a lower hanging ring 204, the outer side of the lower hanging ring 204 is sleeved with an upper hanging ring 205, the top of the upper hanging ring 205 is fixedly connected to the knee joint rotating plate 4, T-shaped blocks 206 are fixedly connected to both sides of the piston rod 201, and T-shaped grooves 207 are provided on both sides of the inner wall of the cylinder 202, and the T-shaped blocks 206 and the T-shaped grooves 207 are slidably and sealedly connected.

[0024] In this embodiment, it should be specifically explained that when the patient exerts force on the knee joint, the knee joint rotating plate 4 is rotated upward through the lower leg. The knee joint rotating plate 4 drives the upper hanging ring 205 to rotate. The upper hanging ring 205 drives the lower hanging ring 204 and the piston rod 201 to move upward along the T-groove 207. The piston head of the piston rod 201 compresses the air on it and enters the interior of the knee joint rotating plate 4 through the one-way exhaust valve 11 and the hose 10.

[0025] Reference Figures 4-6The knee joint rotating plate 4 includes a rotating shaft 401, a rotating plate body 402 fixedly connected to the outer side of the rotating shaft 401, multiple exhaust ports 403 symmetrically arranged on both sides of the rotating plate body 402, an airflow cavity 404 provided inside the rotating plate body 402, the airflow cavity 404 communicating with the exhaust ports 403, clearance grooves 405 provided on both sides of the bottom of the rotating plate body 402, the clearance grooves 405 communicating with the airflow cavity 404, multiple lower exhaust holes 407 provided in the middle of the bottom of the rotating plate body 402, the lower exhaust holes 407 being fixedly and sealedly connected to the pressure valve 9, a connecting hole 408 provided at the end of the rotating plate body 402 away from the rotating shaft 401, the connecting hole 408 communicating with the airflow cavity 404, and mounting grooves 406 symmetrically arranged on the outer side of the top wall of the rotating plate body 402.

[0026] In this embodiment, it should be specifically explained that: when the first motor 301 is started, the first motor 301 drives the first screw 302 to rotate, which moves the sliding block 304 to a position suitable for the patient's training. At this time, it is equivalent to changing the lever arm of the patient's knee joint driving the rotation of the knee joint rotating plate 4. The patient's knee joint must use more force to make the knee joint rotating plate 4 rotate to the training target position. When the sliding block 304 moves away from the rotation axis 401, the sliding block 304 presses the hole blocking assembly 7 to slide into the airflow cavity 404. The hole blocking block 701 compresses the spring 704 to contract. The sliding distance of the hole blocking assembly 7 covers part of each hole of the exhaust port 403. When it is necessary to move the sliding block 304 closer to the rotation axis 401, under the elastic action of the spring 704, the hole blocking block 701 moves away from each hole of the exhaust port 403, so that more of each hole in the exhaust port 403 is exposed.

[0027] Reference Figures 1-4 The second moving component 5 includes a second motor 501, the housing of which is fixedly connected to the rotating plate 402. A second screw 503 is fixedly connected to the shaft of the second motor 501. A second bracket 502 is rotatably connected to both sides of the second screw 503. The second bracket 502 is fixedly connected to the rotating plate 402. A slider 504 is helically connected to the outer periphery of the second screw 503. The slider 504 is slidably connected to the mounting groove 406. An ankle sleeve 505 is fixedly connected to the top of the slider 504.

[0028] In this embodiment, it should be specifically explained that: First, the rehabilitation patient sits on the seat board 103 and holds onto the armrest board 104. According to the length of the patient's legs, the second motor 501 is started, which drives the second screw 503 to rotate, causing the ankle sleeve 505 to move to a position suitable for the length of the patient's legs, and fixing the ankle inside the ankle sleeve 505.

[0029] Reference Figures 1-3The axial suspension assembly 6 includes a third motor 601. The housing of the third motor 601 is fixedly connected to the support base plate 101. A rotating ring 602 is fixedly connected to the rotating shaft of the third motor 601. A coil spring 603 is installed between the rotating ring 602 and the rotating shaft 401. The two ends of the coil spring 603 are fixedly connected to the inner side of the rotating ring 602 and the outer side of the rotating shaft 401, respectively.

[0030] In this embodiment, it should be specifically explained that: if the patient's knee joint has just begun to recover, the third motor 601 is started. The third motor 601 drives the coil spring 603 to retract inward. The elastic effect of the coil spring 603 provides a basic torque for the rotation of the knee joint rotating plate 4, making it easier for the patient's knee joint to drive the knee joint rotating plate 4 to complete the rotation action. Under the action of the coil spring 603, the knee joint rotating plate 4 remains suspended.

[0031] Reference Figure 4 and Figure 8 The hole-blocking block 701 includes a hole-blocking horizontal plate 7011, a sliding vertical plate 7012 fixedly connected to one side bottom of the hole-blocking horizontal plate 7011, an inclined plate 7013 fixedly connected to the bottom of the sliding vertical plate 7012, a guide hole 7014 penetrating through the top of the hole-blocking horizontal plate 7011, the sliding vertical plate 7012 and the relief groove 405 are slidably sealed together, and the guide hole 7014 is slidably connected to the guide post 702.

[0032] In this embodiment, it should be specifically explained that when the sliding block 304 moves away from the rotating shaft 401, the sliding block 304 presses the hole-blocking assembly 7 to slide into the airflow cavity 404, the hole-blocking block 701 compresses the spring 704 to contract, and the sliding vertical plate 7012 slides a distance that covers part of each hole of the exhaust port 403. When it is necessary to move the sliding block 304 closer to the rotating shaft 401, under the elastic action of the spring 704, the hole-blocking block 701 moves away from each hole of the exhaust port 403, so that more of each hole of the exhaust port 403 is exposed.

[0033] Reference Figure 3 and Figure 4 The airflow direction changing block 8 includes an airflow block 801. The airflow guide hole 802 has multiple arrays of airflow guide holes 802 inside. The position of the airflow guide hole 802 corresponds to the exhaust port 403 and is interconnected with the exhaust port 403.

[0034] In this embodiment, it should be specifically noted that the airflow guide hole 802 will discharge the gas rushing out of the exhaust port 403 towards the patient's knee area.

[0035] Working principle of the invention: The main problem solved by this embodiment is to utilize the fluidity of gas and the initiative of the first motor 301 to achieve different torques and airflow intensities during rehabilitation training due to different levels of patient rehabilitation, making the blowing more comfortable for the patient. Furthermore, by utilizing the elasticity of the coil spring 603, the position of the rotation axis 401 of the knee joint rotation plate 4 can be moved during use, thus solving the problem of mismatch between the existing fixed axis and the physiological movement of the knee joint.

[0036] The specific steps are as follows: First, the patient sits on the seat 103 and holds onto the armrest 104. Based on the patient's leg length, the second motor 501 is activated, causing the second screw 503 to rotate. This moves the ankle sleeve 505 to a position suitable for the patient's leg length, securing the ankle inside the ankle sleeve 505. If the patient's knee joint is just beginning to recover, the third motor 601 is activated. The third motor 601 drives the coil spring 603 to retract inward. The elasticity of the coil spring 603 provides a basic torque for the rotation of the knee joint rotating plate 4, making it easier for the patient's knee joint to rotate. If the patient's knee joint recovery is progressing well, the first motor 301 is activated. The first motor 301 drives the first screw 302 to rotate, which in turn drives the sliding block 304. Moving the device to a position suitable for patient training is equivalent to changing the lever arm of the patient's knee joint that drives the knee joint rotating plate 4 to rotate. The patient's knee joint must use more force to rotate the knee joint rotating plate 4 to the training target position. When the sliding block 304 moves away from the rotation axis 401, the sliding block 304 presses the hole blocking assembly 7 to slide into the airflow cavity 404. The hole blocking block 701 compresses the spring 704 to contract. The sliding vertical plate 7012 slides a distance that covers part of each hole of the exhaust port 403. When it is necessary to move the sliding block 304 closer to the rotation axis 401, the hole blocking block 701 moves away from each hole of the exhaust port 403 under the elastic action of the spring 704, so that each hole of the exhaust port 403 is exposed more. When the patient exerts force with their knee joint, the lower leg drives the knee joint rotating plate 4 to rotate upwards. The knee joint rotating plate 4 then drives the upper hanging ring 205 to rotate. The upper hanging ring 205 drives the lower hanging ring 204 and piston rod 201 to move upwards along the T-slot 207. The piston head of the piston rod 201 compresses the air above it, which enters the airflow chamber 404 through the one-way exhaust valve 11 and hose 10. The gas then exits through the exhaust port 403 and airflow guide hole 802, blowing onto the patient's entire leg, including the knee, making the patient more comfortable during movement. During this process, due to the body's... The instantaneous rotation center of the knee joint is dynamic. The change in the rotation center of the patient's knee joint causes the rotation axis 401 to move inside the coil spring 603, avoiding secondary damage to the patient's knee joint. If the patient's recovery is particularly good, the sliding vertical plate 7012 will block the exhaust port 403, leaving only a very small air delivery part. At this time, the internal airflow pressure greatly exceeds the set pressure of the lower exhaust port 407. At this time, the patient is still lifting the knee joint rotation plate 4 upward. The rushing air will generate an upward micro-support force on the patient, helping the patient to complete the leg lifting action and forming a closed loop. When the patient's knee joint contracts, the knee joint rotating plate 4 drives the upper hanging ring 205 to press down the lower hanging ring 204. External air enters the upper cavity of the cylinder 202 through the vent 203 and the one-way air intake valve 12. As the patient's knee joint rotates, the rotating shaft 401 also returns to its relative position with the coil spring 603.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A knee joint rehabilitation device, comprising a support component (1), characterized in that: The support component (1) includes a support base plate (101), a seat plate (103) is connected above the support base plate (101) via a support column (102), and a support plate (104) is provided on both sides of the seat plate (103). A shaft suspension assembly (6) is rotatably connected to the inner side of the seat plate (103). The shaft suspension assembly (6) includes a third motor (601), a rotating ring (602), and a coil spring (603). The third motor (601) drives the rotating ring (602), and the rotating ring (602) is connected to the rotating shaft (401) via the coil spring (603). A knee joint rotating plate (4) is movably connected to the outer side of the rotating shaft (401). A first moving assembly (3) is installed at the bottom of the knee joint rotating plate (4), and a baffle assembly (7) is slidably installed inside. An air blowing assembly (2) is also movably connected to the bottom of the knee joint rotating plate (4). The air blowing assembly (2) includes a cylinder. The cylinder body (202) and piston rod (201) are fixed to the support base plate (101). The piston rod (201) is connected to the knee joint rotating plate (4) through the lower hanging ring (204) and the upper hanging ring (205). The piston rod (201) has T-shaped blocks (206) on both sides that are slidably sealed to the T-shaped groove (207) of the cylinder body (202). The upper cavity of the cylinder body (202) has a vent hole (203) and is connected to a one-way air intake valve (12) and a one-way exhaust valve (11). The one-way exhaust valve (11) is connected to the pressure valve (9) at the bottom of the knee joint rotating plate (4) through a hose (10). Airflow direction changing blocks (8) are fixed on both sides of the knee joint rotating plate (4), and airflow guide holes (802) are provided inside. A second moving component (5) is installed above the knee joint rotating plate (4), including an ankle sleeve (505) to fix the patient's foot.

2. The knee joint rehabilitation device according to claim 1, characterized in that: The first moving component (3) includes a first motor (301), which is fixed to the knee joint rotating plate (4). Its shaft is connected to a first screw (302). A sliding block (304) is threadedly connected to the outer circumference of the first screw (302). A first guide rod (305) is slidably connected to the sliding block (304). A first bracket (303) is rotatably connected to both ends of the first guide rod (305) and the first screw (302). The first bracket (303) is fixedly connected to the knee joint rotating plate (4).

3. The knee joint rehabilitation device according to claim 1, characterized in that: The hole-blocking assembly (7) includes a hole-blocking block (701), a guide post (702) is slidably connected inside the hole-blocking block (701), the guide post (702) is fixedly connected to the knee joint rotating plate (4), a plurality of telescopic blocks (703) are fixedly fixed on the top of the hole-blocking block (701), the telescopic blocks (703) are fixedly connected to the knee joint rotating plate (4), and the telescopic blocks (703) are covered with springs (704), the two ends of the springs (704) respectively abut against the hole-blocking block (701) and the knee joint rotating plate (4).

4. The knee joint rehabilitation device according to claim 3, characterized in that: The hole-blocking block (701) includes a hole-blocking horizontal plate (7011), a sliding vertical plate (7012) is connected to the bottom of one side of the hole-blocking horizontal plate (7011), an inclined plate (7013) is connected to the bottom of the sliding vertical plate (7012), a guide hole (7014) is provided at the top of the hole-blocking horizontal plate (7011) and slides with the guide post (702), and the sliding vertical plate (7012) is slidably and sealingly connected with the clearance groove (405) of the knee joint rotating plate (4).

5. A knee joint rehabilitation device according to claim 1, characterized in that: The knee joint rotating plate (4) includes a rotating shaft (401) and a rotating plate body (402). The rotating plate body (402) has multiple exhaust ports (403) on both sides, an airflow chamber (404) inside the rotating plate body (402), clearance grooves (405) on both sides of the bottom of the rotating plate body (402), multiple lower exhaust holes (407) in the middle of the bottom of the rotating plate body (402), a connecting hole (408) at one end of the rotating plate body (402), and mounting grooves (406) on both sides of the top of the rotating plate body (402). The airflow chamber (404) is connected to the exhaust ports (403), the lower exhaust holes (407) and the connecting holes (408), and the pressure valve (9) is sealed to the lower exhaust holes (407).

6. A knee joint rehabilitation device according to claim 1, characterized in that: The second moving component (5) also includes a second motor (501), which is fixed to the knee joint rotating plate (4). Its shaft is connected to a second screw (503). The two ends of the second screw (503) are rotatably connected to a second bracket (502). The second bracket (502) is fixedly connected to the knee joint rotating plate (4). The outer circumference of the second screw (503) is threaded with a slider (504). The slider (504) is slidably connected to the mounting groove (406). An ankle sleeve (505) is fixedly connected above the slider (504).

7. The knee joint rehabilitation device according to claim 1, characterized in that: The airflow direction changing block (8) includes an airflow block (801), and the airflow block (801) is provided with a plurality of arrayed airflow guide holes (802), which are connected to the exhaust port (403).

8. A knee joint rehabilitation device according to claim 1, characterized in that: The vent hole (203) of the upper cavity of the cylinder (202) is sealed to the one-way intake valve (12), the one-way exhaust valve (11) is sealed to the upper cavity of the cylinder (202), the pressure valve (9) is sealed to the lower exhaust hole (407), and the hose (10) connects the one-way exhaust valve (11) and the pressure valve (9).

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