A limb surgery rehabilitation exercise device

Abstract

The application belongs to the technical field of physiotherapy rehabilitation devices, and relates to a limb operation rehabilitation exercise equipment. The equipment comprises a main machine, a first connecting frame which is slidably connected to the main machine, a second connecting frame which is rotatably connected to the main machine, and a pair of fixing members which are arranged on the first connecting frame and the second connecting frame. Each pair of the fixing members is provided with a mounting member, one side of the mounting member is detachably connected with a fixing belt, the fixing member is provided with a through groove for the fixing belt, and the fixing belt is detachably connected with a moving belt. The electric rotating shaft drives the moving belt to drive the fixing belt to move synchronously, so that the fixing belt is separated from the patient's leg during the straightening of the patient's leg, the patient's leg is naturally straightened under the action of gravity, the straightening degree of the leg is ensured, and the adhesion and tension of the joint capsule and ligament are more effectively released.

Description

Technical Field

[0001] This invention relates to the field of physiotherapy and rehabilitation devices, and more particularly to a limb surgery rehabilitation exercise device. Background Technology

[0002] The knee joint, as the largest and most complex weight-bearing joint in the human body, is prone to injury in sports injuries or osteoarthritis. For severe injuries, surgical treatment (such as ligament reconstruction, meniscus repair, or joint replacement) is often necessary. Postoperative rehabilitation is crucial for restoring joint range of motion, preventing adhesions, muscle atrophy, and deep vein thrombosis. Against this backdrop, continuous passive motion (CPM) training has become a common rehabilitation method after knee surgery. By simulating natural human movement, it passively, continuously, and slowly moves the patient's joint, helping to prevent joint adhesions and stiffness, promote articular cartilage repair, reduce postoperative pain and swelling, and accelerate lower limb blood circulation.

[0003] Commonly available CPM machines typically include an adjustable frame, a motor control system, and a limb support. To maintain synchronization between the legs and the machine during training, Velcro straps are generally used to secure the thighs and calves to the support. This method provides a relatively constant directional constraint throughout the entire movement cycle, but it also presents a challenge: during the flexion phase, the straps provide necessary upward support to assist the legs in flexion; however, during the extension phase, as the swing arm lowers, the legs should naturally straighten under gravity. At this point, the continuous upward constraint from the straps partially counteracts gravity, hindering the legs from fully extending downwards. This results in the knee joint being in a slightly flexed, suboptimal state at the end of extension, which, in the long run, increases the risk of knee flexion contracture. Summary of the Invention

[0004] In order to overcome the shortcomings of existing CPM machines during use, the present invention provides a limb surgery rehabilitation exercise device.

[0005] The technical solution is as follows: A limb surgery rehabilitation exercise device includes a main unit, a first connecting frame slidably connected to the main unit, a second connecting frame rotatably connected to the main unit, and the first and second connecting frames rotatably connected. Each of the first and second connecting frames is provided with a pair of fixing members, and each pair of fixing members is provided with an installation member. The installation member is located above the corresponding fixing member. A fixing belt is detachably connected to one side of the installation member. The fixing member is provided with a through groove for the corresponding fixing belt to pass through. A movable belt is detachably connected to the end of the fixing belt away from the corresponding installation member. The movable belt slides within the installation member and is provided with teeth. An electric rotating shaft is rotatably connected to the installation member, and a drive gear is fixedly connected to the electric rotating shaft. The drive gear meshes with the corresponding teeth. Each pair of fixing members is provided with a connecting component, which is used to change the relative position of the corresponding installation member.

[0006] Furthermore, the connecting assembly includes a rotating rod rotatably connected to one of the fixing members. The rotating rod is fixedly connected to a first connecting plate. A fixing shell is fixedly connected to the side of the first connecting plate away from the rotating rod. The fixing shell fits against the corresponding fixing member. A fixing screw is slidably and rotatably connected to the first connecting plate. The fixing screw is slidably and rotatably connected to the fixing shell. The fixing screw is threadedly connected to the corresponding fixing member. A first threaded rod is threadedly connected to the first connecting plate. The first threaded rod is rotatably connected to the corresponding mounting member. A first guide rod is fixedly connected to the mounting member. The first guide rod passes through the corresponding first connecting plate and is slidably connected to it.

[0007] Furthermore, each pair of fasteners is fixed to a fastening plate on the side closest to each other, and the fastening plate is located within the corresponding fastening band.

[0008] Furthermore, a guide shaft is rotatably connected within the through groove of the fastener, the guide shaft being located between the corresponding fixing belt and the corresponding fixing plate, and the guide shaft being in contact with the corresponding fixing belt.

[0009] Furthermore, it also includes two second connecting plates, which are symmetrically distributed. Both second connecting plates are rotatably connected to the first connecting frame. A second guide rod is slidably connected to one side of the second connecting plate. The second guide rod is fixedly connected to the limiting airbag. A second threaded rod is threadedly connected to the other side of the second connecting plate. The second threaded rod is rotatably connected to the corresponding limiting airbag.

[0010] Furthermore, the limiting airbags are made of an elastic deformable material, and both limiting airbags have recesses on their opposing sides.

[0011] Furthermore, the lower sides of the two symmetrically distributed second connecting plates are jointly fixed with a support airbag via a positioning plate.

[0012] Furthermore, the supporting airbag is arc-shaped, and the distance between the supporting airbag and the central axis of the limiting airbag decreases from both sides towards the middle.

[0013] Furthermore, both the first connecting frame and the second connecting frame are provided with Velcro straps on their upper sides, and pressure airbags are slidably connected to the Velcro straps.

[0014] Furthermore, the pressure airbag is located between the support airbag and the corresponding mounting component.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses an electric rotating shaft to drive the fixed belt to move synchronously, so as to separate the fixed belt from the patient's leg during the process of straightening the patient's leg, thereby allowing the patient's leg to straighten naturally under the action of gravity, ensuring the degree of leg straightening, and thus more effectively releasing the adhesion and tension of the joint capsule and ligaments.

[0016] The symmetrically distributed limiting airbags provide flexible support to the patient's knee during the bending and straightening of the leg, improving patient comfort, reducing pain, and thus enabling patients to better tolerate and adhere to rehabilitation training.

[0017] The inflated support airbag provides flexible support to the inner fossa of the patient's knee, creating a fulcrum below the knee joint to ensure that the patient's leg can be straightened smoothly. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the first connecting frame and fixing member of the present invention;

[0020] Figure 3 This is a three-dimensional structural cross-sectional view of the first connecting plate of the present invention;

[0021] Figure 4 This is a three-dimensional structural cross-sectional view of the fastener of the present invention;

[0022] Figure 5 This is a three-dimensional structural cross-sectional view of the mounting component of the present invention;

[0023] Figure 6 This is a three-dimensional structural cross-sectional view of the limiting airbag of the present invention.

[0024] In the above attached figures: 1: Main unit, 2: First connecting frame, 3: Second connecting frame, 4: Fixing component, 5: Mounting component, 6: Fixing belt, 7: Moving belt, 8: Toothed part, 9: Electric rotating shaft, 10: Drive gear, 11: Rotating rod, 12: First connecting plate, 13: Fixing shell, 14: Fixing screw, 15: First threaded rod, 16: First guide rod, 17: Fixing plate, 18: Guide shaft, 19: Second connecting plate, 20: Second guide rod, 21: Limiting airbag, 22: Second threaded rod, 23: Support airbag, 24: Velcro strap, 25: Pressure airbag. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] This embodiment provides a limb surgery rehabilitation exercise device, mainly for patients who have undergone knee surgery, aiming to solve the problem that the legs cannot be fully straightened during the use of existing rehabilitation exercise devices.

[0028] Please see Figures 1-5 The rehabilitation exercise equipment includes a main unit 1, a first connecting frame 2 slidably connected to the main unit 1, a second connecting frame 3 rotatably connected to the main unit 1, and the first connecting frame 2 and the second connecting frame 3 rotatably connected. Each of the first connecting frame 2 and the second connecting frame 3 is provided with a pair of fixing members 4. Each pair of fixing members 4 is provided with a mounting member 5. The mounting member 5 is located above the corresponding fixing member 4. A fixing strap 6 is detachably connected to one side of the mounting member 5. The fixing member 4 is provided with a through groove for the corresponding fixing strap 6 to pass through. A movable strap 7 is detachably connected to the end of the fixing strap 6 away from the corresponding mounting member 5. The movable strap 7 slides within the mounting member 5. The movable strap 7 is provided with a toothed part 8. An electric rotating shaft 9 is rotatably connected to the mounting member 5. A drive gear 10 is fixedly connected to the electric rotating shaft 9. The drive gear 10 meshes with the corresponding toothed part 8. Each pair of fixing members 4 is provided with a connecting component, which is used to change the relative position of the corresponding mounting member 5.

[0029] In the above scheme, the host 1 is equipped with an external bracket and a control terminal, and the host 1 is equipped with a drive module for moving the first connecting frame 2. The existing device diagram is not shown. The left side of the first connecting frame 2 is equipped with a fixing module for fixing the patient's ankle. Each pair of fixing parts 4 are two symmetrically distributed front and back. The projection of the mounting part 5 on the horizontal plane is located between the projections of the corresponding pair of fixing parts 4 on the horizontal plane. The front side of the mounting part 5 can be fixed to the fixing belt 6 by a pin, and the lower side of the mounting part 5 is provided with an arc-shaped surface so that the mounting part 5 contacts the upper side of the patient's leg during normal use. The fixing belt 6 is an existing device. The fixing belt 6 and the moving belt 7 can also be fixed by a pin, and the moving belt 7 is not retractable. The toothed part 8 is located in the middle of the moving belt 7. The electric rotating shaft 9 is electrically connected to the control terminal on the host 1.

[0030] Please see Figures 2-4 The connecting assembly includes a rotating rod 11, which is rotatably connected to one of the fixing parts 4. A first connecting plate 12 is fixedly connected to the rotating rod 11. A fixing shell 13 is fixedly connected to the side of the first connecting plate 12 away from the rotating rod 11. The fixing shell 13 fits against the corresponding fixing part 4. A fixing screw 14 is slidably and rotatably connected to the first connecting plate 12. The fixing screw 14 is slidably and rotatably connected to the fixing shell 13. The fixing screw 14 is threadedly connected to the corresponding fixing part 4. A first threaded rod 15 is threadedly connected to the first connecting plate 12. The first threaded rod 15 is rotatably connected to the corresponding mounting part 5. A first guide rod 16 is fixedly connected to the mounting part 5. The first guide rod 16 passes through the corresponding first connecting plate 12 and is slidably connected to it.

[0031] In the above scheme, the rotating rod 11 is rotatably connected to the upper side of the rear fixing member 4, and the first connecting plate 12 is located on the upper side of the corresponding rotating rod 11; the fixing shell 13 is located on the front side of the corresponding first connecting plate 12; the fixing screw 14 is threadedly connected to the corresponding front fixing member 4 to fix the first connecting plate 12 to the corresponding fixing member 4; the first threaded rod 15 is located in the middle of the corresponding first connecting plate 12, and the vertical position of the corresponding mounting member 5 can be changed by rotating the first threaded rod 15.

[0032] Please see Figure 4 Each pair of fasteners 4 has a fastening plate 17 fixed to one side of each other, and the fastening plate 17 is located within the corresponding fastening band 6.

[0033] In the above scheme, the two fixing plates 17 corresponding to each pair of fixing members 4 are used to support the left and right sides of the patient's legs, and the opposing sides of the two fixing plates 17 are provided with arc-shaped surfaces to increase the contact area between the fixing plates 17 and the patient's legs.

[0034] Please see Figure 4A guide shaft 18 is rotatably connected in the through groove of the fastener 4. The guide shaft 18 is located between the corresponding fixing belt 6 and the corresponding fixing plate 17, and the guide shaft 18 is in contact with the corresponding fixing belt 6 to reduce the friction force on the fixing belt 6 during movement.

[0035] The specific workflow of the above scheme is as follows:

[0036] When this device is needed to perform flexion and extension rehabilitation exercises for patients who have undergone knee surgery, medical staff move the device to the designated position and then adjust the positions of the two first connecting plates 12 in sequence. The following description uses the adjustment process of the left first connecting plate 12 as an example:

[0037] Rotate the fixing screw 14 so that it moves upward along the through hole on the fixing shell 13 and the first connecting plate 12 during rotation. After the fixing screw 14 separates from the corresponding fixing part 4, stop rotating the fixing screw 14. Then disconnect the connection between the fixing band 6 and the moving band 7 and remove the fixing band 6 from the through groove of the corresponding fixing part 4. After removing it, rotate the rotating rod 11. The rotating rod 11 drives the first connecting plate 12 and all its parts to rotate synchronously. After the rotating rod 11 rotates 90°, the medical staff will stop rotating the rotating rod 11 and change the position of the right first connecting plate 12 according to the above operation.

[0038] After adjusting the positions of the two first connecting plates 12 on the left and right to the appropriate positions, the medical staff use the fixing module to fix the patient's ankle to the first connecting frame 2, and then rotate the two rotating rods 11 in opposite directions in sequence. Taking the rotation process of the left rotating rod 11 as an example:

[0039] When the rotating rod 11 rotates 90° in the opposite direction, the fixing screw 14 rotates in the opposite direction. During the rotation, the fixing screw 14 moves downward along the through hole on the fixing shell 13 and the first connecting plate 12, so that the fixing screw 14 and the corresponding fixing part 4 are re-threaded, thereby fixing the first connecting plate 12 and the corresponding fixing part 4. After the first connecting plate 12 is fixed, the medical staff will pass the fixing strap 6 through the through groove on the two fixing parts 4 in sequence, and fix the fixing strap 6 and the moving strap 7.

[0040] After securing the fixing belt 6 and the moving belt 7, the medical staff rotates the first threaded rod 15. During the rotation, the first threaded rod 15 drives the mounting part 5 and all its parts to move up and down synchronously, thereby adjusting the vertical position of the mounting part 5. When the lower side of the mounting part 5 moves downward to contact the patient's leg (during this process, the medical staff can place a flexible pad on the lower side of the mounting part 5 to reduce the direct pressure between the mounting part 5 and the patient's leg), the medical staff stops rotating the first threaded rod 15, thus fixing the mounting part 5 in that position. Subsequently, the control terminal controls the electric rotating shaft 9 to rotate, which drives the drive gear 10 to rotate. During the rotation, the drive gear 10 drives the moving belt 7 to move forward through meshing with the toothed part 8, thereby driving the fixing belt 6 to move synchronously (tightening the fixing belt 6). When the fixing belt 6 moves to fit tightly against the lower side of the patient's leg, the control terminal stops the electric rotating shaft 9. The adjustment process of the right fixing belt 6 is the same as the adjustment process of the left fixing belt 6 described above.

[0041] After shutting down the two electric rotating shafts 9, the control terminal starts the drive module, which drives the first connecting frame 2 to move to the right, allowing the patient's leg to bend (the bending angle can be set by the control terminal by setting the distance the first connecting frame 2 moves). During the bending process, the two fixing straps 6 provide support for the patient's leg, thereby ensuring the stability of the patient's leg and ensuring that the patient's leg can bend normally along the predetermined trajectory. At the same time, during the bending process, the two fixing plates 17 on the rear side support the back of the patient's thigh and calf respectively, and the two fixing plates 17 on the front side support the front of the patient's thigh and calf respectively, thereby limiting the left and right swaying and rotation of the patient's leg, increasing the stability of the patient's leg, and ensuring the smooth progress of the exercise process.

[0042] Once the first connecting frame 2 has moved to its limit position (this position is specifically set by medical staff based on the patient's leg recovery level), the control terminal controls the drive module to move the first connecting frame 2 to the left, thereby allowing the patient's leg to straighten. During the straightening process, the control terminal controls the two electric rotating shafts 9 to move the moving belt 7 backward, causing the fixing belt 6 to separate from the patient's leg (the specific process is the same as the tightening process described above, and will not be described in detail again). The fixing belt 6 no longer provides support to the patient's leg, and after the first connecting frame 2 moves to its limit position to the left, the patient's leg naturally straightens under the action of gravity. Then, the control terminal shuts off the drive module. After a specified time (the length of this time is set by the staff), the control terminal controls the two electric rotating shafts 9 to rotate, thereby tightening the two fixing belts 6, and repeating the above bending-straightening action to continue the bending and straightening exercise for the patient.

[0043] After the designated exercise time (which is set by medical staff based on the patient's recovery progress), the medical staff will separate the device from the patient and disinfect and maintain the device for future use.

[0044] Example 2

[0045] Based on Example 1, this embodiment further optimizes a limb surgery rehabilitation exercise device, aiming to enhance the support for the patient's legs during exercise.

[0046] Please see Figure 2 , Figure 3 and Figure 6 It also includes two second connecting plates 19, which are symmetrically distributed. Both second connecting plates 19 are rotatably connected to the first connecting frame 2. A second guide rod 20 is slidably connected to one side of the second connecting plate 19. The second guide rod 20 is fixedly connected to the limiting airbag 21. A second threaded rod 22 is threadedly connected to the other side of the second connecting plate 19. The second threaded rod 22 is rotatably connected to the corresponding limiting airbag 21.

[0047] In the above scheme, the central axis of the second connecting plate 19 coincides with the central axis of the connection between the first connecting frame 2 and the second connecting frame 3; the second guide rod 20 is located on the lower side of the corresponding second connecting plate 19; the central axis of the limiting airbag 21 coincides with the central axis of the connection between the first connecting frame 2 and the second connecting frame 3, and the limiting airbag 21 is located on the inner side of the first connecting frame 2. The limiting airbag 21 is used to support both sides of the patient's knee; the second threaded rod 22 is located on the upper side of the second connecting plate 19. The position of the corresponding limiting airbag 21 can be changed by rotating the second threaded rod 22. A rigid rotating ring can be set at the connection position between the limiting airbag 21 and the second threaded rod 22 to maintain the normal connection between the two; the main unit 1 is provided with an air supply module for introducing gas into the two limiting airbags 21. The air supply module is an existing device and is not shown in the figure.

[0048] Please see Figure 3 The limiting airbag 21 is made of an elastic and deformable material, and both limiting airbags 21 have recessed parts on their opposite sides, so that the limiting airbags 21 still have recessed parts after inflation, thereby providing wrapping support for the patient's knee.

[0049] Please see Figure 3 The two symmetrically distributed second connecting plates 19 are fixedly connected to the lower side of the support airbag 23 through the positioning plate. The support airbag 23 is used to support the inner fossa of the patient's knee, and the support airbag 23 is connected to the air supply module on the main unit 1.

[0050] Please see Figure 3The support airbag 23 is arc-shaped, and the distance between the support airbag 23 and the central axis of the limiting airbag 21 decreases from both sides to the middle.

[0051] In the above scheme, the shape of the support airbag 23 is defined so that the support airbag 23 can expand upward.

[0052] The specific workflow of the above scheme is as follows:

[0053] After securing the patient's leg to the first connecting frame 2 and tightening the two securing straps 6, the medical staff adjusts the position of the two limiting airbags 21 according to the thickness of the patient's knee. The specific procedure is as follows:

[0054] Rotating the two second threaded rods 22 causes them to drive the corresponding limiting airbags 21 to move, bringing the two limiting airbags 21 closer together (during this process, the limiting airbags 21 drive the corresponding second guide rods 20 to move synchronously). When the two limiting airbags 21 move to a position close to the patient's legs but not yet in contact with them, the medical staff stops rotating the two second threaded rods 22. Subsequently, the control terminal controls the air supply module to fill the two limiting airbags 21 with gas, causing the two limiting airbags 21 to inflate. After the airbags 1 are in contact with the patient's legs, the staff turns off the air supply module and then performs bending exercises as described above. During the bending process, the two limiting airbags 21 provide wrapping and flexible support to the front and back sides of the patient's knee, reducing the probability of unnecessary inversion, valgus or lateral swaying during exercise, protecting the surgically repaired ligaments, tendons and other structures from abnormal stress, improving patient comfort, reducing pain and fear, thus enabling patients to better tolerate and persist with rehabilitation training, and optimizing the accuracy and effectiveness of rehabilitation training.

[0055] After completing the bending exercise, the patient performs the straightening exercise as described above. During the exercise, the air supply module delivers gas to the support airbag 23, causing the support airbag 23 to inflate. The inflated support airbag 23 provides flexible support to the inner fossa of the patient's knee, establishing a fulcrum below the patient's knee joint to ensure that the patient's leg can be straightened smoothly.

[0056] Once the patient's leg is straightened, the control terminal separates the two fixing straps 6 from the patient's leg as described above. At the same time, the control terminal controls the air supply module to extract the gas from the support airbag 23, causing the support airbag 23 to lose contact with the inner crease of the patient's knee, thereby removing the support for the patient's leg and ensuring that the patient's leg can naturally straighten under the action of gravity. After a specified time, the above operation is repeated to continue the bending and straightening exercise.

[0057] Example 3

[0058] Based on Example 2, please refer to Figure 3 The upper sides of the first connecting frame 2 and the second connecting frame 3 are both provided with a magic belt 24. A pressure airbag 25 is slidably connected to the magic belt 24. The pressure airbag 25 is located between the support airbag 23 and the corresponding mounting piece 5, so that the two pressure airbags 25 can contact the part of the patient's lower leg near the knee and the part of the patient's thigh near the knee respectively, so as to apply a straightening force to the patient's leg.

[0059] In the above scheme, the pressure airbags 25 are located above the patient's legs, with the two pressure airbags 25 corresponding to the lower leg near the knee and the thigh near the knee, respectively. After fixing the patient's legs to the first connecting frame 2, the medical staff tightens the two Velcro straps 24 in sequence, thereby fixing the pressure airbags 25 in contact with the patient's legs (only contact, no compression). Then, the patient's legs are flexed and straightened as described above. After the patient's legs are straightened, the air supply module is controlled to deliver gas into the two pressure airbags 25, causing the two pressure airbags 25 to inflate and compress the patient's legs (the inflation volume of the pressure airbags 25 is set by the medical staff according to the patient's recovery status). This provides a low-load and downward pressure to the patient's legs, thereby applying a continuous and gentle stretching force to the ligaments, tendons, and other tissues in the patient's knee joint area, thereby inducing plastic lengthening of the contracted tissues behind the knee joint, consolidating and strengthening the results of full straightening, and laying the foundation for functional recovery. After the specified time of straightening, the control terminal extracts the gas from the two pressure bladders 25 and repeats the above operation to continue the flexion and extension exercises for the patient.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A limb surgery rehabilitation exercise device, comprising a main unit (1), a first connecting frame (2) slidably connected to the main unit (1), and a second connecting frame (3) rotatably connected to the main unit (1), wherein the first connecting frame (2) and the second connecting frame (3) are rotatably connected, characterized in that: Both the first connecting frame (2) and the second connecting frame (3) are provided with a pair of fixing members (4). Each pair of fixing members (4) is provided with a mounting member (5). The mounting member (5) is located above the corresponding fixing member (4). A fixing strap (6) is detachably connected to one side of the mounting member (5). A through groove is provided on the fixing member (4) for the corresponding fixing strap (6) to pass through. A movable strap (7) is detachably connected to the end of the fixing strap (6) away from the corresponding mounting member (5). The movable strap (7) slides in the mounting member (5). The movable strap (7) is provided with a toothed part (8). The mounting member (5) is rotatably connected to an electric rotating shaft (9). A drive gear (10) is fixedly connected to the electric rotating shaft (9). The drive gear (10) meshes with the corresponding toothed part (8). Each pair of fixing members (4) is provided with a connecting component. The connecting component is used to change the position of the corresponding mounting member (5). The control terminal controls the drive module to move the first connecting frame (2) to the left, thereby allowing the patient's leg to straighten. During the straightening process, the control terminal controls the two electric rotating shafts (9) to move the moving belt (7) backward, causing the fixing belt (6) to separate from the patient's leg. The fixing belt (6) no longer provides support to the patient's leg. After the first connecting frame (2) moves to the left to its limit position, the patient's leg naturally straightens under the action of gravity.

2. The limb surgery rehabilitation exercise device according to claim 1, characterized in that: The connecting assembly includes a rotating rod (11), which is rotatably connected to one of the fixing members (4). The rotating rod (11) is fixedly connected to a first connecting plate (12). A fixing shell (13) is fixedly connected to the side of the first connecting plate (12) away from the rotating rod (11). The fixing shell (13) fits against the corresponding fixing member (4). The first connecting plate (12) is slidably and rotatably connected to a fixing screw (14). The fixing screw (14) is slidably and rotatably connected to the fixing shell (13). The fixing screw (14) is threadedly connected to the corresponding fixing member (4). The first connecting plate (12) is threadedly connected to a first threaded rod (15). The first threaded rod (15) is rotatably connected to the corresponding mounting member (5). The mounting member (5) is fixedly connected to a first guide rod (16). The first guide rod (16) passes through the corresponding first connecting plate (12) and is slidably connected to it.

3. The limb surgery rehabilitation exercise device according to claim 1, characterized in that: Each pair of fasteners (4) is fixed with a fixing plate (17) on the side that is close to each other, and the fixing plate (17) is located inside the corresponding fixing band (6).

4. A limb surgery rehabilitation exercise device according to claim 3, characterized in that: The guide shaft (18) is rotatably connected in the through groove of the fastener (4). The guide shaft (18) is located between the corresponding fixing belt (6) and the corresponding fixing plate (17), and the guide shaft (18) is in contact with the corresponding fixing belt (6).

5. A limb surgery rehabilitation exercise device according to claim 1, characterized in that: It also includes two second connecting plates (19) that are symmetrically distributed. Both second connecting plates (19) are rotatably connected to the first connecting frame (2). A second guide rod (20) is slidably connected to one side of the second connecting plate (19). The second guide rod (20) is fixedly connected to the limiting airbag (21). A second threaded rod (22) is threadedly connected to the other side of the second connecting plate (19). The second threaded rod (22) is rotatably connected to the corresponding limiting airbag (21).

6. A limb surgery rehabilitation exercise device according to claim 5, characterized in that: The limiting airbag (21) is made of an elastic deformable material, and the two limiting airbags (21) are provided with recesses on opposite sides.

7. A limb surgery rehabilitation exercise device according to claim 5, characterized in that: The two symmetrically distributed second connecting plates (19) have a support airbag (23) fixedly connected to their lower sides by a positioning plate. When the patient's leg is straightened, the control terminal controls the air supply module to extract the gas from the support airbag (23), so that the support airbag (23) loses contact with the inner crease of the patient's knee, thereby removing the support for the patient's leg and ensuring that the patient's leg can be straightened naturally under the action of gravity.

8. A limb surgery rehabilitation exercise device according to claim 7, characterized in that: The support airbag (23) is arc-shaped, and the distance between the support airbag (23) and the central axis of the limiting airbag (21) decreases from both sides to the middle.

9. A limb surgery rehabilitation exercise device according to claim 7, characterized in that: Both the first connecting frame (2) and the second connecting frame (3) are provided with a magic belt (24) on their upper sides. A pressure airbag (25) is slidably connected to the magic belt (24). When the patient's legs are straightened, the pressure airbag (25) inflates and squeezes the patient's legs.

10. A limb surgery rehabilitation exercise device according to claim 9, characterized in that: The pressure airbag (25) is located between the support airbag (23) and the corresponding mounting component (5).

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