Postoperative knee joint exercise device

Abstract

This application discloses a post-knee joint exercise device, including a base component, an adjustment component, and a support component. The base component includes a base plate with several positioning ribs on its top. The adjustment component is located on the top of the base plate, in front of and behind the positioning ribs. The adjustment component includes a fixed seat arranged laterally along the base plate. A guide rod is provided on the top of the fixed seat, and a slider is slidably mounted on the guide rod. The slider slides along the length of the guide rod, and a pulley is provided on the top of the slider. The support component includes a folding plate, comprising a first plate body and a second plate body. The first plate body is located to the right of the second plate body, and its right end is swayably connected to the right side of the top surface of the base plate. A rotating rod is provided on the left end face of the first plate body, and a traction rope is provided on the front side of the rotating rod. The other end of the traction rope passes sequentially through the front pulley and the rear pulley, and is connected to the rear side of the rotating rod. This device can reduce shear forces during rehabilitation exercises.

Description

Technical Field

[0001] This application relates to the field of knee joint rehabilitation technology, and in particular to a postoperative exercise device for knee joint. Background Technology

[0002] Patients with knee injuries are common in orthopedic wards, and these patients often require prolonged bed rest due to their injuries. After recovery, they usually need to use knee rehabilitation aids to promote functional recovery. However, existing equipment often struggles to effectively and specifically target the knee joint, resulting in poor training outcomes. Furthermore, during rehabilitation, patients typically lack adequate resistance at appropriate angles in their legs, further reducing the effectiveness of rehabilitation training.

[0003] In the prior art, an orthopedic knee joint rehabilitation assistive device (application publication number CN122005272A) is disclosed. The device has a crossbar installed at the bottom of its seat frame, and a rehabilitation training mechanism is mounted on the crossbar. By setting up a passive telescopic cylinder and an active telescopic cylinder, a telescopic screw can drive the passive telescopic cylinder to extend and retract within the active telescopic cylinder, causing a lower leg support connected to the passive telescopic cylinder to move passively. The patient moves their lower leg, causing the lower leg support and the active telescopic cylinder to move. The movement of the active telescopic cylinder drives one-way valve one and one-way valve two, enabling the patient to perform active movement. However, the rear end of the rehabilitation exercise component is hinged to the rear end of the position switching component. At the same time, a movable support is provided above the rehabilitation exercise component. Although the rehabilitation exercise component can swing at a certain angle together with the lower leg support, the swing angle of the rehabilitation exercise component is limited because the position of the rear end of the rehabilitation exercise component is fixed and it is blocked by the movable support above it. It may not be able to complete a full range of leg flexion and extension. Secondly, because the inclination or angle between the rehabilitation exercise component and the lower leg support is large, shearing force may be generated, which is not conducive to rehabilitation training. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a postoperative exercise device for knee joint that can reduce shear force during rehabilitation exercises.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] Postoperative knee joint exercise device, including base component, adjustment component and support component;

[0007] The base component includes a base plate, and the top of the base plate is provided with a plurality of positioning ribs. The positioning ribs are arranged along the longitudinal direction of the base plate, and the positioning ribs are distributed at equal intervals.

[0008] The adjusting component is located on the top of the base plate and on the front and rear sides of the positioning rib. The adjusting component includes a fixed seat, which is arranged laterally along the base plate. A guide rod is provided on the top of the fixed seat, and a slider is slidably provided on the guide rod. The slider slides along the length of the guide rod, and a pulley is provided on the top of the slider.

[0009] The supporting component includes a folding plate, which includes a first plate and a second plate. The first plate is located to the right of the second plate. The right end of the first plate is swayably connected to the right side of the top surface of the base plate. A rotating rod is provided on the left end face of the first plate. A traction rope is provided on the front side of the rotating rod. The other end of the traction rope passes through the front pulley and the rear pulley in sequence and is connected to the rear side of the rotating rod.

[0010] In some embodiments, a limiting assembly is provided on the left side of the top surface of the base plate. The limiting assembly includes two first swing rods, which are respectively disposed on the front and rear sides of the top of the base plate. A second swing rod is adjustablely connected to the top of each of the first swing rods. A connecting rod is connected to the free ends of the two second swing rods. A limiting plate is provided at the top of the two second swing rods and the connecting rod. This addresses the technical problem of how to control the range of leg flexion and extension.

[0011] To fix the guide rod to the mounting base, in some embodiments, the top of the mounting base is provided with a placement groove, and the guide rod is placed in the placement groove.

[0012] To temporarily lock the position of the slider, in some embodiments, the rear end of the fixing seat located on the rear side of the top surface of the base plate is provided with a first stroke groove along the lateral direction; the rear end of the slider in the fixing seat is provided with a threaded through hole, and a limiting bolt is provided in the threaded through hole, the rear end of the limiting bolt protruding from the first stroke groove.

[0013] To achieve the position adjustment slider that follows the range of leg flexion and extension, in some embodiments, the outer wall of the guide rod in the fixed seat located on the front side of the top of the base plate is threaded, and the guide rod is rotatably disposed in the placement groove; the bottom of the slider in the fixed seat is provided with a semi-circular threaded groove, and the threaded groove and the thread engage with each other.

[0014] To prevent the slider from coming off, the above solution is further extended by providing an elastic locking component inside the fixed seat located on the front side of the top of the base plate. The elastic locking component includes a locking end. The side wall inside the fixed seat is provided with a locking groove, and the locking end can be movably locked into the locking groove.

[0015] To enable the two sliders to move together, in some embodiments, a cavity is provided at the bottom of the base, and a linkage rod is provided in the cavity to connect the slider on the front side of the base plate with the slider on the rear side.

[0016] Compared to existing technologies, this application achieves at least the following beneficial effects: The device places a traction rope around the patient's foot requiring rehabilitation. By adjusting the traction rope, resistance is increased during leg flexion and extension movements, thereby improving the effectiveness of rehabilitation training. Simultaneously, the slide is adjustable. When the patient performs leg flexion and extension at different angles, the position of the slider on the guide rod can be adjusted to maintain the traction rope as perpendicular to the foot as possible, reducing the shearing force exerted by the traction rope on the foot and thus enhancing the effectiveness of rehabilitation training. Attached Figure Description

[0017] One or more embodiments of this application will now be described by way of example only with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a perspective view of a knee joint postoperative exercise device according to one embodiment of this application;

[0019] Figure 2 for Figure 1 A perspective view of the exercise device in the embodiment;

[0020] Figure 3 for Figure 1 Side sectional view of the exercise device in the embodiment;

[0021] Figure 4 This is a perspective view of an exercise device according to another embodiment of this application;

[0022] Figure 5 for Figure 4 Side sectional view of the exercise device in the embodiment;

[0023] Figure 6 for Figure 5 A partial schematic diagram at point A in the embodiment;

[0024] Figure 7 for Figure 4 A three-dimensional schematic diagram of the linkage mechanism in the exercise device of the embodiment;

[0025] Figure 8 for Figure 7 A three-dimensional schematic diagram of the linkage mechanism in the embodiment from another perspective.

[0026] The following are the labels in the diagram: 1. Rear fixed seat; 1-1. First stroke groove; 2. First swing rod; 3. Connecting block; 4. Second swing rod; 5. Connecting rod; 6. Traction rope; 7. Second plate; 8. Soft pad; 9. First plate; 10. Rotating rod; 11. Bearing seat; 12. Handwheel; 13. Front fixed seat; 14. Front slider; 15. Front pulley; 16. Base plate; 17. Limiting plate; 18. Positioning rib; 9. Rear slider; 20. Rear pulley; 21. Limit bolt; 22. Rear guide rod; 23. Front guide rod; 24. Linkage rod; 25. Transmission wheel; 26. Synchronous belt; 27. First bevel gear; 28. Rotating shaft; 29. ​​Second bevel gear; 30. Sliding plate; 31. Snap-fit ​​end; 32. Pressing end; 33. Spring; 34. Snap-fit ​​piece; 35. Tensioner wheel; 36. Synchronous pulley; 37. Fixed column; 38. Swing arm. Detailed Implementation

[0027] The present application will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0028] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0029] To address the drawback of existing technologies that involve significant shear forces during leg flexion and extension rehabilitation, the inventors, after careful analysis, discovered that the primary cause of this problem lies in the fact that during normal knee flexion and extension movements, the joint surfaces primarily bear compressive forces. In existing technologies, the rehabilitation exercise component is not perpendicular to the lower leg support because, when the lower leg is raised, the component is fixed and cannot follow the lower leg's movement trajectory to ensure a near-perpendicular angle. Therefore, the force on the joint changes from simple compressive force to a combined compressive and shear force. This situation can lead to cartilage wear and is detrimental to the recovery of joint function.

[0030] Based on the above analysis, the inventor designed a postoperative exercise device for the knee joint.

[0031] like Figure 1-3As shown, in at least one embodiment of the postoperative knee joint exercise device of this application, a base component, an adjustment component, and a support component are included. The base component is used to stably place the entire device on the bed, the adjustment component is used to adjust the perpendicularity between the traction rope 6 and the lower leg when resistance is applied, and the support component is used to support the lower limb and adjust the range of leg flexion and extension.

[0032] The base component includes a rectangular base plate 16, which can be made of metal sheet or PP plastic sheet. The top of the base plate 16 is integrally formed or welded (depending on the material of the base plate 16) with several positioning ribs 18. The positioning ribs 18 are elongated strips with square front ends. These positioning ribs 18 are arranged along the width of the base plate 16 and are horizontally equidistant, specifically distributed from the right-center to the left-center position on the top surface of the base plate 16.

[0033] The adjusting component is installed on the top of the base plate 16. This adjusting component includes a rear fixed seat 1 and a front fixed seat 13. The rear fixed seat 1 is installed on the rear side of the positioning rib 18 and arranged along the length of the base plate 16. A round rod-shaped rear guide rod 22 is horizontally installed on the top of the rear fixed seat 1. A rectangular rear slider 19 is slidably installed on the rear guide rod 22. The side of the rear slider 19 has a through hole through which it is fitted onto the rear guide rod 22. The top surface of the rear slider 19 is higher than the top surface of the rear fixed seat 1. The rear slider 19 slides along the length of the rear guide rod 22. A rear pulley 20 is connected to the top of the rear slider 19. Specifically, the rear pulley 20 is a rust-proof color steel U-shaped pulley. The top surface of the pulley's fixing bracket is connected to the top surface of the rear slider 19 by screws or welding.

[0034] A front fixing seat 13 is installed on the front side of the positioning rib 18 and arranged along the length of the base plate 16. A round rod-shaped front guide rod 23 is horizontally installed on the top of the front fixing seat 13. A rectangular front slider 14 is slidably installed on the front guide rod 23. The front slider 14 has a through hole on its side and is fitted onto the front guide rod 23 through the through hole. The top surface of the front slider 14 is higher than the top surface of the front fixing seat 13. The front slider 14 slides along the length of the front guide rod 23. A front pulley 15 is connected to the top of the front slider 14. Specifically, the front pulley 15 is also a rust-proof color steel U-shaped pulley. The top surface of the pulley's fixing bracket is connected to the top surface of the front slider 14 by screws or welding.

[0035] The supporting components include a folding plate. Specifically, the folding plate comprises a first plate 9 and a second plate 7, both rectangular in shape and made of wood. The first plate 9 is located to the right of the second plate 7. Hinges are screwed onto the top of the two opposing end faces of the first plate 9. The right leaf of the hinge is connected to the left wall of the first plate 9, and the left leaf is connected to the right wall of the second plate 7, thereby hinged the tops of the first plate 9 and the second plate 7 to form a foldable shape. The right end of the first plate 9 is pivotally connected to the right side of the top surface of the base plate 16, also using a hinge. Specifically, the left leaf of the hinge is screwed onto the right side of the bottom of the first plate 9, and the right leaf is screwed onto the top surface of the base plate 16. Two bearing seats 11 (vertical KP series bearing seats 11 can be selected) are fixed to the left end face of the first plate 9 with screws. These two bearing seats 11 are equidistant from each other and coaxially distributed. A matching round rod-shaped rotating rod 10 is installed in the shaft hole of the two bearing seats 11. Handwheels 12 with a diameter of 7-10 cm are installed at the front and rear ends of the rotating rod 10 to drive the rotating rod 10 to rotate. A nylon traction rope 6 is tied to the front side of the rotating rod 10. The traction rope 6 is wound around the front end of the rotating rod 10 for a certain length. The other end of the traction rope 6 passes through the U-shaped groove of the front pulley 15 and the rear pulley 20 in sequence, and is then tied to the rear end of the rotating rod 10. The length of the traction rope 6 wound around the rear end of the rotating rod 10 is equal to the length wound around the front end of the rotating rod 10, so that the traction rope 6 can be wound and unwound at equal intervals.

[0036] In use, adjust the opening range of the folding plate so that the bottom of the second plate 7 is inserted into the gap between the two positioning ribs 18 below it, thus fixing the folding plate. Then, the back of the patient's thigh rests on the right side of the first plate 9, and the back of the lower leg rests on the left side of the second plate 7, with the popliteal fossa positioned above the hinge point between the first plate 9 and the second plate 7. Place the traction rope 6 between the front pulley 15 and the rear pulley 20 around the patient's foot. Adjust the positions of the front pulley 15 and the rear pulley 20 according to the current posture of the lower leg, so that the angle between the traction rope 6 and the lower leg is nearly perpendicular. Turn the handwheel 12 to rotate the rotating rod 10, tightening the traction rope 6, thus fixing the patient's lower leg to the second plate 7. When performing leg extension movements, control the rotation of the rotating rod 10 by manipulating the handwheel 12. Depending on the rehabilitation progress, apply appropriate resistance to the leg extension movement through the traction rope 6. Slowly release the traction rope 6 wrapped around the rotating rod 10 according to the extension range, and rehabilitation training can begin. When the leg extension is large and the angle between the traction rope 6 and the lower leg deviates significantly from the vertical position, this problem can be overcome by adjusting the positions of the front pulley 15 and the rear pulley 20.

[0037] To further improve the patient's comfort when placing their lower limbs on the folding board, a soft pad 8 can be glued or screwed to the connection between the first board 9 and the second board 7. The soft pad 8 can be made from a yoga mat, with a width equal to that of the first board 9, and its two ends terminate at the middle of the first board 9 and the middle of the second board 7, respectively. To further improve the comfort when the foot (or ankle joint) contacts the traction rope, a contact plate (not numbered in the attached figure) that can slide along the traction rope is fitted on the traction rope in the area between the front and rear pulleys, to increase the contact area between the traction rope 6 and the foot. Specifically, the contact plate is made of PP or acrylic sheet, and when viewed from the side, it has an arc-shaped structure that arches upward in the middle, with a length sufficient to cover the top area of ​​the ankle joint. A through hole with the same arc-shaped trajectory is opened on the front side of the contact plate, and this through hole extends to the rear side of the contact plate. The rear end of the traction rope 6 passes through this through hole and connects to the contact plate. A soft pad is glued to the bottom of the contact plate to prevent it from pressing against the ankle joint. The soft pad can be made from a yoga mat or a piece of sponge.

[0038] A limiting component is installed on the top left side of the base plate 16 to control the swing amplitude of the patient's lower leg during rehabilitation, thereby ensuring that the patient's leg flexion and extension range can gradually increase according to the rehabilitation progress. This limiting component includes a universal bracket, which is a multi-joint structure. It includes two cylindrical first swing rods 2, located on the front and rear sides of the top of the base plate 16 respectively. A universal ball joint is connected to the bottom of each first swing rod 2, and a bolt is welded to the bottom of the ball joint. A screw hole is provided on the base plate 16, through which the bolt is screwed to secure the first swing rod 2. A connecting block 3 is welded to the top of the first swing rod 2, and a through hole is provided on the side of the connecting block 3, into which a wing bolt is installed. The universal bracket also includes a second swing rod 4, which is a cylindrical rod with connecting blocks 3 welded to both ends. The connecting block 3 at the left end of the second swing rod 4 is coaxially arranged with the connecting block 3 on the first swing rod 2 on the same side, and the end faces of the connecting block 3 at the left end of the second swing rod 4 and the connecting block 3 on the first swing rod 2 opposite each other are provided with threaded countersunk holes. The threaded section of the wing bolt on the connecting block 3 at the top of the first swing rod 2 is screwed into the threaded countersunk hole, hinged to the first swing rod 2 and the second swing rod 4, so that the second swing rod 4 can swing at a certain angle relative to the first swing rod 2. Optionally, another second swing rod 4 with the same structure can be connected to the right end of the second swing rod 4 (the connecting block 3 at the left end of this second swing rod 4 is provided with a threaded through hole) to increase the swing amplitude and angle of the limiting assembly. A rectangular plastic limiting plate 17 is glued between the two rightmost second swing rods 4.

[0039] A third swing rod is hinged to the right end of each of the two rightmost second swing rods 4. The third swing rod is a round rod structure, with a connecting round block 3 with a through hole welded to its left end. It is coaxially distributed with the connecting round block 4 at the right end of the rightmost second swing rod 4 and is also hinged to the third swing rod using a wing bolt. A connecting rod 5 is welded to the free end (right end) of the third swing rod. A rectangular plastic limiting plate 17 is also glued to the top of the two second swing rods 4 and the connecting rod 5.

[0040] The required range of leg flexion and extension differs in the early, middle, and late stages of rehabilitation. For example, in the early stages of rehabilitation, patients may be required to perform small-amplitude flexion and extension, while in the later stages, larger-amplitude flexion and extension are needed. During the early stages of rehabilitation, first adjust the first swing rod 2 to swing towards the second plate 7 at a specified angle. Then, adjust the two second swing rods 4 and the third swing rod to swing upwards to a specified angle, ensuring that the two limiting plates 17 are below the initial small-amplitude leg flexion and extension range. Finally, tighten the butterfly bolts connecting the first, second, and third swing rods to prevent excessive leg flexion during exercise, which could lead to an excessively large swing range.

[0041] The top of the front fixed seat 13 and the rear fixed seat 1 are provided with placement slots along their length, and the front guide rod 23 and the rear guide rod 22 are respectively installed in the corresponding placement slots. The left and right ends of the front guide rod 23 and the rear guide rod 22 can be welded to the left and right walls of the corresponding placement slots. The rear fixed seat 1, located behind the top surface of the base plate 16, has a first stroke groove 1-1 formed laterally on its rear end face. The rear slider 19 inside the rear fixed seat 1 has a threaded through hole at its rear end, and a limit bolt 21 (such as a wing bolt) is installed in the threaded through hole. The rear end of the limit bolt 21 extends out from the first stroke groove 1-1. When the slider is adjusted to the designated position on the rear guide rod 22, the limit bolt 21 is tightened, causing its threaded section to press against the side of the rear guide rod 22, generating friction and fixing the rear slider 19 in the current position.

[0042] To enable the front slider 14 and the rear slider 19 to slide synchronously, a cavity is provided at the bottom of the base. A second stroke groove is provided at the bottom of the front fixed seat 13 below the front guide rod 23, and a third stroke groove is provided on the top surface of the base plate 16 below the second stroke groove, communicating with the cavity. Similarly, a second stroke groove is provided at the bottom of the rear fixed seat 1 below the rear guide rod 22, and a third stroke groove is also provided on the top surface of the base plate 16 below the second stroke groove, communicating with the cavity. A linkage rod 24 is provided within the cavity to connect the slider on the front side of the base plate 16 to the slider on the rear side. Specifically, the linkage rod 24 is a metal tube. The rear end of the linkage rod 24 is bent upwards and passes sequentially through the third stroke groove on the rear side of the base plate 16 and the second stroke groove of the rear fixed seat 1, welding to the bottom of the rear slider 19. The front end of the linkage rod 24 passes upwards once through the third stroke groove on the front side of the base plate 16 and the second stroke groove of the front fixed seat 13, welding to the bottom of the front slider 14.

[0043] In another embodiment, such as Figure 4-8 As shown, the outer wall of the front guide rod 23 located in the front fixing seat 13 on the front side of the top face of the base plate 16 is threaded, and the length of the thread is equal to that of the placement groove. A through hole is provided at the left end of the front fixing seat 13, and the front guide rod 23 is disposed in the placement groove, with its left end rotatably positioned within the through hole at the left end of the front fixing seat 13. A semi-circular threaded groove is provided at the bottom of the front slider 14 within the front fixing seat 13, and the threaded groove engages with the thread on the front guide rod 23. Rotating the front guide rod 23 drives the front slider 14 to move via the threaded transmission, allowing for flexible adjustment of the position of the front slider 14. Simultaneously, when the rotation of the front guide rod 23 is stopped, the slider can be fixed in its current position.

[0044] To prevent the front slider 14 from slipping off the front guide rod 23 during movement, an elastic locking assembly is provided inside the slider within the front fixed seat 13. Specifically, the elastic locking assembly includes a locking end 31, a pressing end 32, and a sliding plate 30. The locking end 31 is a cylindrical pin. The pressing end 32 is also a cylindrical pin, but its length and diameter are larger than those of the locking end 31. The sliding plate 30 is a rectangular metal plate. The locking end 31 is located below the pressing end 32, and the sliding plate 30 is located to the right of the locking end 31 and the pressing end 32. The right sidewalls of the locking end 31 and the pressing end 32 are respectively threaded, and the sliding plate 30 has two screw holes. The locking end 31 and the pressing end 32 are horizontally screwed into the screw holes on the sliding plate 30. On the left end face of the sliding plate 30, between the locking end 31 and the pressing end 32, a cylindrical protrusion is integrally formed.

[0045] The bottom left and right sides of the front slider 14 are respectively provided with countersunk holes. On the side of these countersunk holes facing the outside of the slider, a first sliding hole and a second sliding hole are respectively provided, and the first and second sliding holes are respectively connected to the corresponding countersunk holes. The first sliding hole is located above the fixed base, and the second sliding hole is located below the first sliding hole. The pressing end 32 is slidably installed in the first sliding hole, and the snap-fit ​​end 31 is slidably installed in the second sliding hole. The width of the countersunk hole allows the sliding plate 30 to slide a certain distance within the countersunk hole.

[0046] A through hole is provided on the front end face of the slider, located between the first sliding hole and the second sliding hole, and a spring 33 is installed in the through hole. A rectangular snap-fit ​​groove is provided on the front side wall and the rear side wall inside the front fixed seat 13, and the snap-fit ​​end 31 is movably snapped into the snap-fit ​​groove.

[0047] When installing the elastic snap-fit ​​assembly, first insert the spring 33 of the corresponding diameter into the through hole. Then, insert a sliding plate 30 into each of the two countersunk holes, ensuring that the tops of the two sliding plates 30 pass over both ends of the spring 33 and contact the top wall inside the corresponding countersunk hole. At this time, the left end of the spring 33 covers the protrusion on the sliding plate 30 in the left countersunk hole and abuts against the right end face of the sliding plate 30 on that side; the right end of the spring 33 covers the protrusion on the sliding plate 30 in the right countersunk hole and abuts against the left end face of the sliding plate 30 on that side. The two protrusions restrict both ends of the spring 33, preventing the ends of the spring 33 from swinging or tilting. Then, insert the pressing end 32 into the first sliding hole and screw it into the corresponding screw hole on the sliding plate 30 through its thread. Insert the snap-fit ​​end 31 into the second sliding hole and screw it into the corresponding screw hole on the sliding plate 30 through its thread. The sliding plate 30 is prevented from falling out of the countersunk hole by the pushing of the spring 33 and the limiting of the pressing end 32 and the snap-fit ​​end 31.

[0048] The length of the pressing end 32 protruding from the front slider 14 is greater than the length of the snap-fit ​​end 31 protruding from the front slider 14. When the front slider 14 is installed on the front fixed seat 13, pressing the pressing end 32 with the thumb and forefinger will cause the sliding plate 30 and the snap-fit ​​end 31 to slide inward towards the front slider 14. The end of the snap-fit ​​end 31 retracts into the second sliding hole. At this time, the bottom of the front slider 14 can be inserted into the fixing groove of the front fixed seat 13. Moving the front slider 14 left and right will cause the arc-shaped thread at the bottom to engage with the thread of the front guide rod 23. Releasing the pressing end 32 will push the sliding plate 30 to reset the pressing end 32 and the snap-fit ​​end 31. At this time, the snap-fit ​​end 31 will snap into the snap-fit ​​groove on the same side. The snap-fit ​​end 31 is limited by the snap-fit ​​groove and will not come out upward, thus preventing the front slider 14 from coming off the front fixed seat 13.

[0049] In this embodiment, a snap-fit ​​part 34 is welded to the top of the bend at the front end of the linkage rod 24. The snap-fit ​​part 34 is a channel steel with the opening facing upward. Two recesses are provided at the bottom of the front slider 14, which are snap-fitted to the top of the channel steel respectively. The two ends of the U-shaped opening of the channel steel are snap-fitted into the corresponding recesses, thereby realizing linkage with the front slider 14 and driving the rear slider 19 to slide together.

[0050] A through hole is also provided on the right side of the front fixed seat 13, and the right end of the front guide rod 23 can be rotatably extended into the through hole.

[0051] In addition, this embodiment may optionally install a linkage assembly to drive the front guide rod 23 to rotate simultaneously with the rotation of the rotating rod 10. Specifically, the linkage assembly includes a transmission wheel 25 with a pulley structure, which is fixedly installed on the rotating rod 10 and located on the front side of the first plate 9. On the right side of the guide rod, a second bevel gear 29 is fixedly sleeved, with the teeth of the second bevel gear 29 angled to the right. A rotating shaft 28 is fixedly connected to its axis, and the right end of the rotating shaft 28 rotatably extends into the through hole on the right side of the front fixed seat 13. On the right rear side of the second bevel gear 29, a first bevel gear 27 is engaged. A through hole is opened on the rear end face of the front fixed seat 13 at the location of the first bevel gear 27. A round shaft is fixedly installed in the shaft hole of the first bevel gear 27 and passes through the through hole. A synchronous pulley 36 with a pulley structure is fixedly installed on the side wall of the end of the round shaft that passes through the front fixed seat 13. A synchronous belt 26 is installed on the transmission wheel 25 and the synchronous pulley 36. When the rotating shaft rotates, the transmission wheel 25 drives the synchronous wheel 36 to rotate, which in turn drives the first bevel gear 27, the second bevel gear 29 and the front guide rod 23 to rotate.

[0052] Because the folding plate can swing, the length of the timing belt 26 may change when the first plate 9 swings. Therefore, a tensioning pulley 35 is also installed inside the timing belt 26 to adjust its length. The tensioning pulley 35 is located to the lower right of the drive pulley 25, and a cylindrical bushing is fixedly installed in the shaft hole of the tensioning pulley 35.

[0053] A fixing post 37 is vertically mounted on the top surface of the base plate 16 behind the synchronous pulley 36. A metal plate is welded to the bottom surface of the fixing post 37, which is then welded to the base plate 16, or connected with screws through threaded holes. At the front end of the fixing post 37, a through hole coaxial with the round shaft is provided, and a bolt is screwed into the through hole with clearance fit. A threaded countersunk hole is provided at the rear end of the round shaft, and the bolt connects to this countersunk hole, stably connecting the rear end of the round shaft. There is a slight gap between the rear end face of the round shaft and the front end of the fixing post 37 to ensure reduced forward and backward displacement and oscillation during the rotation of the first bevel gear 27. At the top rear end of the fixing post 37, a threaded hole is provided, and a wing bolt is screwed into the threaded hole. A nut is screwed to the front end of the wing bolt, and the rear end face of the nut contacts the front end face of the fixing post 37. A long rectangular swing arm 38 is installed on the rear side of the top of the fixed column 37. The bottom front end of the swing arm 38 has a through hole. It is fitted onto the wing bolt on the top of the fixed column 37 through the through hole with a gap fit. Tightening the wing bolt can squeeze the rear end of the swing arm 38 through the wing nut, so that the front end of the swing arm 38 contacts the front end of the fixed column 37, forming static friction to achieve fixation.

[0054] A through hole is also provided on the top front end face of the swing arm 38. A bolt is installed in the through hole with clearance fit. The bolt passes through the bushing of the tension wheel 35, and a nut is screwed into the front end of the bolt so that the rear end of the nut contacts the front end face of the bushing (the bushing can rotate). The rear end face of the bushing contacts the front end face of the swing arm 38, thereby fixing the tension wheel 35 at the current height position.

[0055] Key parameters of this linkage assembly, such as the speed ratio, bevel gear module and number of teeth, helix angle and pressure angle, tooth profile and pitch of the synchronous belt 26, center distance between the transmission pulley 25 and the synchronous pulley 36, preload of the synchronous belt 26, and adjustment range of the tension pulley 35, were all determined through testing before use to ensure that each parameter meets the requirements for transmission smoothness and adjustment accuracy under different working conditions. Multiple linkage assembly schemes of different specifications can be designed based on the above parameters for patients with different rehabilitation needs and leg sizes.

[0056] When using this device, place the base plate 16 stably in a bed-like position to prevent movement during use. Based on the initial flexion angle required for the patient's rehabilitation, lift the second plate 7 and insert its bottom into the gap between the two positioning ribs 18 at the corresponding positions, thus fixing the second plate 7 at the desired angle. The positioning ribs 18 are evenly distributed, providing multiple fixed positions for selection.

[0057] The patient sits on the bed, with the back of the thigh to be rehabilitated resting on the right top surface of the first plate 9, and the back of the lower leg resting on the left top surface of the second plate 7, so that the popliteal fossa is above the hinge point of the first plate 9 and the second plate 7. The traction rope 6 between the front pulley 15 and the rear pulley 20 is looped around the patient's foot (or ankle), and the padding layer on the contact plate is adjusted to contact the top surface area of ​​the foot. The angle between the traction rope 6 and the lower leg is observed, and the front slider 14 and the rear slider 19 are slid to adjust the horizontal position of the front pulley 15 and the rear pulley 20, so that the angle between the traction rope 6 and the lower leg is close to vertical. If a linkage assembly is installed, the verticality between the traction rope 6 and the lower leg is maintained automatically by the linkage assembly.

[0058] Turning handwheel 12 rotates the rotating rod 10 and tightens the traction rope 6. The traction rope 6 pulls the patient's foot closer to the rotating rod 10, while simultaneously pressing and fixing the patient's lower leg to the second plate 7. The patient begins to actively extend their leg, pushing the second plate 7 open. At the same time, medical staff or the patient themselves operate handwheel 12 to control the rotation of the rotating rod 10. According to the needs of the rehabilitation stage, the tension of the traction rope 6 is controlled by adjusting the rotation speed and direction of the rotating rod 10 to apply appropriate resistance to the leg extension movement. As the leg extension range increases, handwheel 12 gradually releases the traction rope 6 wrapped around the rotating rod 10, allowing the lower leg to continue extending.

[0059] Observe the angle between the traction rope 6 and the lower leg during leg extension. When the leg extension range increases, causing the angle between the traction rope 6 and the lower leg to deviate significantly from the vertical position, pause the training, manually slide the front slider 14 and the rear slider 19, and adjust the positions of the front pulley 15 and the rear pulley 20 to restore the angle to a near-vertical state before continuing the training. If a linkage component is installed, this step is completed by the linkage component.

[0060] In the initial rehabilitation phase, when small-amplitude flexion and extension are required, loosen the butterfly bolts on the two first swing rods 2, swing the first swing rods 2 towards the second plate 7 to the specified angle, and swing the second swing rod 4 upward to the specified angle, so that the limiting plate 17 is in the set position of the lower leg flexion range. Then tighten the two butterfly bolts. During training, the lower leg will be blocked by the limiting plate 17 when flexed to this position, preventing over-flexion. In the intermediate rehabilitation phase, when medium-amplitude flexion and extension are required, loosen the butterfly bolts, adjust the position of the limiting plate 17 downward, so that the lower leg can flex to a larger angle, and then tighten it to fix it. In the later rehabilitation phase, when large-amplitude flexion and extension are required, the position of the limiting plate 17 can be further lowered, or, depending on the rehabilitation progress, the limiting plate 17 can be completely moved to a position that does not affect flexion, so that the lower leg can complete the full range of flexion and extension.

[0061] When the pulley position needs to be changed and the linkage assembly is not installed, first loosen the limiting bolt 21 on the rear slider 19 to allow the rear slider 19 to slide freely, while simultaneously driving the front slider 14 to slide via the linkage rod 24. After moving the rear slider 19 along the rear guide rod 22 to the target position, tighten the limiting bolt 21 so that its threaded section presses against the side of the rear guide rod 22 to fix the rear slider 19. If the front guide rod 23 is threaded, the adjustment of the front slider 14 is achieved by rotating the front guide rod 23. That is, rotating the front guide rod 23 drives the front slider 14 to move along the front guide rod 23 through threaded transmission. When rotation stops, the front slider 14 is self-locked and fixed in the current position. During the movement of the front slider 14, the elastic locking assembly ensures that it will not come off the front fixed seat 13.

[0062] If the linkage component is installed, when the rotating rod 10 rotates, it will automatically drive the front guide rod 23 to rotate through the transmission chain of the transmission wheel 25, the synchronous belt 26, the synchronous pulley 36, and the bevel gear set. Specifically, assuming that rotating the rotating rod 10 clockwise releases the traction rope 6, the transmission wheel 25, the synchronous pulley 36, and the first bevel gear 27 will all rotate clockwise. When viewed from the side, the second bevel gear 29 and the front guide rod 23 will also rotate clockwise. At this time, the front slider 14 moves to the left of the front guide rod 23.

[0063] It should be understood that all the above embodiments are exemplary and not restrictive. Various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of this application should be within the protection scope of this application.

Claims

1. A postoperative exercise device for knee joint surgery, characterized in that: Includes base components, adjustment components, and support components; The base component includes a base plate, and the top of the base plate is provided with a plurality of positioning ribs. The positioning ribs are arranged along the longitudinal direction of the base plate, and the positioning ribs are distributed at equal intervals. The adjusting component is located on the top of the base plate and on the front and rear sides of the positioning rib. The adjusting component includes a fixed seat, which is arranged laterally along the base plate. A guide rod is provided on the top of the fixed seat, and a slider is slidably provided on the guide rod. The slider slides along the length of the guide rod, and a pulley is provided on the top of the slider. The supporting component includes a folding plate, which includes a first plate and a second plate. The first plate is located to the right of the second plate. The right end of the first plate is swayably connected to the right side of the top surface of the base plate. A rotating rod is provided on the left end face of the first plate. A traction rope is provided on the front side of the rotating rod. The other end of the traction rope passes through the front pulley and the rear pulley in sequence and is connected to the rear side of the rotating rod.

2. The apparatus according to claim 1, characterized in that: A limiting component is provided on the left side of the top surface of the base plate. The limiting component includes a first swing rod, which consists of two rods respectively located on the front and rear sides of the top of the base plate. A second swing rod is adjustablely connected to the top of the first swing rod. A connecting rod is connected to the free ends of the two second swing rods. A limiting plate is provided on the top of the two second swing rods and the connecting rod.

3. The apparatus according to claim 1, characterized in that: The top of the fixed base has a placement groove, and the guide rod is placed in the placement groove.

4. The apparatus according to claim 1, characterized in that: The rear end of the fixed seat located on the rear side of the top surface of the base plate has a first stroke groove opened in the transverse direction; the rear end of the slider in the fixed seat has a threaded through hole, and a limit bolt is provided in the threaded through hole, the rear end of the limit bolt protruding from the first stroke groove.

5. The apparatus according to claim 1, characterized in that: The outer wall of the guide rod located in the fixed seat on the front side of the top of the base plate is threaded, and the guide rod is rotatably disposed in the placement groove; the bottom of the slider in the fixed seat is provided with a semi-circular threaded groove, and the threaded groove and the thread mesh with each other.

6. The apparatus according to claim 5, characterized in that: The slider inside the fixed seat located on the front side of the top of the base plate is provided with an elastic snap-fit ​​assembly, which includes a snap-fit ​​end; the side wall inside the fixed seat is provided with a snap-fit ​​groove, and the snap-fit ​​end is movably snapped into the snap-fit ​​groove.

7. The apparatus according to any one of claims 1-5, characterized in that: The bottom of the base has a cavity, and a linkage rod is provided in the cavity to connect the slider on the front side of the base plate with the slider on the rear side.

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