Telescopic knee joint supporting strip

Abstract

The telescopic knee joint supporting strip comprises a shaft rod, and first rotating discs are symmetrically and rotationally connected to the shaft rod. According to the damping system, the piston cylinder, the fluid groove, the hollow rod, the piston head, the hollow sealing ring and other structures are arranged, the fluid groove is filled with damping oil, the knee joint supporting strip can generate adjustable damping force during bending and stretching movement, the damping system effectively buffers sudden movement of the knee joint, impact and vibration on the joint are reduced, and the damping effect is improved. Meanwhile, the position of the piston in the piston cylinder can be changed by adjusting the screw rod through the knob, so that the damping force can be accurately controlled, the requirements of different users or different activity intensities (such as walking, running or rehabilitation training) are met, and on the whole, the using comfort and stability are improved. The supporting strip has the advantages of being stable in movement, flexible in adjustment, capable of protecting knee joints from being damaged and the like and is particularly suitable for the fields of rehabilitation medicine and movement protection.

Description

Technical Field

[0001] This invention relates to the field of knee joint brace technology, specifically a telescopic knee joint brace. Background Technology

[0002] With the continuous development of medical rehabilitation and sports protection, knee braces, as an important assistive device, are widely used in post-operative rehabilitation of the knee joint, protection of ligament injuries, and daily activities of patients with osteoarthritis. Their core function is to provide appropriate stability, limitation protection, and movement control while allowing the knee joint to perform necessary movements.

[0003] However, existing knee braces or joint supports still have many shortcomings in terms of structure and function. First, many traditional braces use a simple hinge structure, which can only realize the flexion and extension movements of the knee joint, but lacks an effective damping and cushioning mechanism. This causes the knee joint to experience impact due to inertia at the end of extension and the beginning of flexion during walking or exercise, failing to provide smooth cushioning for sudden and excessive joint movements. This not only reduces the comfort of use, but may also cause secondary damage to damaged joints and ligaments. Therefore, we propose a telescopic knee brace to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a telescopic knee joint support to solve the problems currently found in the market as described in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a telescopic knee joint support, comprising a shaft, on which a first turntable is symmetrically rotatably connected, and on the upper and lower sides of the shaft near the first turntable, a second turntable is symmetrically rotatably connected, wherein... A first support bar is fixedly connected between the first turntables, and a second support bar is fixedly connected between the second turntables. A piston cylinder is fixedly connected to the top of the second turntable. A fluid groove is opened inside the piston cylinder. One end of the piston cylinder is connected to a telescopic groove. A hollow rod passes through the telescopic groove. One end of the hollow rod located in the fluid groove is connected to a piston head. A hollow sealing ring is installed on the ring side of the piston head. The hollow rod is connected to the hollow sealing ring through a connecting groove. A piston cylinder is fixedly installed on the top of the first turntable. A screw is threadedly connected to the top of the piston cylinder. A piston is fixedly connected to one end of the screw inside the piston cylinder. The end of the hollow rod away from the piston cylinder is connected to the lower side of the piston cylinder. A knob is fixedly connected to the top of the screw. A pre-tightening spring washer is fitted on the screw between the knob and the piston cylinder. Telescopic support bars are fitted on both the first and second support bars. The telescopic support bars are locked in place by a locking mechanism.

[0006] Preferably, a first arc-shaped groove and a second arc-shaped groove are respectively opened on both sides of the second turntable. The second turntable has slots that are equidistantly connected to the positions of the first arc-shaped groove and the second arc-shaped groove. A first baffle and a second baffle are respectively fixedly connected to both sides of the first turntable. A first push rod is sleeved on the outer side of the shaft corresponding to the first arc-shaped groove, and a second push rod is sleeved on the outer side of the shaft corresponding to the second arc-shaped groove. The first push rod and the second push rod are sleeved on the shaft through a sliding groove. A first spring is installed between the inner end of the sliding groove and the shaft. A locking rod is fixedly connected to the first push rod and the second push rod at the positions of the slots. A limiting plate is rotatably connected to the shaft near the top of the second turntable. The limiting plate has a locking rod groove at the bottom of the slot. A release limiting groove communicating with the locking rod groove is opened on one side of the limiting plate. Limiting plates are symmetrically fixedly connected to both ends of the shaft.

[0007] Preferably, the arcs of the first arc groove and the second arc groove are 120° and 90° respectively, and the inner widths of the first arc groove and the second arc groove match the outer diameter of the clamp rod.

[0008] Preferably, the two ends of the slide groove are arc-shaped grooves, and the inner diameter of the arc-shaped grooves at both ends of the slide groove matches the outer diameter of the shaft, and the inner width of the slide groove matches the outer diameter of the shaft.

[0009] Preferably, both the piston cylinder and the hollow rod are arc-shaped, and the central axis of the piston cylinder and the hollow rod coincides with the central axis of the shaft, and the fluid groove inside the piston cylinder is filled with damping oil.

[0010] Preferably, the inner wall of the telescopic groove is provided with a sealing ring for sealing connection with the hollow rod.

[0011] Preferably, the locking mechanism includes a strap frame, with strap frames symmetrically fixedly connected to both sides of the telescopic support bar. Adjustment grooves are provided on both the first and second support bars. Locking teeth are symmetrically fixedly connected to the inner walls of both sides of the adjustment grooves. A protective frame is fixedly connected to the top of the telescopic support bar near the opening. A button groove is provided on the top of the protective frame. The telescopic support bar is connected to the button groove via a guide rod groove. A guide rod passes through the guide rod groove. A gear is fixedly connected to the bottom end of the guide rod. A notch is provided at the bottom end of the telescopic support bar corresponding to the gear. A button is fixedly connected to the end of the guide rod located in the button groove. A second spring is sleeved on the guide rod between the button and the bottom of the button groove.

[0012] Preferably, the pitch of the locking teeth is equal to the pitch of the gear teeth, and the external dimension of the gear is smaller than the internal dimension of the notch.

[0013] Preferably, the guide rod is rectangular columnar, and the external dimensions of the guide rod match the internal dimensions of the guide rod groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the design of a piston cylinder, fluid groove, hollow rod, piston head, and hollow sealing ring, and by filling the fluid groove with damping oil, enables the knee joint support to generate adjustable damping force during flexion and extension movements. This damping system effectively buffers sudden knee joint movements, reduces impact and vibration on the joint, and improves comfort and stability. Furthermore, by adjusting the screw with a knob, the position of the piston within the piston cylinder can be changed, thereby precisely controlling the magnitude of the damping force to meet the needs of different users or different activity intensities (such as walking, running, or rehabilitation training). Overall, this support offers advantages such as smooth movement, flexible adjustment, and protection of the knee joint from injury, making it particularly suitable for rehabilitation medicine and sports protection.

[0015] In this invention, the user can press the button with a single finger to compress the second spring via the guide rod, causing the gear to enter the notch and disengage from the locking teeth, thereby achieving rapid length adjustment of the telescopic support. After adjustment, releasing the button allows the gear to automatically reset and re-engage with the locking teeth under the action of the second spring, realizing convenient operation of adjusting with a single press and locking with a single release.

[0016] This invention, by setting a first baffle and a second baffle on a first turntable, and opening a first arc-shaped groove and a second arc-shaped groove with a specific curvature on a second turntable, as well as multiple locking grooves connected thereto, sets a clear and adjustable range of motion for the flexion and extension movements of the knee joint. When the locking rod is engaged in different locking grooves under the action of the spring, the support can be stably locked at multiple preset angles, effectively preventing excessive flexion or extension of the knee joint, and providing precise joint mobility protection for different stages of rehabilitation. The limiting plate and the locking rod groove and adjustment groove on it constitute a safety selection mechanism. By rotating the limiting plate, one push rod can be selectively allowed to pop out and engage in the locking groove, while locking another push rod, or locking both push rods at the same time. This can prevent accidental unlocking during movement and ensure stability and safety in specific rehabilitation stages, such as when only flexion is allowed and not full extension is not allowed. The limiting plates at both ends of the shaft prevent the entire assembly from detaching from the shaft, further enhancing the reliability of the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4 This is a schematic cross-sectional view of the piston cylinder structure of the present invention; Figure 5 This is a schematic cross-sectional view of the piston cylinder of the present invention; Figure 6 This is a top view schematic diagram of the first and second turntables of the present invention; Figure 7 This is a three-dimensional structural diagram of the first push rod and the second push rod of the present invention; Figure 8 For the present invention Figure 3 A magnified view of the structure at point A in the middle; Figure 9 For the present invention Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0018] In the diagram: 1. Shaft; 2. First turntable; 3. Second turntable; 4. First support bar; 5. Second support bar; 6. First arc-shaped groove; 7. Second arc-shaped groove; 8. Slot; 9. First baffle; 10. Second baffle; 11. First push rod; 12. Second push rod; 13. Slide groove; 14. First spring; 15. Locking rod; 16. Limiting plate; 17. Locking rod groove; 18. Release limiting groove; 19. Limiting plate; 20. Piston cylinder; 21. Fluid groove; 22. 23. Telescopic groove; 24. Hollow rod; 25. Sealing ring; 26. Piston head; 27. Hollow sealing ring; 28. Connecting groove; 29. ​​Piston cylinder; 30. Screw; 31. Piston; 32. Knob; 33. Preload spring washer; 34. Telescopic support bar; 35. Strap bracket; 36. Adjustment groove; 37. Locking tooth; 38. Gear; 39. Notch; 40. Protective frame; 41. Button groove; 42. Guide rod groove; 43. Guide rod; 44. Button; 45. Second spring. Detailed Implementation

[0019] 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. Example

[0020] Please see Figures 1 to 9 The present invention provides a technical solution: a telescopic knee joint support, comprising a shaft 1, a first turntable 2 symmetrically rotatably connected to the shaft 1, and second turntables 3 symmetrically rotatably connected to the upper and lower sides of the shaft 1 near the first turntable 2, wherein... A first support bar 4 is fixedly connected between the first turntables 2, and a second support bar 5 is fixedly connected between the second turntables 3. A piston cylinder 20 is fixedly connected to the top of the second turntable 3. A fluid groove 21 is opened inside the piston cylinder 20. One end of the piston cylinder 20 is connected to a telescopic groove 22. A hollow rod 23 passes through the telescopic groove 22. One end of the hollow rod 23 is located in the fluid groove 21 and is connected to a piston head 25. A hollow sealing ring 26 is installed on the circumferential side of the piston head 25. The hollow rod 23 is connected to the hollow sealing ring 26 through a connecting groove 27. A piston cylinder 28 is fixedly installed on the top of the first turntable 2. A screw 29 is threadedly connected to the top of the piston cylinder 28. A piston 30 is fixedly connected to one end of the screw 29 inside the piston cylinder 28. The hollow rod 23 is connected to the piston cylinder 28 near the bottom at one end. A knob 31 is fixedly connected to the top of the screw 29. A pre-tightening spring washer 32 is fitted on the screw 29 between the knob 31 and the piston cylinder 28. Telescopic support bars 33 are fitted on both the first support bar 4 and the second support bar 5. The telescopic support bars 33 are locked by a locking mechanism. By incorporating a piston cylinder 20, a fluid groove 21, a hollow rod 23, a piston head 25, and a hollow sealing ring 26, and filling the fluid groove 21 with damping oil, the knee joint support can generate adjustable damping force during flexion and extension movements. This damping system effectively buffers sudden knee joint movements, reduces impact and vibration on the joint, and improves comfort and stability. Simultaneously, by rotating the knob 31 to adjust the screw 29, the position of the piston 30 within the piston cylinder 28 can be changed, thereby precisely controlling the magnitude of the damping force to meet the needs of different users or different activity intensities such as walking, running, or rehabilitation training. Overall, this support offers advantages such as smooth movement, flexible adjustment, and protection of the knee joint from injury, making it particularly suitable for rehabilitation medicine and sports protection. After adjusting the damping force via the knob 31, a pre-tightening spring pad 32 applies a pre-tightening force to the adjusting screw 29, preventing the adjusting screw 29 from automatically rotating due to patient movement.

[0021] Please see Figures 1 to 9The second turntable 3 has a first arc-shaped groove 6 and a second arc-shaped groove 7 on both sides. The second turntable 3 has equidistant slots 8 corresponding to the positions of the first arc-shaped groove 6 and the second arc-shaped groove 7. The first turntable 2 has a first baffle 9 and a second baffle 10 fixedly connected to both sides. A first push rod 11 is fitted onto the outer side of the shaft 1 corresponding to the first arc-shaped groove 6, and a second push rod 12 is fitted onto the outer side of the shaft 1 corresponding to the second arc-shaped groove 7. The first push rod 11 and the second push rod 12 are fitted onto the shaft 1 through a sliding groove 13. A first spring 14 is installed between the inner end of the sliding groove 13 and the shaft 1. The first push rod 11 and the second push rod 12... Each position of the rod 12 corresponding to the slot 8 is fixedly connected to a locking rod 15. The shaft 1 is rotatably connected to a limiting plate 16 near the top of the second turntable 3. The limiting plate 16 has a locking rod groove 17 at the bottom corresponding to the slot 8. A release groove 18 communicating with the locking rod groove 17 is provided on one side of the limiting plate 16. Limiting plates 19 are symmetrically fixedly connected to both ends of the shaft 1. The arcs of the first arc groove 6 and the second arc groove 7 are 120° and 90° respectively, and the inner widths of the first arc groove 6 and the second arc groove 7 match the outer diameter of the locking rod 15. The two ends of the slide groove 13 are arc grooves, and the arc grooves at both ends of the slide groove 13... The inner diameter matches the outer diameter of the shaft 1, and the inner width of the slide groove 13 matches the outer diameter of the shaft 1. By setting a first baffle 9 and a second baffle 10 on the first turntable 2, and opening a first arc-shaped groove 6 and a second arc-shaped groove 7 with a specific curvature on the second turntable 3, as well as multiple locking grooves 8 connected thereto, this structure sets a clear and adjustable range of motion for the flexion and extension movements of the knee joint. When the locking rod 15 is engaged in different locking grooves 8 under the action of the first spring 14, the support can be stably locked at multiple preset angles, effectively preventing excessive flexion or extension of the knee joint, thus facilitating rehabilitation. Providing precise protection for joint range of motion at different stages, the limiting plate 16 and its locking groove 17 and release limiting groove 18 constitute a safety selection mechanism. By rotating the limiting plate 16, the locking rod 15 of one push rod can be selectively allowed to pop out and lock into the locking groove 8, while locking the other push rod, or locking both push rods at the same time. This can prevent accidental unlocking during movement and ensure stability and safety in specific rehabilitation stages, such as when only flexion is allowed and not full extension is not. The limiting plates 19 at both ends of the shaft 1 prevent the entire assembly from detaching from the shaft, further enhancing the reliability of the structure.

[0022] Please see Figures 1 to 9 Both the piston cylinder 20 and the hollow rod 23 are arc-shaped, and the central axis of the piston cylinder 20 and the hollow rod 23 coincides with the central axis of the shaft 1. The fluid groove 21 of the piston cylinder 20 is filled with damping oil, and the inner wall of the telescopic groove 22 is provided with a sealing ring 24 for sealing connection with the hollow rod 23.

[0023] Please see Figures 1 to 9The locking mechanism includes a strap frame 34. Straps 34 are symmetrically fixedly connected to both sides of the telescopic support bar 33. Adjustment grooves 35 are provided on both the first support bar 4 and the second support bar 5. Locking teeth 36 are symmetrically fixedly connected to the inner walls of both sides of the adjustment grooves 35. A protective frame 39 is fixedly connected to the top of the telescopic support bar 33 near the opening. A button groove 40 is provided on the top of the protective frame 39. The telescopic support bar 33 is connected to the button groove 40 via a guide rod groove 41. A guide rod 42 passes through the guide rod groove 41. A gear 37 is fixedly connected to the bottom end of the guide rod 42. A notch 38 is provided on the telescopic support bar 33 corresponding to the bottom end of the gear 37. A button 43 is fixedly connected to one end of the guide rod 42 located in the button groove 40. The button 43 and the bottom of the button groove 40... A second spring 44 is fitted on the guide rod 42 between the parts. The pitch of the locking tooth 36 is equal to the pitch of the gear 37, and the external dimension of the gear 37 is smaller than the internal dimension of the notch 38. The guide rod 42 is rectangular columnar, and the external dimension of the guide rod 42 matches the internal dimension of the guide rod groove 41. The user can press the button 43 with one finger to compress the second spring 44 through the guide rod 42 and make the gear 37 enter the notch 38, so that the gear 37 disengages from the locking tooth 36, thereby realizing the rapid length adjustment of the telescopic support 33. After the adjustment is completed, the button 43 is released, and under the action of the second spring 44, the gear 37 automatically resets and re-engages with the locking tooth 36, realizing the convenient operation of adjusting with one press and locking with one release.

[0024] Working principle: This telescopic knee joint support features a piston cylinder 20, a fluid groove 21, a hollow rod 23, a piston head 25, and a hollow sealing ring 26. The fluid groove 21 is filled with damping oil, allowing the knee joint support to generate adjustable damping force during bending and extension movements. This damping system effectively buffers sudden knee joint movements, reducing impact and vibration on the joint, and improving comfort and stability. Simultaneously, by rotating the knob 31 to adjust the screw 29, the position of the piston 30 within the piston cylinder 28 can be changed, thus precisely controlling the damping force to suit the needs of different users or different activity intensities such as walking, running, or rehabilitation training. Overall, this support offers advantages such as smooth movement, flexible adjustment, and protection of the knee joint from injury, making it particularly suitable for rehabilitation medicine and sports protection. By setting a first baffle 9 and a second baffle 10 on the first turntable 2, and opening a first arc-shaped groove 6 and a second arc-shaped groove 7 with a specific curvature on the second turntable 3, along with multiple locking grooves 8 connected thereto, this structure sets a clear and adjustable range of motion for the flexion and extension movements of the knee joint. When the locking rod 15 is engaged in different locking grooves 8 under the action of the first spring 14, the support bar can be stably locked at multiple preset angles, effectively preventing excessive flexion or extension of the knee joint, providing precise joint mobility protection for different stages of rehabilitation. The positioning plate 16 and its locking groove 17 and release limiting groove 18 constitute a safety selection mechanism. By rotating the limiting plate 16, the locking rod 15 of one push rod can be selectively allowed to pop out and lock into the locking groove 8, while locking the other push rod, or locking both push rods at the same time. This can prevent accidental unlocking during exercise and ensure stability and safety in specific rehabilitation stages, such as when only flexion is allowed and not full extension is not allowed. The limiting plates 19 at both ends of the shaft 1 prevent the entire assembly from coming off the shaft, further enhancing the reliability of the structure. By pressing button 43 with a single finger, the user can compress the second spring 44 via guide rod 42, causing gear 37 to enter notch 38 and disengage from locking tooth 36, thereby achieving rapid length adjustment of telescopic support bar 33. After adjustment, releasing button 43 will cause gear 37 to automatically reset and re-engage with locking tooth 36 under the action of second spring 44, realizing convenient operation of adjusting with one press and locking with one release.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A telescopic knee joint support, comprising a shaft (1), characterized in that: A first turntable (2) is symmetrically rotatably connected to the shaft (1), and a second turntable (3) is symmetrically rotatably connected to the upper and lower sides of the shaft (1) near the first turntable (2). A first support bar (4) is fixedly connected between the first turntables (2), and a second support bar (5) is fixedly connected between the second turntables (3). A piston cylinder (20) is fixedly connected to the top of the second turntable (3). A fluid groove (21) is opened inside the piston cylinder (20). A telescopic groove (22) is connected to one end of the piston cylinder (20). A hollow rod (23) passes through the telescopic groove (22). One end of the hollow rod (23) is connected to a piston head (25) inside the fluid groove (21). A hollow sealing ring (26) is installed on the circumferential side of the piston head (25). The hollow rod (23) is connected to the hollow sealing ring (26) through a connecting groove (27). A piston cylinder (28) is fixedly installed on the top of the first turntable (2). A screw (29) is threadedly connected to the top of the piston cylinder (28). A piston (30) is fixedly connected to one end of the screw (29) inside the piston cylinder (28). The hollow rod (23) is connected to the piston cylinder (28) near the bottom at one end away from the piston cylinder (20). A knob (31) is fixedly connected to the top of the screw (29). A pre-tightening spring washer (32) is fitted on the screw (29) between the knob (31) and the piston cylinder (28). Telescopic support strips (33) are fitted on both the first support strip (4) and the second support strip (5). The telescopic support strips (33) are locked by a locking mechanism.

2. The telescopic knee joint support according to claim 1, characterized in that: The second turntable (3) has a first arc-shaped groove (6) and a second arc-shaped groove (7) respectively on both sides. The second turntable (3) has slots (8) equidistantly connected to the positions of the first arc-shaped groove (6) and the second arc-shaped groove (7). The first turntable (2) has a first baffle (9) and a second baffle (10) respectively fixedly connected to both sides. The shaft (1) has a first push rod (11) sleeved on the outside of the first arc-shaped groove (6), and the shaft (1) has a second push rod (12) sleeved on the outside of the second arc-shaped groove (7). The first push rod (11) and the second push rod (12) are sleeved on the outside of the second arc-shaped groove (7) through the sliding groove (13). On the shaft (1), a first spring (14) is installed between the inner end of the slide groove (13) and the shaft (1). The first push rod (11) and the second push rod (12) are fixedly connected to the corresponding slots (8) with locking rods (15). The shaft (1) is rotatably connected to a limiting plate (16) above the second turntable (3). The limiting plate (16) has a locking rod groove (17) at the bottom of the corresponding slot (8). The limiting plate (16) has a release limiting groove (18) connected to the locking rod groove (17) on one side. The two ends of the shaft (1) are symmetrically fixedly connected with limiting plates (19).

3. The telescopic knee joint support according to claim 2, characterized in that: The arcs of the first arc groove (6) and the second arc groove (7) are 120° and 90° respectively, and the inner widths of the first arc groove (6) and the second arc groove (7) match the outer diameter of the clamp rod (15).

4. The telescopic knee joint support according to claim 2, characterized in that: The two ends of the slide groove (13) are arc-shaped grooves, and the inner diameter of the arc-shaped grooves at both ends of the slide groove (13) matches the outer diameter of the shaft (1), and the inner width of the slide groove (13) matches the outer diameter of the shaft (1).

5. The telescopic knee joint support according to claim 1, characterized in that: Both the piston cylinder (20) and the hollow rod (23) are arc-shaped, and the central axis of the piston cylinder (20) and the hollow rod (23) coincides with the central axis of the shaft (1). Furthermore, the fluid groove (21) of the piston cylinder (20) is filled with damping oil.

6. The telescopic knee joint support according to claim 1, characterized in that: The inner wall of the expansion groove (22) is provided with a sealing ring (24) for sealing connection with the hollow rod (23).

7. The telescopic knee joint support according to claim 1, characterized in that: The locking mechanism includes a strap frame (34), and strap frames (34) are symmetrically fixedly connected to both sides of the telescopic support bar (33). Adjustment grooves (35) are provided on both the first support bar (4) and the second support bar (5). Locking teeth (36) are symmetrically fixedly connected to the inner walls of both sides of the adjustment grooves (35). A protective frame (39) is fixedly connected to the top of the telescopic support bar (33) near the opening. A button groove (40) is provided on the top of the protective frame (39). The telescopic support bar (33) contains... The part is connected to the button slot (40) through the guide rod slot (41). A guide rod (42) passes through the guide rod slot (41). A gear (37) is fixedly connected to the bottom end of the guide rod (42). The telescopic support (33) has a notch (38) at the bottom end corresponding to the gear (37). A button (43) is fixedly connected to one end of the guide rod (42) in the button slot (40). A second spring (44) is sleeved on the guide rod (42) between the button (43) and the bottom of the button slot (40).

8. The telescopic knee joint support according to claim 7, characterized in that: The pitch of the locking tooth (36) is equal to the pitch of the gear (37), and the external dimension of the gear (37) is smaller than the internal dimension of the notch (38).

9. The telescopic knee joint support according to claim 7, characterized in that: The guide rod (42) is a rectangular column, and the external dimensions of the guide rod (42) match the internal dimensions of the guide rod groove (41).

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