Joint distraction assembly

Abstract

The utility model discloses a joint extension assembly, include: shell, thigh mechanism, shank mechanism and drive mechanism, drive mechanism includes setting in the drive assembly of shell and the first hand wheel of rotationally wearing in the lateral wall of shell and being used for drive drive assembly rotation, the outer wall of shell is equipped with the arc through slot of being convenient for shank mechanism rotation, and shank mechanism passes through arc through slot and is connected with the output shaft cooperation of drive assembly in the shell cooperation. The utility model discloses a joint extension assembly uses, and thigh mechanism is fixed with the thigh of user through the bandage, and shank mechanism is fixed with the shank of user through the bandage, and manual rotation first hand wheel can drive drive assembly on drive mechanism rotation, and then can drive shank mechanism relative thigh mechanism rotation, moves around arc through slot simultaneously, realizes to the lower limbs of user and carries out bending and stretching, and can rotate any angle, and convenient operation.

Description

Technical Field

[0001] This utility model relates to the field of rehabilitation equipment technology in medical devices, specifically to a joint stretching component. Background Technology

[0002] When a severe injury occurs to the leg, such as a fracture of the femur, tibia, or patella, or nerve damage, knee stiffness or functional loss may occur due to the need for disease or treatment, such as pain after trauma or surgery, plaster casts or splints to fix the joint, or prolonged traction and immobilization. Active treatment and functional exercises are required to restore joint function.

[0003] Due to the shortage of rehabilitation therapists in clinical practice, auxiliary stretching devices are often used to assist in treatment. In existing technology, stretching devices typically consist of two pads adapted for lower limb flexion and a drive component that adjusts the rotation of the two pads to achieve lower limb flexion and extension. While this method allows for lower limb flexion and extension, the rotation angle cannot be arbitrarily adjusted during treatment. Furthermore, the passive movement of the two pads to extend or flex the lower limbs means that, for patients in the later stages of rehabilitation, the inability to actively adjust the flexion angle according to their own condition leads to poor subsequent rehabilitation effects. These devices are not only functionally limited but also inconvenient to operate, and prolonged fixed-angle flexion and extension fails to effectively exercise the leg muscles. Utility Model Content

[0004] The purpose of this invention is to provide a joint stretching component to solve the problem that the rotation angle of existing stretchers cannot be arbitrarily adjusted.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A joint stretching assembly includes: a housing, a thigh mechanism disposed at one end of the housing, a lower leg mechanism disposed at the other end of the housing, and a drive mechanism disposed on the housing for driving the lower leg mechanism to rotate relative to the thigh mechanism.

[0007] The drive mechanism includes a drive component disposed inside the housing and a first handwheel that rotatably passes through the side wall of the housing and is used to drive the drive component to rotate. The outer wall of the housing has an arc-shaped through groove to facilitate the rotation of the lower leg mechanism. The lower leg mechanism passes through the arc-shaped through groove and is connected to the output shaft of the drive component inside the housing.

[0008] Furthermore, the aforementioned drive assembly includes a first bevel gear rotatably disposed on the inner wall of the housing and connected to the lever of the first handwheel; a worm gear rotatably disposed on the inner wall of the housing and corresponding to the lever of the first handwheel; a second bevel gear disposed on the worm gear and meshing with the first bevel gear; a bearing connecting block rotatably disposed on the inner wall of the housing and located below the worm gear; a worm wheel rotatably disposed on the bearing connecting block and meshing with the worm gear; and a first separation shaft rotatably disposed on the inner wall of the housing and parallel to the lever of the first handwheel. The end of the first separation shaft rotatably engages with the worm wheel, and the first separation shaft abuts against the worm wheel through a locking component. The lower leg mechanism passes through an arc-shaped through groove and engages with the outer wall of the first separation shaft.

[0009] Furthermore, the aforementioned worm gear has a toothed hole along the axial direction, and the minimum inner diameter of the toothed hole is greater than the outer diameter of the separation shaft.

[0010] Furthermore, the aforementioned locking component includes a second handwheel located outside the housing and on the same side as the first handwheel, and a second separation shaft threadedly connected to the first separation shaft and connected to the second handwheel. The side wall of the first separation shaft has a through hole, and a ball bearing is installed in the through hole.

[0011] When the outer wall of the end of the second release shaft away from the second handwheel contacts the ball, the first release shaft abuts against the inner wall of the toothed hole through the ball.

[0012] Furthermore, the interior of the aforementioned separating shaft is provided with a threaded hole and a round hole in sequence along the axial direction, with the diameter of the round hole being larger than that of the threaded hole.

[0013] The second separation shaft includes a threaded part, a transition part, and a clamping part connected axially in sequence. The outer diameter of the threaded part is smaller than the outer diameter of the clamping part, and the outer diameter of the transition part gradually increases from the threaded part to the clamping part. The end of the threaded part away from the transition part extends out of the housing and is connected to the second handwheel. The threaded part is connected to the threaded hole, the inner diameter of the hole matches the outer diameter of the clamping part, and the bearing connecting block is provided with a clearance groove that matches the clamping part.

[0014] When the outer wall of the clamping part contacts the ball, the separating shaft abuts against the inner wall of the toothed hole through the ball.

[0015] Furthermore, the side wall adjacent to the second handwheel of the aforementioned outer shell is provided with an arc-shaped guide groove, and the central axis of the arc-shaped guide groove coincides with the central axis of the separation shaft one. The worm gear is provided with a number of limiting holes one at intervals along its axial direction, and the bearing connecting block is provided with a number of limiting holes two at intervals along its axial direction, which correspond to the limiting holes one.

[0016] The drive assembly also includes a limiting pin, one end of which is located outside the housing, and the other end of which passes through the arc-shaped guide groove and the limiting hole one in sequence and is inserted into the limiting hole two.

[0017] Furthermore, the rod portion of the aforementioned limiting pin located outside the outer casing is provided with a pull ring.

[0018] Furthermore, the thigh mechanism includes a thigh wall and a thigh support adjustment block. One end of the thigh wall passes through the side wall of the outer shell and is connected to its inner wall. The other end of the thigh wall is slidably engaged with the thigh support adjustment block, and the thigh wall is locked to the thigh support adjustment block by a screw.

[0019] Furthermore, the aforementioned lower leg mechanism includes a lower leg wall and a lower leg support adjustment block. One end of the lower leg wall passes through an arc-shaped through groove and is connected to the outer wall of the separation shaft. The other end of the lower leg wall is slidably engaged with the lower leg support adjustment block, and the lower leg wall is locked to the lower leg support adjustment block by a screw. The lower leg support adjustment block corresponds to the thigh support adjustment block.

[0020] Furthermore, a display screen is embedded in the outer wall of the aforementioned housing, and a battery, a control board, and a rotary potentiometer are respectively installed on the inner wall of the housing. The control board is communicatively connected to the display screen, the battery, and the rotary potentiometer. A switch and a charging port electrically connected to the battery are respectively installed on the outer wall of the housing.

[0021] A first gear is provided on the outer wall of the separation shaft, and a second gear that meshes with the first gear is provided on the rotating shaft of the rotary potentiometer.

[0022] This utility model has the following beneficial effects:

[0023] 1. The joint extension assembly of this utility model has a thigh mechanism and a lower leg mechanism respectively set at both ends of the outer shell. In use, the thigh mechanism is fixed to the user's thigh by straps, and the lower leg mechanism is fixed to the user's lower leg by straps. By manually turning the first handwheel, the drive component on the drive mechanism can be driven to rotate, which in turn drives the lower leg mechanism to rotate relative to the thigh mechanism and move around the arc-shaped through groove, so as to achieve bending and extension of the user's lower limbs. Moreover, the rotation angle of the first handwheel can be determined according to the actual situation of the user, and can be rotated at any angle, making it easy to operate.

[0024] 2. In the joint extension assembly of this utility model, the first separation shaft is abutted against the worm gear through a locking component. At this time, manually turning the first handwheel can drive the first bevel gear to rotate. The first bevel gear drives the worm to rotate through the second bevel gear. The worm drives the worm wheel to rotate, and the worm wheel drives the first separation shaft to rotate. Ultimately, this causes the lower leg mechanism to rotate relative to the thigh mechanism, thereby achieving bending and extension of the lower limb. When the first separation shaft is not abutted against the worm wheel, the user can actively drive the lower leg mechanism to drive the first separation shaft to rotate. This allows the user to actively adjust the bending angle between the lower leg mechanism and the thigh mechanism according to their own situation, making it more suitable for patients in the middle and late stages of rehabilitation, thus achieving effective exercise of the leg muscles.

[0025] 3. This utility model, by setting a limiting pin, allows the limiting pin to pass through the arc-shaped guide groove and the limiting hole to be inserted into the limiting hole when the first separating shaft is not pressed against the worm gear. When the user actively drives the lower leg mechanism to rotate, the rotation of the lower leg mechanism will drive the first separating shaft to rotate. At this time, the worm gear does not rotate, so the limiting pin does not rotate. During the rotation, the outer wall of the limiting pin will limit the rotation angle of the lower leg mechanism, thus restricting the rotation angle of the lower leg mechanism and allowing the lower leg mechanism to rotate flexibly within a certain angle range. Changing the position of the limiting pin can change the rotation angle range of the lower leg mechanism, making it convenient to use.

[0026] 4. This utility model, by setting up a display screen, battery, control board, etc., when the separation shaft drives the lower leg mechanism to rotate, the first gear will drive the second gear to rotate. The second gear, in conjunction with a rotary potentiometer, is used to detect the rotation angle of the first gear, that is, to detect the rotation angle of the lower leg mechanism. The detected angle will be displayed on the display screen, so that the real-time rotation angle of the lower leg mechanism can be seen intuitively. Attached Figure Description

[0027] Figure 1 A schematic diagram of the overall structure of the joint stretching assembly;

[0028] Figure 2 A schematic diagram of the joint stretching assembly;

[0029] Figure 3 This is a schematic diagram of the internal structure of the joint stretching assembly.

[0030] Figure 4 A schematic diagram of the thigh mechanism and the lower leg mechanism;

[0031] Figure 5 This is a schematic diagram of the drive mechanism;

[0032] Figure 6 This is a structural schematic diagram of the bearing connecting block, the worm gear, the first separation shaft, and the second separation shaft;

[0033] Figure 7 This is a cross-sectional structural diagram of the bearing connecting block, worm gear, and separation shaft one and separation shaft two.

[0034] In the diagram: 1. Outer shell; 11. Arc-shaped through groove; 12. Arc-shaped guide groove; 13. Display screen; 14. Battery; 15. Control board; 16. Rotary potentiometer; 17. First gear; 18. Second gear; 2. Thigh mechanism; 21. Thigh wall; 22. Thigh support adjustment block; 3. Lower leg mechanism; 31. Lower leg wall; 32. Lower leg support adjustment block; 4. Drive mechanism; 41. First handwheel; 42. First bevel gear; 43. Worm gear; 44. Second bevel gear; 45. Bearing connecting block; 451. Limiting hole two; 46. Worm gear; 461. Toothed hole; 462. Limiting hole one; 47. Separation shaft one; 471. Ball bearing; 472. Threaded hole; 473. Round hole; 48. Second handwheel; 49. Separation shaft two; 491. Threaded part; 492. Transition part; 493. Clamping part; 410. Limiting pin. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] like Figures 1 to 4 As shown, an embodiment of this utility model provides a joint extension component, including: a housing 1, a thigh mechanism 2 disposed at one end of the housing 1, a lower leg mechanism 3 disposed at the other end of the housing 1, the lower leg mechanism 3 corresponding to the thigh mechanism 2 when not rotating; and a drive mechanism 4 disposed on the housing 1 for driving the lower leg mechanism 3 to rotate relative to the thigh mechanism 2; the drive mechanism 4 includes a drive component disposed inside the housing 1, and a first handwheel 41 rotatably passing through the side wall of the housing 1 for driving the drive component to rotate, the outer wall of the housing 1 is provided with an arc-shaped through groove 11 to facilitate the rotation of the lower leg mechanism 3, the lower leg mechanism 3 passes through the arc-shaped through groove 11 and is connected to the output shaft of the drive component inside the housing 1; wherein, the fan-shaped angle of the arc-shaped through groove 11 relative to the output shaft of the drive component can be set in the range of 0° to 150°, and the preferred angle in this embodiment is 135°. In this embodiment, the first handwheel 41 is located on the front side of the outer casing 1, and a shaft hole is provided on the outer wall of the front side of the outer casing 1 to facilitate the passage of the rod of the first handwheel 41. A bearing is installed on the inner wall of the shaft hole to cooperate with the rod of the first handwheel 41. In other embodiments of this utility model, the first handwheel 41 may also be located on the rear side of the outer casing 1 or in other positions, as long as its use does not interfere with the thigh mechanism 2 and the lower leg mechanism 3. In this embodiment, the thigh mechanism 2 and the lower leg mechanism 3 are located on the left and right sides of the outer casing 1, respectively.

[0037] In use, the thigh mechanism 2 is fixed to the user's thigh by external straps or adhesive tape with Velcro, and the calf mechanism 3 is fixed to the user's calf by external straps or adhesive tape with Velcro. Then, the first handwheel 41 is manually turned. The rotation of the first handwheel 41 will drive the drive component to rotate. The output shaft of the drive component can then passively drive the calf mechanism 3 to rotate relative to the thigh mechanism 2 and move around the arc-shaped through groove 11, so as to bend and extend the user's lower limbs. The first handwheel 41 can be turned to any angle according to the actual use situation, making the operation more convenient.

[0038] like Figures 4 to 7 As shown, the drive assembly includes a first bevel gear 42 rotatably disposed on the inner wall of the housing 1 and connected to the rod of the first handwheel 41; a second bearing is fixed to the rear inner wall of the housing 1, and the first bevel gear 42 is connected to the second bearing and fixed to the outer wall of the rod of the first handwheel 41; a worm gear 43 rotatably disposed on the inner wall of the housing 1 and corresponding to the rod of the first handwheel 41, the worm gear 43 being arranged along the length of the housing 1, and a support plate for supporting the worm gear 43 being provided on the inner wall of the housing 1, the support plate having a shaft hole, a third bearing being installed inside the shaft hole, the third bearing being connected to the worm gear 43; a second bevel gear 44 disposed on the worm gear 43 and meshing with the first bevel gear 42; a bearing connecting block 45 rotatably disposed on the inner wall of the housing 1 and located below the worm gear 43, a fourth bearing is fixed to the rear inner wall of the housing 1, and the bearing connecting block 45 is connected to the fourth bearing; and a second bevel gear 44 rotatably disposed on the bearing connecting block 45 and connected to the worm gear 43. The worm gear 46 engages with the worm wheel 46, and a separation shaft 47 is rotatably disposed on the inner wall of the housing 1 and parallel to the rod of the first handwheel 41. In this embodiment, the separation shaft 47 serves as the output shaft of the drive assembly. A mounting through hole is provided on the front side wall of the housing 1, and a bearing 5 is fixed at the corresponding position of the mounting through hole on the front inner wall of the housing 1. The separation shaft 47 is connected to the bearing 5, and the separation shaft 47 is hollow inside. The end of the separation shaft 47 is rotatably engaged with the worm wheel 46. The separation shaft 47 is rotatably engaged with the worm wheel 46 through a bearing 6. Specifically, the worm wheel 46 has a toothed hole 461 along the axial direction. The minimum inner diameter of the toothed hole 461 is larger than the outer diameter of the separation shaft 47. The bearing 6 is located on the worm wheel 46 and close to the bearing connecting block 45, and the central axis of the bearing 6 coincides with the central axis of the toothed hole 461. The separation shaft 47 is abutted against the worm wheel 46 by a locking component, and the small leg mechanism 3 passes through the arc-shaped through groove 11 and is connected to the outer wall of the separation shaft 47. One end of the locking component is located inside the separation shaft 47, and is used to clamp or separate the separation shaft 47 and the worm gear 46. The other end of the locking component extends out from the mounting through hole on the front side wall of the housing 1.

[0039] When the separating shaft 47 is engaged with the worm gear 46 via the locking component, manually turning the first handwheel 41 will drive the first bevel gear 42 to rotate. The first bevel gear 42 drives the worm 43 to rotate via the second bevel gear 44. The worm 43 drives the worm gear 46 to rotate, and the worm gear 46 drives the separating shaft 47 to rotate. Ultimately, this passively drives the lower leg mechanism 3 to rotate relative to the thigh mechanism 2, achieving bending and extension of the lower limb. When the separating shaft 47 is not engaged with the worm gear 46, the user can actively drive the lower leg mechanism 3 to rotate. The rotation of the lower leg mechanism 3 drives the separating shaft 47 to rotate, allowing the user to actively adjust the bending angle between the lower leg mechanism 3 and the thigh mechanism 2 according to their own situation. This is more suitable for patients in the middle and late stages of rehabilitation, thereby achieving effective exercise of the leg muscles.

[0040] Meanwhile, when the user actively drives the lower leg mechanism 3 to rotate a certain angle and wants to fix that angle, the locking component can be manually driven to rotate, and the separation shaft 47 and the worm gear 46 will be pressed together. At this time, the lower leg mechanism 3 is restricted from rotating and fixed at an angle, thereby effectively exercising the leg muscles.

[0041] Specifically, the locking component includes a second handwheel 48 located outside the housing 1 and on the same side as the first handwheel 41, and a second separation shaft 49 threadedly connected to the first separation shaft 47 and connected to the second handwheel 48. The side wall of the first separation shaft 47 has a through hole, and a ball bearing 471 is installed within the through hole. Here, the diameter of the through hole on the first separation shaft 47 matches the diameter of the ball bearing 471, and the maximum clearance between the toothed hole 461 and the outer wall of the first separation shaft 47 is less than the diameter of the ball bearing 471. When the outer wall of the second separation shaft 49, away from the second handwheel 48, contacts the ball bearing 471, the first separation shaft 47 abuts against the inner wall of the toothed hole 461 through the ball bearing 471. In this embodiment, at least two balls bearing 471 are provided, and the number of through holes on the first separation shaft 47 is equal to the number of balls bearing 471.

[0042] The first separation shaft 47 has a threaded hole 472 and a round hole 473 sequentially formed along the axial direction inside. The round hole 473 is located on the side near the worm gear 46, and its diameter is larger than that of the threaded hole 472. The ball bearing 471 is located on the inner wall of the round hole 473. The second separation shaft 49 includes a threaded portion 491, a transition portion 492, and a clamping portion 493 connected axially in sequence. The outer diameter of the threaded portion 491 is smaller than that of the clamping portion 493, and the outer diameter of the transition portion 492 gradually increases from the threaded portion 491 to the clamping portion 493. The end of the threaded portion 491 away from the transition portion 492 extends out of the outer casing 1 and is connected to the second handwheel 48. The threaded portion 491 is connected to the threaded hole 472. The inner diameter of the round hole 473 matches the outer diameter of the abutment portion 493. The bearing connecting block 45 is provided with a clearance groove that matches the abutment portion 493. The gap between the outer wall of the threaded portion 491 and the inner wall of the round hole 473 is smaller than the diameter of the ball 471. When the outer wall of the abutment portion 493 contacts the ball 471, the separation shaft 47 abuts against the inner wall of the toothed hole 461 through the ball 471.

[0043] When it is necessary to actively adjust the rotation angle of the lower leg mechanism 3, the second handwheel 48 is manually driven to rotate. The rotation of the second handwheel 48 drives the second separation shaft 49 to rotate, thereby causing the threaded part 491 on the second separation shaft 49 to move along the threaded hole 472 toward the bearing connecting block 45. At this time, the transition part 492 and the threaded part 491 move together. When the transition part 492 moves to the position of the ball 471, the abutting part 493 extends into the clearance groove on the bearing connecting block 45, and the ball 471 can move into the hole 473, so that the worm gear 46 and the first separation shaft 47 are not tightly abutted, thereby actively adjusting the rotation angle of the lower leg mechanism 3 relative to the thigh mechanism 2. When it is necessary to fix the rotation of the lower leg mechanism 3, the second handwheel 48 can be rotated in the opposite direction to make the threaded part 491 and the transition part 492 move in the opposite direction along the threaded hole 472. When the outer wall of the abutting part 493 contacts the ball 471, the separation shaft 47 abuts against the worm gear 46 through the ball 471, making it more flexible to use.

[0044] like Figure 2 and Figure 4As shown, an arc-shaped guide groove 12 is provided on the side wall adjacent to the second handwheel 48 of the outer casing 1. The fan-shaped angle of the arc-shaped guide groove 12 is 45° to 90°, and in this embodiment, the fan-shaped angle of the arc-shaped guide groove 12 is 90°. The central axis of the arc-shaped guide groove 12 coincides with the central axis of the separation shaft 47. The worm gear 46 is provided with a plurality of limiting holes 462 spaced in a ring along its axial direction. The bearing connecting block 45 is provided with a plurality of limiting holes 451 spaced in a ring along its axial direction, corresponding to the limiting holes 462. The drive assembly also includes a limiting pin 410. One end of the limiting pin 410 is located outside the outer casing 1, and the other end of the limiting pin 410 passes through the arc-shaped guide groove 12 and the limiting hole 462 in sequence and is inserted into the limiting hole 451. In this embodiment, the rod of the limiting pin 410 located outside the outer casing 1 is provided with a pull ring.

[0045] When the separating shaft 47 and the worm gear 46 are separated, and it is necessary to limit the rotation angle range of the lower leg mechanism 3, manually insert the limiting pin 410 through the arc-shaped guide groove 12, the limiting hole 462, and into the limiting hole 451. The user actively drives the lower leg mechanism 3 to rotate. The rotation of the lower leg mechanism 3 will drive the separating shaft 47 to rotate. At this time, the worm gear 46 does not rotate, so the limiting pin 410 does not rotate. During the rotation, the outer wall of the limiting pin 410 will limit the lower leg mechanism 3, thus limiting the rotation angle of the lower leg mechanism 3 and allowing the lower leg mechanism 3 to rotate flexibly within a certain angle range. Pulling the pull ring will remove the limiting pin 410, making the operation convenient.

[0046] like Figure 3 As shown, the thigh mechanism 2 includes a thigh wall 21 and a thigh support adjustment block 22. One end of the thigh wall 21 passes through the side wall of the outer shell 1 and is connected to its inner wall. The other end of the thigh wall 21 is slidably engaged with the thigh support adjustment block 22. The thigh support adjustment block 22 has a sliding groove along the axial direction that matches the thigh wall 21. The thigh wall 21 is locked to the thigh support adjustment block 22 by a screw. Tightening the screw makes the thigh support adjustment block 22 not press against the thigh wall 21, which can drive the thigh support adjustment block 22 to move and adjust its position. After adjustment, it is then pressed against the thigh wall by the screw. This mechanism is suitable for people with different leg lengths.

[0047] The calf mechanism 3 includes a calf wall 31 and a calf support adjustment block 32. The calf wall 31 has a Z-shaped cross-section, while the thigh support adjustment block 22 and the calf support adjustment block 32 both have L-shaped cross-sections. One end of the calf wall 31 passes through the arc-shaped groove 11 and connects to the outer wall of the separation shaft 47. The calf wall 31 has a connecting hole that matches the separation shaft 47. The calf wall 31 is fitted onto the outer wall of the separation shaft 47 and locked with screws. The other end of the calf wall 31 slides into the calf support adjustment block 32 and is locked to the calf support adjustment block 32 by a screw. The calf support adjustment block 32 corresponds to the thigh support adjustment block 22. Tightening the screw loosens the calf support adjustment block 32 from the calf wall 31, allowing the calf support adjustment block 32 to move and adjust its position. After adjustment, it is then tightened by the screw. This design is suitable for people with different leg lengths.

[0048] To facilitate intelligent control, a display screen 13 is embedded in the outer wall of the outer casing 1, and the display screen 13 and the two handwheels are located on the same side. A battery 14, a control board 15, and a rotary potentiometer 16 are respectively installed on the inner wall of the outer casing 1. The control board 15 is communicatively connected to the display screen 13, the battery 14, and the rotary potentiometer 16. The battery 14 is used to provide power to the control board 15 and the display screen 13. The battery 14 is fixed to the rear inner wall of the outer casing 1, the control board 15 is fixed to the inner bottom wall of the outer casing 1, and the rotary potentiometer 16 is installed on the front inner wall of the outer casing 1. The specific model of the rotary potentiometer 16 is RK09L1140A2U. A first gear 17 is installed on the outer wall of the separation shaft 47, and a second gear 18 that meshes with the first gear 17 is installed on the rotating shaft of the rotary potentiometer 16. The rotary potentiometer 16 and the second gear 18 cooperate to detect the rotation angle of the lower leg mechanism 3 and display the rotation angle on the display screen 13, so that the user can intuitively see the real-time rotation angle of the lower leg mechanism 3 during use. The outer wall of the outer casing 1 is provided with a switch and a charging port that are electrically connected to the battery 14; in this embodiment, the battery 14 is a storage battery, and the charging port can charge the storage battery in an instant.

[0049] When using the joint extension component of this utility model, when it is necessary to rotate the lower leg mechanism 3 to any fixed angle, the thigh brace adjustment block 22 is fixed to the user's thigh using an external strap or a Velcro strap, and the lower leg brace adjustment block 32 is fixed to the lower leg. Then, the first handwheel 41 is manually rotated. The rotation of the first handwheel 41 will drive the drive component to rotate. The output shaft of the drive component can then passively drive the lower leg mechanism 3 to rotate relative to the thigh mechanism 2, and move around the arc-shaped through groove 11, so as to achieve bending and extension of the user's lower limbs.

[0050] When it is necessary to actively adjust the rotation angle of the lower leg mechanism 3, the second handwheel 48 is manually driven to rotate. The rotation of the second handwheel 48 drives the second separation shaft 49 to rotate, thereby moving the second separation shaft 49 towards the bearing connecting block 45. When the transition part 492 moves to the position of the ball 471, the abutment part 493 extends into the clearance groove on the bearing connecting block 45, and the ball 471 can move into the circular hole 473, so that the worm gear 46 and the first separation shaft 47 are not tightly abutted, thus allowing the rotation angle of the lower leg mechanism 3 relative to the thigh mechanism 2 to be actively adjusted. When it is necessary to fix the rotation of the lower leg mechanism 3, the second handwheel 48 can be rotated in the opposite direction, causing the threaded part 491 and the transition part 492 to move in the opposite direction along the threaded hole 472. When the outer wall of the abutment part 493 contacts the ball 471, the first separation shaft 47 abuts against the worm gear 46 through the ball 471, making it more flexible to use. At the same time, the lower leg mechanism 3 can be restricted to rotate within a certain angle range by the limiting pin 410, making it more flexible and suitable for patients at different stages.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A joint stretching assembly, characterized in that, include: The outer shell (1), the thigh mechanism (2) disposed at one end of the outer shell (1), the lower leg mechanism (3) disposed at the other end of the outer shell (1), and the drive mechanism (4) disposed on the outer shell (1) for driving the lower leg mechanism (3) to rotate relative to the thigh mechanism (2). The drive mechanism (4) includes a drive assembly disposed in the housing (1) and a first handwheel (41) rotatably passing through the side wall of the housing (1) and used to drive the drive assembly to rotate. The outer wall of the housing (1) is provided with an arc-shaped through groove (11) to facilitate the rotation of the lower leg mechanism (3). The lower leg mechanism (3) passes through the arc-shaped through groove (11) and is connected to the output shaft of the drive assembly in the housing (1).

2. The joint stretching assembly according to claim 1, characterized in that, The drive assembly includes a first bevel gear (42) rotatably disposed on the inner wall of the housing (1) and connected to the rod of the first handwheel (41); a worm gear (43) rotatably disposed on the inner wall of the housing (1) and corresponding to the rod of the first handwheel (41); a second bevel gear (44) disposed on the worm gear (43) and meshing with the first bevel gear (42); and a bearing connecting block (45) rotatably disposed on the inner wall of the housing (1) and located below the worm gear (43). A worm wheel (46) is mounted on the bearing connecting block (45) and meshes with the worm (43), and a separation shaft (47) is rotatably mounted on the inner wall of the housing (1) and parallel to the rod of the first handwheel (41). The end of the separation shaft (47) is rotatably engaged with the worm wheel (46), and the separation shaft (47) is pressed against the worm wheel (46) by a locking member. The lower leg mechanism (3) passes through the arc-shaped through groove (11) and is engaged with the outer wall of the separation shaft (47).

3. The joint stretching assembly according to claim 2, characterized in that, The worm gear (46) has a toothed hole (461) along the axial direction, and the minimum inner diameter of the toothed hole (461) is greater than the outer diameter of the separation shaft (47).

4. The joint stretching assembly according to claim 3, characterized in that, The locking component includes a second handwheel (48) located outside the housing (1) and on the same side as the first handwheel (41), and a second separation shaft (49) threadedly connected to the first separation shaft (47) and connected to the second handwheel (48). The side wall of the first separation shaft (47) is provided with a through hole, and a ball bearing (471) is installed in the through hole. When the outer wall of the end of the second separation shaft (49) away from the second handwheel (48) contacts the ball (471), the first separation shaft (47) abuts against the inner wall of the toothed hole (461) through the ball (471).

5. The joint stretching assembly according to claim 4, characterized in that, The interior of the first separating shaft (47) is provided with a threaded hole (472) and a round hole (473) in sequence along the axial direction. The diameter of the round hole (473) is larger than the diameter of the threaded hole (472). The second separating shaft (49) includes a threaded part (491), a transition part (492), and a clamping part (493) connected axially in sequence. The outer diameter of the threaded part (491) is smaller than the outer diameter of the clamping part (493), and the outer diameter of the transition part (492) gradually increases from the threaded part (491) to the clamping part (493). The end of the threaded part (491) away from the transition part (492) extends out of the outer casing (1) and is connected to the second handwheel (48). The threaded part (491) is connected to the threaded hole (472). The inner diameter of the circular hole (473) matches the outer diameter of the clamping part (493). The bearing connecting block (45) is provided with a clearance groove that matches the clamping part (493). When the outer wall of the abutting part (493) contacts the ball (471), the separating shaft (47) abuts against the inner wall of the toothed hole (461) through the ball (471).

6. The joint stretching assembly according to claim 4, characterized in that, The outer casing (1) has an arc-shaped guide groove (12) on the side wall adjacent to the second handwheel (48), and the central axis of the arc-shaped guide groove (12) coincides with the central axis of the separation shaft (47). The worm gear (46) has a plurality of limiting holes (462) spaced in a ring along its axial direction. The bearing connecting block (45) has a plurality of limiting holes (451) spaced in a ring along its axial direction, which correspond to the limiting holes (462). The drive assembly also includes a limiting pin (410), one end of which is located outside the housing (1), and the other end of which passes through the arc-shaped guide groove (12), the limiting hole one (462) and is inserted into the limiting hole two (451).

7. The joint stretching assembly according to claim 6, characterized in that, The rod of the limiting pin (410) located outside the outer casing (1) is provided with a pull ring.

8. The joint stretching assembly according to claim 2, characterized in that, The thigh mechanism (2) includes a thigh wall (21) and a thigh support adjustment block (22). One end of the thigh wall (21) passes through the side wall of the outer shell (1) and is connected to its inner wall. The other end of the thigh wall (21) is slidably engaged with the thigh support adjustment block (22), and the thigh wall (21) is locked to the thigh support adjustment block (22) by a screw.

9. The joint stretching assembly according to claim 8, characterized in that, The lower leg mechanism (3) includes a lower leg wall (31) and a lower leg brace adjustment block (32). One end of the lower leg wall (31) passes through the arc-shaped through groove (11) and is connected to the outer wall of the separation shaft (47). The other end of the lower leg wall (31) is slidably engaged with the lower leg brace adjustment block (32). The lower leg wall (31) is locked to the lower leg brace adjustment block (32) by a screw. The lower leg brace adjustment block (32) corresponds to the thigh brace adjustment block (22).

10. The joint stretching assembly according to any one of claims 2 to 9, characterized in that, The outer wall of the outer casing (1) is fitted with a display screen (13), and the inner wall of the outer casing (1) is respectively provided with a battery (14), a control board (15), and a rotary potentiometer (16). The control board (15) is communicatively connected to the display screen (13), the battery (14), and the rotary potentiometer (16). The outer wall of the outer casing (1) is respectively provided with a switch and a charging port electrically connected to the battery (14). The outer wall of the separation shaft (47) is provided with a first gear (17), and the rotating shaft of the rotary potentiometer (16) is provided with a second gear (18) that meshes with the first gear (17).

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