A knee joint distraction device

Abstract

The application discloses a knee joint distraction device and relates to the field of wound traction devices, which solves the problem that the observation of the distraction position is not clear enough and the distraction area is relatively fixed, which is easy to cause tearing and discomfort when the knee joint distraction device is used, and comprises a mounting ring, a sliding frame and a distraction mechanism, wherein the distraction mechanism comprises a first distraction plate, a second distraction plate, a third distraction plate, a sliding piece and an adjusting piece. The application controls the overturning state of the first distraction plate through the adjusting piece on the distraction mechanism, and makes the first distraction plate in the distraction state sequentially link the second distraction plate and the third distraction plate to overturn to the two sides of the first distraction plate in the process of sliding distraction to the periphery, gradually increases the supporting area with the expansion of the distraction degree, improves the stability and comfort of the support, and at the same time, the first distraction plate in the non-distraction state also keeps synchronous movement and does not link the overturning of the second distraction plate and the third distraction plate, so that the field of view of the distraction position is not blocked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wound distractor, in particular to a knee joint internal distraction device. BACKGROUND

[0002] Arthroscopy is a standard orthopedic technique, doctors use arthroscopy, special minimally invasive surgical instruments, can make some surgery minimally invasive, many joints such as knee, hip, shoulder, ankle, elbow, wrist, etc. can be used arthroscopy, at present, knee arthroscopy is used most, and the indications are the most extensive. In knee arthroscopy, the lesion inside the knee joint needs to be fully exposed so that the doctor can clearly observe and operate.

[0003] The existing knee joint internal distraction device is mostly used in the way of supporting from the middle to the four sides, such as the related distraction devices disclosed in CN109464171A and CN117379124A. These structures can only play the role of supporting the wound, but at this time the doctor's field of view is also greatly blocked, the middle part of the distraction position is blocked by the device body, which seriously affects the subsequent operation of the medical staff, and is not conducive to the operation. At the same time, the area supported by these devices is relatively fixed, and it is difficult to automatically adjust the area of the supported position according to the size of the required distraction range. When a smaller area of the support plate is always used for support, the distraction range is too large, which may easily cause wound tearing or local discomfort. SUMMARY

[0004] The purpose of the present application is to provide a knee joint internal distraction device which can improve the stability during the distraction process and does not block the distraction position, so as to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a knee joint internal distraction device, comprising a mounting ring and a distraction mechanism, a plurality of groups of sliding frames are uniformly and slidably connected to the mounting ring, the distraction mechanism comprises a first distraction plate mounted on the sliding frame, two groups of second distraction plates and two groups of third distraction plates are arranged on the sliding frame, a sliding member for driving a plurality of groups of sliding frames to slide synchronously to the four sides is arranged on the mounting ring, an adjusting member for adjusting the overturning state of the first distraction plate is arranged on the sliding frame, the distraction mechanism can adjust the overturning state of the first distraction plate through the adjusting member, and the first distraction plate in the distraction state can link the second distraction plate and the third distraction plate in turn and overturn to the two sides of the first distraction plate during the distraction process of sliding to the four sides, so as to gradually increase the support area with the expansion of the distraction degree, improve the stability and comfort of the support, and improve the stability during the distraction process without blocking the distraction position.

[0006] Preferably, the expansion mechanism further comprises a sliding rod mounted on the sliding frame, a sliding groove is formed in the sliding frame and connected with the outer wall of the sliding rod in horizontal direction, one end of the sliding rod is fixedly connected with a fixed rod, the bottom of the fixed rod is fixedly connected with a rotating frame, the first expansion plate is rotatably connected with the rotating frame, and the sliding frame is provided with a control member for controlling the rotating state of the second expansion plate and the third expansion plate, so as to improve the stability and comfort of lifting support.

[0007] Preferably, the control member comprises two groups of moving frames slidably connected with the inner wall of the sliding groove in horizontal direction, one end of the moving frame is fixedly connected with a first spring fixedly connected with the sliding frame, the sliding frame is fixedly connected with two groups of fixed frames, the second expansion plate is rotatably connected with the side surface of the moving frame, the third expansion plate is rotatably connected with the side surface of the fixed frame, the moving frame and the fixed frame are respectively fixedly connected with a clock spring, one end of the second expansion plate and the third expansion plate is fixedly connected with the adjacent clock spring, and the sliding rod is provided with a rotating member for driving the second expansion plate and the third expansion plate to rotate, so as to control the rotating state of the second expansion plate and the third expansion plate.

[0008] Preferably, the rotating member comprises a sliding plate mounted on the bottom of the sliding rod, the side surface of the second expansion plate is fixedly connected with a first gear, the side surface of the third expansion plate is fixedly connected with a second gear, the side surface of the sliding rod is provided with a lifting groove, a first rack capable of meshing with the first gear is slidably connected in the lifting groove in vertical direction, the bottom surface of the first rack is fixedly connected with the top surface of the sliding plate, and the side surface of the moving frame is provided with a second rack capable of meshing with the second gear, so that the adjusting member can control the lifting state of the sliding plate while adjusting the rotating state of the first expansion plate, and the second expansion plate and the third expansion plate are driven to rotate.

[0009] Preferably, the adjusting member comprises a threaded rod rotatably connected with the top surface of the sliding plate, the threaded rod penetrates through the sliding rod and is threadedly connected with the sliding rod, the sliding plate is fixedly connected with a bending rod for pushing the first expansion plate to overturn and fold, the side surface of the moving frame is fixedly connected with a guide frame slidably guided with the outer wall of the second rack in vertical direction, the side surface of the sliding plate is provided with a guide groove, and the bottom of the second rack is fixedly connected with a guide block slidably connected with the inner wall of the guide groove in horizontal direction, so as to adjust the overturning state of the first expansion plate.

[0010] Preferably, the sliding piece comprises a second spring fixedly installed at one end of the sliding rod, the second spring is fixedly connected with the sliding groove away from the one end of the sliding rod, a third spring is fixedly connected with the inner wall of the mounting ring on the sliding frame, a rotating ring is rotatably connected on the mounting ring, and a moving piece for driving the sliding frame to move is arranged on the rotating ring, so that multiple groups of the sliding frame can be driven to slide synchronously to the periphery.

[0011] Preferably, the moving piece comprises a first pull rope fixedly installed at one end of the sliding rod, a rotating groove is formed in the bottom of the rotating ring, a driving block is fixedly connected in the rotating groove, the first pull rope penetrates through the mounting ring and is slidably connected with the inner wall of the mounting ring, the one end of the first pull rope away from the sliding rod is fixedly connected with the side surface of the driving block, and a driving piece for driving the rotating ring to rotate is arranged on the mounting ring, so that the sliding frame can be driven to move.

[0012] Preferably, the driving piece comprises a driving shaft rotatably connected with the mounting ring, a bevel gear ring is coaxially fixedly connected with the bottom of the rotating ring, a first bevel gear meshing with the bevel gear ring is coaxially fixedly connected at one end of the driving shaft, a plurality of bevel tooth blocks are uniformly fixedly connected with the outer wall of the driving shaft, a spring clamping block capable of unidirectionally clamping the bevel tooth blocks is arranged in the mounting ring, and a second pull rope is fixedly connected at one end of the spring clamping block, so that the rotating ring can be driven to rotate.

[0013] Preferably, a plurality of binding belts for fixing the mounting ring with the body of a patient are fixedly connected on the mounting ring, so that the mounting ring can be fixed with the body of the patient.

[0014] Preferably, a buffer pad is fixedly connected with the side surface of each of the first, second and third support plates, so that the damage to the support position can be reduced.

[0015] Compared with the prior art, the knee joint internal distraction device has the following beneficial effects:

[0016] The knee joint internal distraction device provided by the application solves the problems that the existing knee joint internal distraction device is not clear enough in observation of the support position during use, the support area is relatively fixed, and tearing and discomfort are prone to occur, the turning state of the first support plate is controlled by the adjusting piece on the support mechanism, and the first support plate in the support state is linked with the second and third support plates in turn to turn to the two sides of the first support plate during the sliding support to the periphery, the support area is gradually increased with the expansion of the support degree, the stability and comfort of the support are improved, and the first support plate in the non-support state also moves synchronously without turning the second and third support plates, so that the view of the support position is not blocked. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic diagram of the bottom structure of the mounting ring of the present application;

[0019] Figure 3 is a schematic diagram of the overall structure of the present application; Figure 2 is an enlarged view of area A in the middle;

[0020] Figure 4 is a schematic diagram of the partial structure of the sliding member of the present application;

[0021] Figure 5 is a schematic diagram of the overall structure of the present application; Figure 4 is an enlarged view of area B in the middle;

[0022] Figure 6 is a schematic diagram of the overall structure of the present application; Figure 4 is an enlarged view of area C in the middle;

[0023] Figure 7 is a schematic diagram of the partial structure of the opening mechanism of the present application;

[0024] Figure 8 is a schematic diagram of the structure of the first opening plate in the supporting state of the present application;

[0025] Figure 9 is a schematic diagram of the overall structure of the present application; Figure 8 is an enlarged view of area D in the middle;

[0026] Figure 10 is a schematic diagram of the structure of the first opening plate in the overturning state of the present application;

[0027] Figure 11 is a schematic diagram of the overall structure of the present application; Figure 10 is an enlarged view of area E in the middle;

[0028] Figure 12 is a partial structure sectional view of the opening mechanism of the present application.

[0029] In the figure: 1 - mounting ring; 2 - sliding frame; 3 - first opening plate; 4 - second opening plate; 5 - third opening plate; 6 - sliding rod; 7 - sliding groove; 8 - fixed rod; 9 - rotating frame; 10 - moving frame; 11 - first spring; 12 - fixed frame; 13 - clock spring; 14 - sliding plate; 15 - first gear; 16 - second gear; 17 - lifting groove; 18 - first rack; 19 - second rack; 20 - threaded rod; 21 - bent rod; 22 - guide frame; 23 - guide groove; 24 - guide block; 25 - second spring; 26 - third spring; 27 - rotating ring; 28 - first pull rope; 29 - rotating groove; 30 - driving block; 32 - driving shaft; 33 - bevel gear ring; 34 - first bevel gear; 35 - oblique tooth block; 36 - spring clamping block; 37 - second pull rope; 38 - bandage; 39 - buffer pad. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] Please refer to Figures 1-12 The present application provides a technical solution: a knee joint distraction device, comprising a mounting ring 1 and a distraction mechanism, a plurality of groups of sliding frames 2 are uniformly and slidably connected to the mounting ring 1, a plurality of groups of binding belts 38 for fixing the mounting ring 1 to the patient's body are fixedly connected to the mounting ring 1, the distraction mechanism comprises a first distraction plate 3 mounted on the sliding frame 2, two groups of second distraction plates 4 and two groups of third distraction plates 5 are arranged on the sliding frame 2, the side surfaces of the first distraction plate 3, the second distraction plate 4 and the third distraction plate 5 are fixedly connected with the buffer pads 39 respectively, the mounting ring 1 is provided with a sliding member for driving the plurality of groups of sliding frames 2 to slide synchronously to the four directions, the sliding frame 2 is provided with an adjusting member for adjusting the overturning state of the first distraction plate 3, the distraction mechanism can adjust the overturning state of the first distraction plate 3 through the adjusting member, and the first distraction plate 3 in the distraction state can link the second distraction plate 4 and the third distraction plate 5 in sequence to overturn to the two sides of the first distraction plate 3 in the process of sliding distraction to the four directions, gradually increasing the support area with the expansion of the distraction degree, and improving the stability and comfort of the support.

[0032] The distraction mechanism further comprises a sliding rod 6 mounted on the sliding frame 2, a sliding groove 7 in horizontal sliding connection with the outer wall of the sliding rod 6 is formed in the sliding frame 2, one end of the sliding rod 6 is fixedly connected with a fixed rod 8, the bottom of the fixed rod 8 is fixedly connected with a rotating frame 9, the first distraction plate 3 is in rotational connection with the rotating frame 9, and the sliding frame 2 is provided with a control member for controlling the rotational state of the second distraction plate 4 and the third distraction plate 5.

[0033] The control member comprises two groups of moving frames 10 in horizontal sliding connection with the inner walls of the sliding grooves 7, one end of the moving frame 10 is fixedly connected with a first spring 11 fixedly connected with the sliding frame 2, the sliding frame 2 is fixedly connected with two groups of fixed frames 12, the side surface of the second distraction plate 4 is in rotational connection with the moving frame 10, the side surface of the third distraction plate 5 is in rotational connection with the fixed frame 12, the moving frame 10 and the fixed frame 12 are respectively fixedly connected with a clockwork spring 13, the second distraction plate 4 and the third distraction plate 5 are respectively fixedly connected with one end of the adjacent clockwork spring 13, and the sliding rod 6 is provided with a rotating member for driving the second distraction plate 4 and the third distraction plate 5 to rotate.

[0034] The rotating member comprises a sliding plate 14 fixedly connected to the bottom of the sliding rod 6, the first gear 15 is fixedly connected to the side of the second spreading plate 4, the second gear 16 is fixedly connected to the side of the third spreading plate 5, the lifting groove 17 is arranged on the side of the sliding rod 6, the first rack 18 capable of meshing with the first gear 15 is slidably connected in the lifting groove 17 in the vertical direction, the bottom surface of the first rack 18 is fixedly connected to the top surface of the sliding plate 14, the second rack 19 capable of meshing with the second gear 16 is arranged on the side of the moving frame 10, and the adjusting member can control the lifting state of the sliding plate 14 while adjusting the rotating state of the first spreading plate 3.

[0035] The adjusting member comprises a threaded rod 20 rotatably connected to the top surface of the sliding plate 14, the threaded rod 20 penetrates through the sliding rod 6 and is threadedly connected to the sliding rod 6, the bending rod 21 for pushing the first spreading plate 3 to be folded is fixedly connected to the sliding plate 14, the guiding frame 22 slidably guided in the vertical direction with the outer wall of the second rack 19 is fixedly connected to the side of the moving frame 10, the guiding groove 23 is arranged on the side of the sliding plate 14, and the guiding block 24 slidably connected in the horizontal direction with the inner wall of the guiding groove 23 is fixedly connected to the bottom of the second rack 19.

[0036] The sliding member comprises the second spring 25 fixedly connected to one end of the sliding rod 6, the second spring 25 is fixedly connected to the sliding groove 7 away from the sliding rod 6, the third spring 26 fixedly connected to the inner wall of the mounting ring 1 is fixedly connected to the sliding frame 2, the rotating ring 27 rotatably connected to the mounting ring 1 is arranged on the mounting ring 1, and the moving member for driving the sliding frame 2 to move is arranged on the rotating ring 27.

[0037] The moving member comprises the first pull rope 28 fixedly connected to one end of the sliding rod 6, the rotating groove 29 is arranged on the bottom of the rotating ring 27, the driving block 30 is fixedly connected in the rotating groove 29, the first pull rope 28 penetrates through the mounting ring 1 and is slidably connected to the inner wall of the mounting ring 1, the side surface of the driving block 30 is fixedly connected to the end of the first pull rope 28 away from the sliding rod 6, and the driving member for driving the rotating ring 27 to rotate is arranged on the mounting ring 1.

[0038] The driving member comprises the driving shaft 32 rotatably connected to the mounting ring 1, the bevel gear ring 33 is coaxially fixedly connected to the bottom of the rotating ring 27, the first bevel gear 34 meshing with the bevel gear ring 33 is coaxially fixedly connected to one end of the driving shaft 32, a plurality of bevel tooth blocks 35 are uniformly fixedly connected to the outer wall of the driving shaft 32, the spring clamping block 36 capable of unidirectionally clamping the bevel tooth block 35 is arranged in the mounting ring 1, and the second pull rope 37 is fixedly connected to one end of the spring clamping block 36.

[0039] In this embodiment, the mounting ring 1 is fixed on the position of the patient's leg that needs to be distracted by the binding band 38, and the sliding plate 14 is lifted by rotating the threaded rod 20. When the sliding plate 14 moves downward, the first rack 18 moves downward, and the first distraction plate 3 is pushed by the bending rod 21 to rotate around the rotating frame 9 to the position close to the bottom surface of the sliding plate 14, that is, the first distraction plate 3 at this position is adjusted to the folded state. The device can flexibly adjust the number of first distraction plates 3 needed, for example, when only two first distraction plates 3 are needed to be moved and distracted on both sides, the remaining first distraction plates 3 do not need to be distracted, avoiding unnecessary distraction of the area and affecting the operation. At the same time, the sliding plate 14 drives the guide block 24 and the second rack 19 to move downward through the guide groove 23, while the sliding rod 6 that needs to be distracted does not rotate the threaded rod 20, and the bending rod 21 does not push the first distraction plate 3 to flip, so that the first distraction plate 3 at this position can remain in the same straight line with the fixed rod 8 under the drive of the rotating block spring shaft, facilitating subsequent distraction operation

[0040] Thereafter, the driving shaft 32 drives the first bevel gear 34 to rotate, the first bevel gear 34 drives the bevel gear ring 33 to rotate, so that the rotating ring 27 drives the driving block 30 to pull the first pull rope 28, the first pull rope 28 pulls one end of the sliding rod 6 to gradually compress the second spring 25. The sliding rod 6 can drive the fixed rod 8 and the first distraction plate 3 to move in the process of sliding in the sliding groove 7. A plurality of first distraction plates 3 can be driven by the first pull rope 28 to open synchronously in all directions. Due to the pushing of the third spring 26, the position of the sliding frame 2 remains stable. In the process of sliding in the sliding groove 7, only the first distraction plate 3 in the vertical state at the bottom is used to distract the required position. The positions between the plurality of first distraction plates 3 form an unobstructed observation port, which is convenient for observing and operating the distraction position.

[0041] In the process of synchronous sliding of the sliding rod 6 and the first opening plate 3, the sliding plate 14 also slides, so that the first rack 18 gradually approaches the bottom of the first gear 15. When the first opening plate 3 is in the opening state, the sliding plate 14 at this position is not pushed downward by the threaded rod 20, so that the height of the first rack 18 and the second rack 19 can just mesh with the first gear 15 and the second gear 16. When the sliding rod 6 drives the first rack 18 to pass through the first gear 15, the first gear 15 can be driven to flip 180° with the second opening plate 4. The two second opening plates 4 on both sides are flipped to the two sides of the first opening plate 3 at the same time, assisting in supporting the part to be opened, increasing the support area, and reducing the risk of tearing and discomfort. Then the sliding plate 14 continues to slide, and the second rack 19 gradually drives the second gear 16 to rotate, so that the third opening plate 5 rotates 180°, and the two third opening plates 5 on both sides are synchronized to the two sides of the second opening plate 4 for auxiliary support, again expanding the support area. Then, the sliding rod 6 continues to slide, and since the fixed rod 8 has abutted with one end of the sliding frame 2, the sliding frame 2 can be directly driven to slide and open outward, and the third spring 26 is compressed.

[0042] When the first opening plate 3 is in the flipped state, the sliding plate 14 is in the downward state, and the first rack 18 and the second rack 19 move downward relatively, so that in the process of moving the sliding rod 6, the first rack 18 and the second rack 19 cannot mesh with the first gear 15 and the second gear 16 at the corresponding position. Thus, during the entire opening process, it can be ensured that the first opening plate 3, the second opening plate 4 and the third opening plate 5 are all in the initial state and will not be flipped downward to open the wound. At the same time, it also ensures that these first opening plate 3, second opening plate 4 and third opening plate 5 can be opened synchronously, ensuring the cleaning of the observation field and avoiding affecting the operation, so that the use is more convenient and efficient.

[0043] In the process of rotating the drive shaft 32, the spring clamping block 36 will continuously one-way limit and clamp the bevel gear block 35. After opening to the required position, the drive shaft 32 is directly released to automatically limit. When the sliding frame 2 needs to be reset, the second pull rope 37 is pulled to release the clamping of the spring clamping block 36 on the bevel gear block 35. The drive shaft 32 is reversely rotated to reversely rotate the rotating ring 27, reduce the pulling force on the first pull rope 28, and drive the sliding rod 6 and the moving frame 10 to slide and reset under the combined action of the first spring 11, the second spring 25 and the third spring 26. The elastic force of the first spring 11 and the second spring 25 is much smaller than that of the third spring 26.

[0044] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0045] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A knee joint distraction device, comprising: The utility model relates to a kind of supporting mechanism of supporting ring, including: Mounting ring (1), multiple groups of sliding frame (2) are evenly connected on the mounting ring (1); Further comprising: The supporting mechanism includes the first strutting plate (3) installed on the sliding frame (2), the sliding frame (2) is equipped with two groups of second strutting plate (4) and two groups of third strutting plate (5), the mounting ring (1) is equipped with sliding element for driving multiple groups of the sliding frame (2) to carry out synchronous sliding to four around, the sliding frame (2) is equipped with adjusting element for adjusting the turnover state of the first strutting plate (3), the supporting mechanism can adjust the turnover state of the first strutting plate (3) by the adjusting element, and make the first strutting plate (3) in strutting state in the process of strutting and sliding to four around, sequentially link the second strutting plate (4) and the third strutting plate (5) to overturn to both sides of the first strutting plate (3), gradually increase support area with the expansion of strutting degree, improve the stability and comfort of support; The supporting mechanism further includes sliding rod (6) installed on the sliding frame (2), the sliding groove (7) that is slidably connected with the outer wall of the sliding rod (6) along horizontal direction is formed in the sliding frame (2), the sliding frame (2) is equipped with control element for controlling the rotating state of the second strutting plate (4) and the third strutting plate (5); The control element includes two groups of moving frame (10) slidably connected with the inner wall of the sliding groove (7) along horizontal direction, one end of the moving frame (10) is fixedly connected with the first spring (11) fixedly connected with the sliding frame (2), the sliding frame (2) is fixedly connected with two groups of fixed frame (12), the second strutting plate (4) is rotatably connected with the side surface of the moving frame (10), the third strutting plate (5) is rotatably connected with the side surface of the fixed frame (12), the moving frame (10) and the fixed frame (12) are fixedly connected with the clockwork spring (13) respectively, the second strutting plate (4) and the third strutting plate (5) are fixedly connected with one end of adjacent clockwork spring (13) respectively, the sliding rod (6) is equipped with rotating element for driving the second strutting plate (4) and the third strutting plate (5) to rotate; The rotating element includes sliding plate (14) installed on the bottom of the sliding rod (6), the side surface of the second strutting plate (4) is fixedly connected with the first gear (15), the side surface of the third strutting plate (5) is fixedly connected with the second gear (16), the side surface of the sliding rod (6) is formed with lifting groove (17), the first rack (18) that can be engaged with the first gear (15) is slidably connected in the lifting groove (17) along vertical direction, the bottom surface of the first rack (18) is fixedly connected with the top surface of the sliding plate (14), the side surface of the moving frame (10) is equipped with the second rack (19) that can be engaged with the second gear (16), the adjusting element can control the lifting state of the sliding plate (14) while adjusting the rotating state of the first strutting plate (3).

2. A knee joint distraction device according to claim 1, wherein: One end of the sliding rod (6) is fixedly connected with a fixed rod (8), the bottom of the fixed rod (8) is fixedly connected with a rotating frame (9), and the first strutting plate (3) is rotationally connected with the rotating frame (9).

3. A knee joint distraction device according to claim 1, wherein: The adjusting part comprises a threaded rod (20) rotationally connected with the top surface of the sliding plate (14), the threaded rod (20) penetrates through the sliding rod (6) and is threadedly connected with the sliding rod (6), the sliding plate (14) is fixedly connected with a bending rod (21) for pushing the first strutting plate (3) to be folded, the side surface of the moving frame (10) is fixedly connected with a guide frame (22) slidingly guided along the vertical direction of the outer wall of the second rack (19), the side surface of the sliding plate (14) is provided with a guide groove (23), and the bottom of the second rack (19) is fixedly connected with a guide block (24) slidingly connected along the horizontal direction of the inner wall of the guide groove (23).

4. The knee joint distraction device of claim 1, wherein: The sliding part comprises a second spring (25) fixedly installed at one end of the sliding rod (6), one end of the second spring (25) away from the sliding rod (6) is fixedly connected with the sliding groove (7), the sliding frame (2) is fixedly connected with a third spring (26) fixedly connected with the inner wall of the mounting ring (1), the mounting ring (1) is rotationally connected with a rotating ring (27), and the rotating ring (27) is provided with a moving part for driving the sliding rod (6) to move.

5. A knee joint distraction device according to claim 4, wherein: The moving part comprises a first pull rope (28) fixedly installed at one end of the sliding rod (6), the bottom of the rotating ring (27) is provided with a rotating groove (29), the rotating groove (29) is fixedly connected with a driving block (30) inside, the first pull rope (28) penetrates through the mounting ring (1) and is slidingly connected with the inner wall of the mounting ring (1), one end of the first pull rope (28) away from the sliding rod (6) is fixedly connected with the side surface of the driving block (30), and the mounting ring (1) is provided with a driving part for driving the rotating ring (27) to rotate.

6. A knee joint distraction device according to claim 5, wherein: The driving part comprises a driving shaft (32) rotationally connected with the mounting ring (1), the bottom of the rotating ring (27) is coaxially fixedly connected with a bevel gear ring (33), one end of the driving shaft (32) is coaxially fixedly connected with a first bevel gear (34) engaged with the bevel gear ring (33), the outer wall of the driving shaft (32) is uniformly fixedly connected with a plurality of bevel tooth blocks (35), the mounting ring (1) is provided with a spring clamping block (36) capable of unidirectionally clamping the bevel tooth blocks (35), and one end of the spring clamping block (36) is fixedly connected with a second pull rope (37).

7. The knee joint distraction device of claim 1, wherein: A plurality of binding belts (38) for fixing the mounting ring (1) and the patient's body are fixedly connected to the mounting ring (1).

8. The knee joint distraction device of claim 1, wherein: The side surfaces of the first strutting plate (3), the second strutting plate (4) and the third strutting plate (5) are respectively fixedly connected with buffer pads (39). The side surfaces of the first strutting plate (3), the second strutting plate (4) and the third strutting plate (5) are respectively fixedly connected with buffer pads (39).

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