Osteotomy auxiliary device for extramedullary positioning of tibia

Abstract

The utility model belongs to the field of tibia osteotomy auxiliary devices, and discloses an osteotomy auxiliary device for tibia extramedullary positioning, which comprises a main body, a clamping seat, a connecting seat, a first end cap, a screw rod and a second end cap, the connecting seat is connected with the main body, the first end cap, the screw rod and the second end cap are sequentially and coaxially connected, a pair of clamping arms is hinged on the clamping seat, and the screw rod is arranged between the clamping seat and the connecting seat and meshed with the clamping seat; the clamping seat is in sliding fit with the connecting seat, the connecting seat is clamped between the first end cap and the second end cap, the first end cap is provided with a plurality of acting parts, the connecting seat is provided with an elastic deformation movable assembly, and the movable assembly is clamped between the adjacent acting parts. According to the scheme, when the main body support on the ankle holding assembly is moved, moving distance feedback can be generated, an operator can accurately perceive the real moving distance of the main body support, the operator is prevented from being disturbed by external factors such as vibration and noise, and the working efficiency is improved. The moving precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of tibial osteotomy auxiliary devices, and in particular to an extramedullary tibial osteotomy auxiliary device. Background Technology

[0002] The lower limb alignment is the biomechanical axis of the lower limbs, formed by the arrangement of the lower limb bones and the alignment of the joints. It passes through the centers of the hip, knee, and ankle joints in sequence, ensuring the stability of the lower limbs in terms of weight-bearing and movement. If the lower limb alignment is incorrect, it may lead to problems such as joint wear and tear, pain, and arthritis. In severe cases, it may even affect the ability to walk and move. Therefore, whenever a lower limb joint replacement surgery is performed, it is necessary to correct the lower limb alignment. This is especially important when the knee joint is replaced with an artificial knee joint due to severe wear, damage, or pathological conditions. Correcting the lower limb alignment can effectively prevent derivative problems, relieve knee pain, improve knee function, correct knee deformities, and ensure long-term stable knee movement.

[0003] An artificial knee joint mainly consists of three parts arranged in sequence: the femoral condyle prosthesis, the tibial plateau prosthesis, and the tibial plateau prosthesis. The femoral condyle prosthesis is fixed to the lower end of the femur, while the tibial plateau prosthesis is fixed to the upper end of the tibia. Before the tibial plateau prosthesis is fixed to the upper end of the femur, the upper end of the tibia needs to be cut flat so that the tibial plateau prosthesis can be installed with the upper end surface of the tibia as the installation reference, and can present the required installation posture on the upper end surface of the tibia.

[0004] When performing a resection of the proximal tibia, an extramedullary osteotomy device for tibial positioning is often used for assistance. Existing extramedullary osteotomy devices for tibial positioning mainly consist of three modules connected sequentially: a connecting component for connecting the osteotomy guide, a main support, and an ankle-holding component for clamping the tibia at the ankle. Using the tibia at the ankle as a positioning base, a long-distance positioning is achieved from the lower end of the tibia to the upper end to match the ankle and knee joints, thereby forming a correct lower limb alignment. The main support and the ankle-holding component are often connected by a movable connection, allowing the main support to adjust its relative position to the ankle-holding component by moving relative to it while the ankle is clamped, thus adjusting the connecting component to the desired position. Currently... The main support frame and the ankle clamp assembly are usually connected by a guide rail and a tightening bolt. When adjusting the main support frame, the tightening bolt on the main support frame is loosened, and then the main support frame is moved along the guide rail on the ankle clamp assembly. After the main support frame has moved, the tightening bolt is tightened again, and the main support frame and the ankle clamp assembly are fixed to the guide rail by the tightening bolt. During the above movement process, the movement distance of the main support frame is entirely controlled by the operator's feeling. The main support frame cannot provide feedback on the movement distance, making it impossible for the operator to accurately control the movement distance of the main support frame. In addition, the operator is very susceptible to interference from external factors such as vibration and noise during operation, which affects the accuracy of the movement of the main support frame. The controllability and practicality of the main support frame still need to be improved. Utility Model Content

[0005] The purpose of this invention is to provide an extramedullary osteotomy assistive device for tibial osteotomy, which generates movement distance feedback when the main support on the moving ankle-holding assembly is moved, so that the operator can accurately perceive the actual movement distance of the main support, avoid interference from external factors such as vibration and noise, improve movement accuracy, and enhance controllability and practicality in actual use.

[0006] The technical solution provided by this utility model is: an osteotomy auxiliary device for extramedullary positioning of the tibia, comprising a main body for connecting an osteotomy guide and an ankle-holding assembly disposed on the main body. The ankle-holding assembly includes a clamping seat and a connecting seat connected to the main body. A pair of clamping arms for holding the ankle are hinged on the clamping seat. The ankle-holding assembly also includes a first end cap, a lead screw, and a second end cap connected coaxially in sequence. The lead screw is disposed between the clamping seat and the connecting seat and engages with the clamping seat. The clamping seat slides along the axial direction of the lead screw with the connecting seat. The connecting seat is engaged between the first end cap and the second end cap. The first end cap is surrounded by a plurality of spaced-apart functional parts. The connecting seat is provided with an elastically deformable movable component. The movable component is engaged between adjacent functional parts. When the first end cap is twisted, the functional parts are used to compress the movable component to elastically deform and disengage it from between adjacent functional parts.

[0007] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, the first end cap has a plurality of recesses arranged at intervals around the axis of the lead screw, and the working part is formed between adjacent recesses; the movable component abuts against any of the recesses.

[0008] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, the movable component includes a damping spring built into the connecting seat and a ball bearing abutting one end of the damping spring, the ball bearing being sandwiched between adjacent actuating parts.

[0009] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, the connecting seat has a guide hole facing the opening of the first end cap, one side of the ball and the damping spring are both disposed in the guide hole, and the other end of the damping spring abuts against the bottom of the guide hole.

[0010] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, a cleaning groove communicating with the guide hole is provided on the side of the connecting seat, and the cleaning groove extends along the axial direction of the guide hole.

[0011] In the above-mentioned extramedullary tibial osteotomy assistive device, the main body includes a connecting assembly for connecting the osteotomy guide and a column disposed between the connecting seat and the connecting assembly. The column is connected to the connecting seat. The connecting assembly is provided with a swing rod hinged to the column. The column is provided with a guide strip extending along the swing direction of the swing rod. The swing rod is connected to the guide strip in an adjustable manner along the extension direction of the guide strip. The swing rod, the guide strip and the column together form a triangular structure.

[0012] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, a clamping block that can be elastically opened and closed is provided on one side of the swing arm, and the guide strip is clamped between the clamping block and the swing arm.

[0013] In the above-mentioned extramedullary osteotomy assist device for tibial osteotomy, the middle part of the clamping block is hinged to the swing rod, a compression spring is provided on one side of the hinge fulcrum of the clamping block, the compression spring abuts against the clamping block and the swing rod respectively, and the guide strip is clamped between the opposite side of the hinge fulcrum of the clamping block and the swing rod.

[0014] In the above-mentioned extramedullary osteotomy assistive device for tibial osteotomy, the column is a tubular structure, and a height adjustment block is connected to the column. The height adjustment block is provided with a first button and a first adjustment spring. The first button passes through one side of the height adjustment block, and the first adjustment spring abuts against the inner side of the height adjustment block. The column is provided with a first rack that passes through the height adjustment block. The first rack is connected to the connecting seat. The first rack and the first adjustment spring clamp the first button, and the first button and the first rack are engaged in a separable manner.

[0015] In the above-mentioned extramedullary osteotomy assistive device for tibial osteotomy, a horizontal adjustment block is provided on the column, and a second button and a second adjustment spring are provided inside the horizontal adjustment block. The second button passes through one side of the horizontal adjustment block, and the second adjustment spring abuts against the inner side of the horizontal adjustment block and the second button. A second rack passes through the second button on the horizontal adjustment block and is connected to the connecting seat. The second button is sandwiched between the second rack and the second adjustment spring, and the second button and the second rack are engaged in a separable manner.

[0016] The beneficial effects of this utility model after adopting the above technical solution are as follows:

[0017] The ankle-holding assembly in this technical solution mainly consists of three major components: a connecting seat, a lead screw, and a clamp. The lead screw has a first end cap and a second end cap at its two ends. The first end cap has several spaced-apart action parts arranged around it. The connecting seat and the clamp slide together and are engaged between the first and second end caps. The connecting seat uses a movable component capable of elastic deformation to engage between adjacent action parts, so that the first end cap is relatively fixed to the connecting seat circumferentially without external force torsion. The lead screw is coaxially connected to the first end cap, thus fixing it circumferentially to the connecting seat, meaning the lead screw stops rotating on the connecting seat. The clamp engages with the lead screw via a thread. Because the lead screw stops rotating on the connecting seat, the clamp, through the self-locking effect of the thread engagement with the lead screw, is locked to the connecting seat axially along the lead screw, meaning the connecting seat and the clamp are relatively fixed. Whenever the first end cap is twisted, the movable component becomes the resistance to the movement of the two action parts along the circumference of the first end cap. At this time, the relative resistance between the movable component and the action parts is the greatest. The action parts on the first end cap press the movable component until the movable component is fully elastically deformed. The movable component disengages from the two adjacent action parts. At this time, the relative resistance decreases rapidly and it falls into the next adjacent action part. The alternating change of relative resistance forms the feedback sensing effect of torsional damping. At this time, the lead screw is also driven by the first end cap. Through the lead screw transmission, it drives the clamp to slide relative to the connecting seat along the axis of the lead screw. This realizes the feedback of the movement distance when the main support on the moving ankle assembly is moved. This allows the operator to accurately perceive the real movement distance of the main support, avoids interference from external factors such as vibration and noise, improves the movement accuracy, and enhances the controllability and practicality in actual use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the tibial extramedullary osteotomy assist device for embodiment 1 of this utility model;

[0019] Figure 2 This is an exploded view of the ankle-holding assembly of Embodiment 1 of this utility model;

[0020] Figure 3 This is a partial cross-sectional view of the main body of Embodiment 1 of this utility model;

[0021] Figure 4 This is the utility model Figure 3 A magnified view of part A.

[0022] Reference numerals: 1. Ankle-holding assembly; 2. Main body;

[0023] 11. First end cap; 12. Clamp; 13. Second end cap; 14. Connecting seat; 15. Lead screw; 16. Movable component;

[0024] 111. Torsion spring; 112. Swing arm; 113. First graduation; 121. Actuating part; 122. Concave point;

[0025] 141. Pointer; 142. Cleaning tank; 143. Slot; 144. Guide hole; 161. Ball bearing; 162. Damping spring;

[0026] 21. Second rack; 22. Horizontal adjustment block; 221. Second button; 222. Second adjusting spring;

[0027] 23. Guide bar; 231. Guide groove; 232. Second graduation;

[0028] 24. First rack; 25. Height adjustment block; 251. First button; 252. First adjusting spring;

[0029] 26. Rocker arm; 261. Clamping block; 2611. Positioning protrusion; 262. Compression spring;

[0030] 27. Column; 28. Connecting component. Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on this utility model.

[0032] Example 1:

[0033] like Figure 1-4 As shown, the extramedullary osteotomy assistive device for tibial osteotomy includes a main body 2 for connecting an osteotomy guide and an ankle-holding assembly 1 disposed on the main body 2. The ankle-holding assembly 1 includes a clamping seat 12 and a connecting seat 14 connected to the main body 2. A pair of clamping arms for holding the ankle are hinged on the clamping seat 12. The ankle-holding assembly 1 further includes a first end cap 11, a lead screw 15 and a second end cap 13 connected coaxially in sequence. The lead screw 15 is disposed between the clamping seat 12 and the connecting seat 14 and engages with the clamping seat 12. The clamping seat 12 slides along the axial direction of the lead screw 15 with the connecting seat 14. The connecting seat 14 is engaged between the first end cap 11 and the second end cap 13. The first end cap 11 is surrounded by a plurality of spaced-apart action parts 121. The connecting seat 14 is provided with an elastically deformable movable component 16. The movable component 16 is engaged between adjacent action parts 121. When the first end cap 11 is twisted, the action parts 121 are used to compress the movable component 16 to elastically deform until it disengages from between adjacent action parts 121.

[0034] The specific working principle is as follows: the ankle-holding assembly 1 is mainly composed of three main components: a connecting seat 14, a lead screw 15, and a clamping seat 12. The lead screw 15 has a first end cap 11 and a second end cap 13 at its two ends, respectively. The first end cap 11 is surrounded by several spaced-apart action parts 121. The connecting seat 14 slides with the clamping seat 12 and is engaged between the first end cap 11 and the second end cap 13. The connecting seat 14 uses a movable component 16 that can elastically deform to engage between two adjacent action parts 121, so that the first end cap 11 is free from external... Under torsional force, the screw 15 is fixed relative to the connecting seat 14 along its circumference, i.e., locked relative to the connecting seat 14. The lead screw 15 is coaxially connected to the first end cap 11, and thus the lead screw 15 is also fixed relative to the connecting seat 14 in its circumferential direction, meaning the lead screw 15 stops rotating on the connecting seat 14. The clamp 12 engages with the lead screw 15 via threads. Because the lead screw 15 stops rotating on the connecting seat 14, the clamp 12, through the self-locking effect of its threaded engagement with the lead screw 15, is locked axially to the connecting seat 14. The connecting seat 14 and the clamping seat 12 are fixed relative to each other. Whenever the first end cap 11 is twisted, the movable component 16 becomes the resistance to the movement of the two action parts 121 along the circumference of the first end cap 11. At this time, the relative resistance between the movable component 16 and the action parts 121 is the greatest. The action parts 121 on the first end cap 11 press the movable component 16 until the movable component 16 is completely elastically deformed. The movable component 16 is dislodged from the two adjacent action parts 121. At this time, the relative resistance decreases rapidly and falls into the next adjacent action part 121. The alternating change of relative resistance forms the feedback sensing effect of torsional damping. At this time, the lead screw 15 is also driven by the first end cap 11. Through the transmission of the lead screw 15, the clamping seat 12 slides relative to the connecting seat 14 along the axial direction of the lead screw 15. This realizes the feedback of the movement distance when the main body 2 bracket on the moving ankle assembly 1 is moved, so that the operator can accurately perceive the real movement distance of the main body 2 bracket, avoid the operator being disturbed by external factors such as vibration and noise, improve the movement accuracy, and enhance the controllability and practicality in actual use.

[0035] like Figure 2 As shown, preferably, the first end cap 11 has a plurality of recesses 122 arranged at intervals around the axis of the lead screw 15, and an action part 121 is formed between adjacent recesses 122; the movable component 16 abuts against any recess 122.

[0036] A recess 122 is formed on the end face of the first end cap 11. The recess 122 forms a region with a height difference with the end face of the first end cap 11 based on itself. The movable component 16 extends into this region, so that whenever the first end cap 11 is rotated, the movable component 16 obstructs the action part 121 on the first end cap 11 and forms a relative resistance. This resistance continues until the movable component 16 is fully elastically deformed. After the movable component 16 is fully elastically deformed, it disengages from the adjacent action part 121, and the relative resistance decreases rapidly. The change in relative resistance produces a torsional damping sensation.

[0037] In this embodiment, a region with a height difference is constructed on the end face of the first end cap 11. In addition to setting a concave point 122 on the end face of the first end cap 11, a protrusion can also be set on the end face of the first end cap 11. This embodiment does not impose too many restrictions on this.

[0038] like Figure 2 As shown, the specific structure of the movable component 16 is as follows: the movable component 16 includes a damping spring 162 built into the connecting seat 14 and a ball bearing 161 abutting one end of the damping spring 162. The ball bearing 161 is sandwiched between adjacent actuating parts 121.

[0039] In practical applications, the damping spring 162 presses against the ball 161, pushing the ball 161 between adjacent action parts 121. The ball 161 hinders the movement of the action part 121, thereby applying relative resistance to the rotation of the first end cap 11. When the torque of the first end cap 11 continues to increase to the preset torque, the action part 121 pushes the ball 161 backward and compresses the damping spring 162, causing the ball 161 to disengage between the two adjacent action parts 121. The relative force between the ball 161 and the action part 121 also decreases rapidly, thereby generating a damping sensation of the first end cap 11 twisting.

[0040] In a specific implementation, the ball 161 is pressed against any recess 122 so that the ball 161 is engaged between adjacent functional parts 121.

[0041] Combination Figure 1 and Figure 2 As shown, in the specific assembly, the connecting seat 14 has a guide hole 144 that opens toward the first end cap 11. One side of the ball 161 and the damping spring 162 are both located in the guide hole 114, and the other end of the damping spring 162 abuts against the bottom of the guide hole 144.

[0042] The guide hole 144 serves to guide the extension and retraction of the damping spring 162 and guide the ball 161 to reciprocate along the axial direction of the damping spring 162. In practical applications, one side of the ball 161 is located in the guide hole 144 and abuts against the damping spring 162, while the other side of the ball 161 is engaged between adjacent working parts 121. Specifically, the other side of the ball 161 abuts against the recess 122. The first end cap 11 and the damping spring 162 are clamped in the spring to prevent the ball 161 from being misaligned or falling off the first end cap 11.

[0043] As a further improvement, a cleaning groove 142 communicating with the guide hole 114 is provided on the side of the connecting seat 14, and the cleaning groove 142 extends along the axial direction of the guide hole 144.

[0044] In practical applications, the surgical procedure generates small foreign objects such as bone fragments and tissue debris. These small foreign objects tend to accumulate at the port of the guide hole 144 and become stuck between the ball bearing 161 and the inner surface of the guide hole 144, affecting the smoothness of the reciprocating movement of the ball bearing 161 on the first end cap 11 and within the guide hole 144, and also continuously causing wear on the ball bearing 161. When the small foreign objects are cleaned by flushing, they are squeezed deeper into the guide hole 144, thus affecting the extension and contraction of the damping spring 162, and making it difficult to remove the small foreign objects from the guide hole 144. To address this issue, this embodiment incorporates a cleaning tank 142. The cleaning tank 142 connects the side of the guide hole 144 to the outside of the connecting seat 14. During the flushing and cleaning of small foreign objects, the cleaning tank 142 guides out the cleaning fluid and small foreign objects, preventing them from remaining in the guide hole 144. Furthermore, the operator can use the cleaning tank 142 to observe whether the damping spring 162 and ball bearing 161 inside the guide hole 144 are damaged or worn, and whether the guide hole 144 is blocked. This allows any problems with the moving component 16 to be detected immediately, preventing delays in use.

[0045] In some embodiments, the cleaning tank 142 may be spaced apart from the port and bottom of the guide hole 144, or it may be located at the port and bottom of the guide hole 144 respectively. This embodiment does not impose too many restrictions on this.

[0046] In some embodiments, the movable component 16 may also use a pawl and a tensioner to replace the ball 161 and the damping spring 162. In specific applications, the pawl is hinged to the connecting seat 14 and locked between adjacent actuating parts 121. The tensioner is connected to the pawl and the connecting seat 14 respectively. The tensioner can be a spring or a cylinder. When the tensioner is a cylinder, it is hinged to the pawl and the connecting seat 14 respectively.

[0047] Combination Figure 1 and Figure 2As shown, preferably, the clamp 12 is provided with a first scale 113, and the connecting seat 14 is provided with a pointer 141 for pointing to the first scale 113.

[0048] In specific implementation, slots 143 extending along the axial direction of the lead screw 15 are provided on both sides of the connecting seat 14. The clamp 12 is engaged in the two slots 143 and slides with the two slots 143. The lead screw 15 is located between the two slots 143.

[0049] Combination Figure 1 , Figure 3 and Figure 4 As shown, the specific structure of the main body 2 is as follows: the main body 2 includes a connecting assembly 28 for connecting the osteotomy guide and a column 27 disposed between the connecting seat 14 and the connecting assembly 28. The column 27 is connected to the connecting seat 14. The connecting assembly 28 is provided with a swing rod 26 hinged to the column 27. The column 27 is provided with a guide strip 23 extending along the swing direction of the swing rod 26. The swing rod 26 is connected to the guide strip 23 in an adjustable manner along the extension direction of the guide strip 23. The swing rod 26, the guide strip 23 and the column 27 together form a triangular structure.

[0050] The triangular structure formed by the swing arm 26, guide bar 23, and column 27 connected end to end provides structural stability to the main body 2. Whenever the swing arm 26 swings to a preset angle on the column 27, it only needs to be connected to the guide bar 23 on the column 27 to fix the swing arm 26 to the column 27, thus avoiding the impact of the swing arm 26's angular accuracy and connection stability on the assembly gap or relative wear of the hinge fulcrum.

[0051] The connection between the swing arm 26 and the guide bar 23 is as follows: a clamping block 261 that can be elastically opened and closed is provided on one side of the swing arm 26, and the guide bar 23 is clamped between the clamping block 261 and the swing arm 26.

[0052] like Figure 4 As shown, the clamping block 261 is specifically configured on the swing rod 26 such that the middle part of the clamping block 261 is hinged to the swing rod 26, and a compression spring 262 is provided on one side of the hinge fulcrum of the clamping block 261. The compression spring 262 abuts against the clamping block 261 and the swing rod 26 respectively. A guide strip 23 is clamped between the clamping block 261 and the swing rod 26 on the opposite side of the hinge fulcrum.

[0053] In a specific embodiment, a guide groove 231 is provided on the guide bar 23. The guide groove 231 extends along the axis of the guide bar 23. The swing rod 26 is inserted into the guide groove 231 and swings along the axis of the guide groove 231 to drive the connecting component 28 on the swing rod 26 to tilt forward or backward. When the swing needs to be fixed on the guide bar 23, the clamping block 261 and the swing rod 26 are clamped together on the inner side of the guide groove 231 and the outer surface of the guide bar 23.

[0054] Preferably, there are two clamping blocks 261, which are symmetrically arranged on opposite sides of the swing arm 26. Correspondingly, there are also two compression springs 262, which correspond one-to-one with the two clamping blocks 261. Each of the two compression springs 262 abuts against the swing arm 26 and the corresponding clamping block 261.

[0055] Preferably, the guide strip 23 extends in an arc shape.

[0056] Preferably, a second scale 232 is provided on the outer surface of the guide strip 23.

[0057] Another preferred embodiment is that the second scale 232 has a groove structure, and the clamping block 261 is provided with a positioning protrusion 2611 that is engaged in the second scale 232.

[0058] like Figure 4 As shown, this embodiment is further improved. The column 27 is a tubular structure, and a height adjustment block 25 is connected to the column 27. The height adjustment block 25 is provided with a first button 251 and a first adjustment spring 252. The first button 251 passes through one side of the height adjustment block 25, and the first adjustment spring 252 abuts between the first button 251 and the inner side of the height adjustment block 25. The column 27 is provided with a first rack 24 that passes through the height adjustment block 25. The first rack 24 is connected to the connecting seat 14. The first rack 24 and the first adjustment spring 252 clamp the first button 251. The first button 251 and the first rack 24 are engaged in a separable manner.

[0059] In the specific configuration, the first button 251 is provided with a first strip hole extending along the axial direction of the first adjusting spring 252. The inner side of one end of the first strip hole adjacent to the first adjusting spring 252 is provided with a first tooth. The teeth of the first rack 24 are aligned with and engaged with the first tooth. When the first adjusting spring 252 is compressed, the first tooth separates from the teeth of the first rack 24.

[0060] like Figure 4 As shown, in another improvement of this embodiment, a horizontal adjustment block 22 is provided on the column 27. A second button 221 and a second adjustment spring 222 are provided inside the horizontal adjustment block 22. The second button 221 passes through one side of the horizontal adjustment block 22, and the second adjustment spring 222 abuts against the inner side of the second button 221 and the horizontal adjustment block 22. A second rack 21 is provided on the horizontal adjustment block 22, passing through the second button 221. The second rack 21 passes through the horizontal adjustment block 22 and is connected to the connecting seat 14. The second rack 21 and the second adjustment spring 222 clamp the second button 221, and the second button 221 and the second rack 21 are engaged in a separable manner.

[0061] Similarly, the second button 221 is provided with a second strip-shaped hole extending along the axial direction of the second adjusting spring 222. A second tooth is provided on the inner side of one end of the second strip-shaped hole adjacent to the second adjusting spring 222. The teeth of the second rack 21 are aligned with and engaged with the second tooth. When the second adjusting spring 222 is compressed, the first tooth separates from the teeth of the first rack 24.

[0062] Combination Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the first rack 24 is no longer directly connected to the connecting seat 14, but is connected to the horizontal adjustment block 22, so that the height adjustment block 25 is adjusted based on the horizontal adjustment block 22, so as to achieve the purpose of coordinated adjustment between the height adjustment block 25 and the horizontal adjustment block 22, thereby obtaining more degrees of adjustment freedom.

[0063] like Figure 4 As shown, preferably, the first adjusting spring 252 and the second adjusting spring 222 are wave springs.

[0064] Combination Figure 1 and Figure 2 A pair of clamping arms are mirror images of each other and have the same structure. The specific structure of a single clamping arm is as follows: the clamping arm includes a swing arm 112 hinged to the clamping seat 12 and a torsion spring 111 disposed between the swing arm 112 and the clamping seat 12. The torsion spring 111 is used to compress the swing arm 112 to swing toward the adjacent swing arm 112.

[0065] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An osteotomy assist device for tibial extramedullary positioning, comprising a main body for connecting an osteotomy guide and a leg-holding assembly provided on the main body, the leg-holding assembly comprising a clamping seat and a connecting seat connected with the main body, a pair of clamping arms for clamping an ankle being hinged on the clamping seat, characterized in that, The ankle-holding assembly further comprises a first end cap, a screw rod and a second end cap connected coaxially in sequence, the screw rod is arranged between the clamping seat and the connecting seat and engaged with the clamping seat, the clamping seat is in sliding fit with the connecting seat along the axial direction of the screw rod, the connecting seat is clamped between the first end cap and the second end cap, a plurality of action portions are arranged on the first end cap in a spaced manner, the connecting seat is provided with an elastic deformation movable assembly, the movable assembly is clamped between adjacent action portions, and the action portions are used for pressing the elastic deformation movable assembly to be deformed out of adjacent action portions when the first end cap is twisted.

2. The tibial diaphyseal cut assist device of claim 1, wherein, A plurality of concave points are arranged on the first end cap in a spaced manner around the axial center of the screw rod, and the action portions are formed between adjacent concave points.

3. The tibial diaphyseal cut assist device of claim 1 wherein, The movable assembly comprises a damping spring arranged in the connecting seat and a ball abutting against one end of the damping spring, and the ball is clamped between adjacent action portions.

4. The tibial diaphyseal cut assist device of claim 3, wherein, The connecting seat is provided with a guide hole opening towards the first end cap, one side of the ball and the damping spring are arranged in the guide hole, and the opposite end of the damping spring abuts against the bottom of the guide hole.

5. The tibial diaphyseal cut assist device of claim 4, wherein, A cleaning groove is arranged on the side surface of the connecting seat in communication with the guide hole, and the cleaning groove extends along the axial direction of the guide hole.

6. The tibial extramedullary osteotomy assist device according to any of claims 1-5, wherein, The main body comprises a connecting assembly for connecting an osteotomy guide and a stand arranged between the connecting seat and the connecting assembly, the stand is connected to the connecting seat, the connecting assembly is provided with a swing rod hinged to the stand, the stand is provided with a guide strip extending along the swinging direction of the swing rod, the swing rod is connected to the guide strip in an adjustable manner along the extension direction of the guide strip, and the swing rod, the guide strip and the stand jointly form a triangular structure.

7. The tibial diaphyseal cut assist device of claim 6, wherein, One side of the swing rod is provided with an elastic clamping block, and the guide strip is clamped between the clamping block and the swing rod.

8. The tibial diaphyseal cut assist device of claim 7, wherein, The middle part of the clamping block is hinged to the swing rod, one side of the hinged fulcrum of the clamping block is provided with a compression spring, the compression spring abuts against the clamping block and the swing rod respectively, and the opposite side of the hinged fulcrum of the clamping block is clamped with the guide strip and the swing rod.

9. The tibial diaphyseal cut assist device of claim 6, wherein, The stand is in a tubular structure, the stand is communicated with a height adjusting block, the height adjusting block is provided with a first button and a first adjusting spring, the first button penetrates one side of the height adjusting block, the first adjusting spring abuts between the first button and the inner side surface of the height adjusting block, the stand is provided with a first rack penetrating the height adjusting block, the first rack is connected to the connecting seat, the first rack is clamped with the first adjusting spring and the first button, and the first button and the first rack are engaged in a separable manner.

10. The tibial diaphyseal cut assist device of claim 6, wherein, The column is provided with a horizontal adjusting block, the second button and the second adjusting spring are arranged in the horizontal adjusting block, the second button penetrates one side of the horizontal adjusting block, the second adjusting spring is abutted between the second button and the inner side surface of the horizontal adjusting block, the horizontal adjusting is provided with the second rack penetrating the second button, the second rack penetrates the horizontal adjusting block and is connected to the connecting seat, the second rack and the second adjusting spring sandwich the second button, and the second button and the second rack are engaged in a separable mode.

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