Multifunctional fine-tuning tibial medullary cavity positioning osteotomy device

Abstract

The application relates to the field of medical devices, in particular to a multifunctional fine-adjusting tibial medullary cavity positioning and bone cutting device. The device comprises a tibial medullary cavity positioning assembly, a medullary needle block arranged on a fixing block and a medullary needle arranged at the center of the medullary needle block and used for inserting into a medullary cavity; a tibial bone cutting assembly, a tibial bone positioner, a mounting rod and a tibial bone cutting guide arranged on the mounting rod; a tibial bone varus-valgus angle adjusting assembly, a sliding block and an angle plate rotatably arranged on the fixing block; a tibial bone retroversion angle adjusting assembly, a retroversion clamping block and a retroversion adjusting block used for limiting the retroversion clamping block; wherein the sliding block and the retroversion clamping block are both arranged on the medullary needle in a sliding mode, and after adjustment, the sliding block and the retroversion clamping block are slid towards the tibia until the sliding block and the retroversion clamping block are fixed on the angle plate and the retroversion adjusting block respectively. The application has the effect of accurately adjusting the tibial bone varus-valgus angle and the retroversion angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, and in particular to a multifunctional fine adjustment tibial medullary canal positioning osteotomy device. BACKGROUND

[0002] Knee replacement is a surgical method for relieving knee pain, correcting knee deformity, and improving knee function and quality of life by using artificial prosthesis. Tibial osteotomy is an indispensable key step in knee replacement. Currently, the commonly used method in surgery is extramedullary positioning osteotomy, which generally consists of a tibial osteotomy plate, an extramedullary force line rod, a force line adjusting rod, and a knee holder. There is also a tibial intramedullary positioning osteotomy device, which is currently less common on the operating table.

[0003] For the existing extramedullary positioning, multiple verifications are required to ensure that the extramedullary positioner can accurately position the medullary cavity of the human body (i.e., the anatomical axis of the tibia). The procedure is complicated, time-consuming, and labor-intensive, and even then it is not easy to accurately locate the medullary cavity. When using extramedullary osteotomy for tibial osteotomy, the varus-valgus angle cannot be accurately adjusted. Although the varus-valgus angle is marked on the knee holder, the overall height needs to be adjusted during the actual operation process, causing the bottom angle scale to be inaccurate in actual use. Similarly, when tibial osteotomy is performed, the posterior tilt angle cannot be accurately determined. The knee holder has a posterior tilt angle marked on it, but the height of the extramedullary force line positioner needs to be adjusted during the actual operation process, causing the posterior tilt angle scale to be inaccurate in actual use.

[0004] As for the existing tibial medullary canal positioning osteotomy device, it can only achieve tibial medullary canal positioning and cannot adjust the varus-valgus angle. However, in total knee replacement, the varus-valgus angle needs to be corrected according to the actual situation of the patient to restore the force line. Therefore, the surgeon often needs to adjust the tibial varus-valgus angle according to the patient's bone condition to cut the appropriate tibial plane. The current tibial medullary canal positioning osteotomy device also cannot adjust the posterior tilt angle, which needs to be adjusted according to the respective situation of the knee replacement product. For example, if the tibial platform pad does not have a 3-degree posterior tilt angle, the tibial osteotomy surface needs to be cut to a 3-degree posterior tilt plane. Whether the stand on the tibial platform support is vertical also affects the tibial osteotomy surface. Generally, the tibial osteotomy surface is cut to a 3-degree posterior tilt plane.

[0005] In view of the above related technologies, the inventors believe that in the process of surgery, the prior art has the defect that the varus-valgus angle and the posterior tilt angle of the tibia cannot be accurately adjusted. SUMMARY

[0006] In order to achieve the effect of accurately adjusting the varus-valgus angle and the posterior tilt angle of the tibia, the present application provides a multifunctional fine adjustment tibial medullary canal positioning osteotomy device.

[0007] The present application provides a multifunctional fine-tuning tibial medullary cavity positioning osteotomy device, which adopts the following technical solutions:

[0008] Multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device, including:

[0009] The tibial medullary cavity positioning assembly includes a fixing block abutting against the end of the tibia away from the ankle, a medullary needle block installed on the fixing block, and a medullary needle installed at the center of the medullary needle block for insertion into the medullary cavity;

[0010] A tibial osteotomy assembly, a tibial positioner, a mounting rod fixed to a side of the tibial positioner facing the tibia, and a tibial osteotomy guide sleeved on the mounting rod;

[0011] A tibial varus and varus angle adjustment assembly comprises a slider disposed on a side of the medullary needle block away from the tibia and sleeved on the medullary needle, and an angle plate rotatably mounted on the fixing block and having a circumferential surface in contact with the slider, wherein the slider and the angle plate are in contact at different angles to adjust the varus and varus angles of the tibial osteotomy guide;

[0012] The tibial tilt angle adjustment assembly includes a tilt block disposed above the fixing block and fitted with the fixing block, and a tilt adjustment block used in conjunction with the tilt block and mounted on the fixing block for limiting the tilt block, wherein the tilt adjustment block is provided with an angle scale, and the tilt block and the tilt adjustment block are fitted at different positions with the angle scale to adjust the tilt angle of the tibial osteotomy guide;

[0013] The slider and the tilt block are both slidably arranged on the medullary needle. After sliding the slider and the tilt block in a direction away from the tibia, the varus and valgus angles and the tilt angles are adjusted. The slider and the tilt block are slid in a direction close to the tibia until they are respectively fitted and fixed to the angle plate and the tilt adjustment block.

[0014] By adopting the above technical solution, during the operation, it is necessary to first open a hole above the tibial medullary cavity, then assemble the entire medullary cavity positioning osteotomy device, insert the medullary needle into the medullary cavity, lift the slider sliding on the medullary needle in the direction away from the tibia, and swing the medullary cavity locator left and right to adjust the varus and varus angles. The angle plate can reflect the specific angles of varus and varus. After adjusting the angle, release the slider, and fix the adjusted varus and varus angles after the slider and the angle plate fit together; lift the posterior tilt block sliding on the medullary needle in the direction away from the tibia, tilt the tibial osteotomy guide backward to drive the posterior tilt adjustment block on the medullary cavity locator to adjust the posterior tilt angle of the tibial osteotomy surface. The angle scale on the posterior tilt adjustment block can reflect the angle of the posterior tilt angle. After adjustment, lower the posterior tilt block so that the posterior tilt block fits with the posterior tilt adjustment block, which can lock the posterior tilt angle of the tibial cross section and adjust the tibial osteotomy plate to the appropriate osteotomy position through the mounting rod, thereby achieving the effect of accurately adjusting the tibial varus and varus angles, posterior tilt angles and osteotomy position, and performing more accurate tibial osteotomy.

[0015] Preferably, a first positioning block is provided on an end face of the sliding block close to the angle plate, and a plurality of first positioning grooves are uniformly provided on the circumference of the angle plate according to angles, and the first positioning block is clamped in the first positioning groove corresponding to one of the angles.

[0016] By adopting the above technical solution, after adjusting the inward and outward turning angles, the first positioning block is snapped into the corresponding first positioning groove according to the required angle, thereby achieving the effect of fixing after the angle is adjusted.

[0017] Preferably, the angle plate is a symmetrical structure, the angle bisector of the angle plate is a zero mark line, and the angle ranges on both sides of the zero mark line are both 0-11 degrees.

[0018] By adopting the above technical solution, the scale on the front view angle plate reflects the specific angle of inside-out and outside-out. The angle of inside-out and outside-out is generally ±10° to meet clinical needs, so the angle range of the angle plate can fully meet clinical needs and is more convenient for precise adjustment.

[0019] Preferably, the tilt block includes a base fitted with the fixed block, and a positioning rod provided on the side of the base away from the tibia, a second positioning block is provided at the end of the positioning rod away from the base, and the tilt adjustment block includes a rotating part and a movable part, and a plurality of second positioning grooves are uniformly provided on the end face of the rotating part away from the movable part at an angle, and the positioning block is clamped in the second positioning groove corresponding to one of the angles.

[0020] By adopting the above technical solution, after adjusting the castor angle, the castor block is lifted in the direction away from the tibia. At this time, the base also leaves the fixed block, and the positioning block moves in the direction away from the tibia. While rotating the rotating part, the moving part will move according to the rotation angle of the rotating part. After adjustment, the castor block is released, so that the positioning block is clamped in the second positioning groove corresponding to the adjusted angle, thereby achieving the fixation of the castor angle.

[0021] Preferably, the second positioning groove near one end of the rotating part is a zero mark, and the angle range of the rotating part is 0-8°.

[0022] By adopting the above technical solution, the angle of the tilt angle can be easily adjusted and fixed during surgery, and the scale of the rotating part can fully meet clinical needs.

[0023] Preferably, the tibial locator has a clearance opening at one end facing the fixing block, the fixing block is located in the clearance opening, the movable portion is slidably arranged on the tibial locator, and the mounting rod is arranged on the side away from the clearance opening.

[0024] By adopting the above technical solution, the setting of the clearance port can reduce the volume of the device, which is more space-saving and convenient when performing osteotomy surgery. When the rotating part rotates, the moving part slides a corresponding distance on the tibial locator according to the rotation angle of the rotating part, which is convenient for operation.

[0025] Preferably, a rearward tilt stopper is provided at one end of the base close to the mounting rod and extending toward a side away from the tibia, and a rearward tilt stopper is provided at a position of the fixing block corresponding to the rearward tilt stopper and directly above the rearward tilt stopper.

[0026] By adopting the above technical solution, when the posterior tilt block is lifted to the side away from the tibia, the posterior tilt block blocks the distance that the posterior tilt baffle moves away from the tibia, so that the movement of the posterior tilt block is controlled within the distance range between the posterior tilt block and the posterior tilt baffle, avoiding wasting time due to excessive movement distance, and also facilitating quick operation during the operation.

[0027] Preferably, a reinforcement plate is provided on the outer wall of the end of the sliding block away from the tibia.

[0028] By adopting the above technical solution, the reinforcing plate acts as a handle, making it easy to move the slider away from the tibia during surgery to avoid slipping out of the hand.

[0029] Preferably, a handle is provided at one end of the medullary needle away from the tibia.

[0030] By adopting the above technical solution, the handle facilitates the insertion of the medullary needle into the medullary cavity, making the insertion of the medullary needle into the medullary cavity more stable.

[0031] Preferably, the tibial osteotomy guide is provided with a wrench for fixing the tibial osteotomy guide on the mounting rod.

[0032] By adopting the above technical solution, the tibial osteotomy guide can be adjusted up and down by a distance of 2 mm on the mounting rod according to surgical requirements. After the position of the tibial osteotomy guide is adjusted, the tibial osteotomy guide is fixed to the mounting rod with a wrench to facilitate osteotomy.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. During the operation, it is necessary to first open a hole above the tibial medullary cavity, then assemble the entire medullary cavity positioning osteotomy device, insert the medullary needle into the medullary cavity, lift the slider sliding on the medullary needle away from the tibia, and swing the medullary cavity locator left and right to adjust the varus and varus angles. The angle plate can reflect the specific angle of varus and varus. After adjusting the angle, release the slider, and fix the adjusted varus and varus angles by fitting the slider and the angle plate together. Lift the tilt block sliding on the medullary needle away from the tibia, tilt the tibial osteotomy guide backward to drive the tilt adjustment block on the medullary cavity locator to adjust the tilt angle of the tibial osteotomy surface. The angle scale on the tilt adjustment block can reflect the tilt angle. After adjustment, lower the tilt block so that the tilt block fits with the tilt adjustment block, which can lock the tilt angle of the tibial section and adjust the tibial osteotomy plate to the appropriate osteotomy position through the mounting rod, so as to achieve the effect of accurately adjusting the tibial varus and varus angles, tilt angles and osteotomy position, and perform more accurate tibial osteotomy.

[0035] 2. The scale on the front view angle plate reflects the specific angle of inside-out and inside-out. Generally, the angle of inside-out and inside-out of ±10° can meet clinical needs. Therefore, the angle range of the angle plate can fully meet clinical needs and is more convenient for precise adjustment.

[0036] 3. After adjusting the caster angle, lift the caster block away from the tibia. At this time, the base also leaves the fixed block, and the positioning block moves away from the tibia. While rotating the rotating part, the moving part will move according to the rotation angle of the rotating part. After adjustment, release the caster block so that the positioning block is engaged in the second positioning slot corresponding to the adjusted angle, thereby fixing the caster angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the overall structure of a multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to an embodiment of the present application;

[0038] Figure 2 It is a front view structural diagram embodying the present application;

[0039] Figure 3It is a left-side structural schematic diagram embodying the present application;

[0040] Figure 4 It is a partial enlarged schematic diagram of part A.

[0041] Explanation of the accompanying reference numerals: 1. tibial medullary cavity positioning assembly; 11. fixing block; 111. fixing seat; 112. fixing plate; 12. medullary needle block; 121. square block; 122. cylindrical block; 13. medullary needle; 131. handle; 2. tibial osteotomy assembly; 21. tibial positioner; 211. clearance port; 22. mounting rod; 23. tibial osteotomy guide; 231. wrench; 3. tibial varus and varus angle adjustment assembly; 31. slider; 311. first positioning block; 312. reinforcement plate; 32. angle plate; 321. first positioning slot; 4. tibial tilt angle adjustment assembly; 41. tilt block; 411. base; 412. positioning rod; 413. second positioning block; 42. tilt adjustment block; 421. rotating portion; 422. moving portion; 423. second positioning slot; 43. tilt baffle; 44. tilt baffle. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-4 This application is described in further detail.

[0043] The embodiment of the present application discloses a multifunctional fine-tuning tibial medullary cavity positioning osteotomy device. Figure 1 and Figure 2 The tibial medullary cavity positioning and osteotomy device includes a tibial medullary cavity positioning assembly 1 for positioning during surgery, a tibial osteotomy assembly 2 for performing osteotomy, a tibial varus angle adjustment assembly 3 for adjusting the varus angle during surgery, and a tibial posterior tilt angle adjustment assembly 4 for adjusting the posterior tilt angle during surgery. The tibial medullary cavity positioning assembly 1 includes a fixing block 11 that abuts the end of the tibia away from the ankle, a medullary needle block 12 mounted on the fixing block 11, and a medullary needle 13 disposed at the center of the medullary needle block 12 for insertion into the medullary cavity.

[0044] Reference Figure 1, the fixed block 11 includes a fixed seat 111 and a fixed plate 112 vertically fixed with the fixed seat 111, the fixed seat 111 is square, a square port is arranged at the center of the fixed seat 111, and the marrow needle block 12 is arranged in the square port. The marrow needle block 12 includes a square block 121 and a cylindrical block 122, the center lines of the square block 121 and the cylindrical block 122 coincide, the square block 121 is arranged on the side close to the tibia, the cylindrical block 122 is vertically fixed at the center of the side of the square block 121 away from the tibia, and the square block 121 is rotationally connected with the fixed seat 111. The fixed plate 112 is provided with two, the two fixed plates 112 are symmetrically arranged, and the two fixed plates 112 are vertically fixed on the opposite outer walls of the fixed seat 111 respectively, the two fixed plates 112 are flush with the side of the fixed seat 111 facing the tibia at one end, one side of the square block 121 is arranged in abutment with one of the fixed plates 112, and the end of the fixed plate 112 away from the tibia is chamfered.

[0045] With reference to Figure 1 and Figure 3 , a marrow needle 13 port is arranged at the center of the marrow needle block 12 according to the diameter size of the marrow needle 13, in use, the marrow needle 13 is inserted into the tibia which is pre-punched after passing through the marrow needle 13 port, and the end of the marrow needle block 12 close to the tibia is arranged as a curved surface, facilitating rotation and installation. One end of the marrow needle 13 is provided with a handle 131, the marrow needle 13 is vertically fixed at the center of the length direction of the handle 131 in a T-shaped structure, a plurality of recesses are arranged on the handle 131 for convenient holding during use, and in the process of surgery, the handle 131 is located at the end away from the tibia, and the handle 131 facilitates insertion of the marrow needle 13 into the marrow cavity, so that the process of inserting the marrow needle 13 into the marrow cavity is more stable.

[0046] With reference to Figure 1 and Figure 3 , the tibial varus angle adjusting assembly 3 includes a sliding block 31 arranged on the side of the cylindrical block 122 away from the square block 121 and an angle plate 32 rotationally installed on the side of the square block 121 away from the fixed plate 112, the sliding block 31 and the angle plate 32 are arranged in abutment with the peripheral surface, the sliding block 31 is sleeved on the marrow needle 13 and is slidingly arranged, the end of the sliding block 31 close to the angle plate 32 is provided with a first positioning block 311, the first positioning block 311 is triangular, a plurality of first positioning grooves 321 are uniformly arranged on the peripheral surface of the angle plate 32 according to the angle, and after the varus angle is adjusted, the first positioning block 311 is clamped in the corresponding first positioning groove 321 according to the required angle, so that the function of fixing after adjusting the angle is achieved.

[0047] With reference to Figure 2, the angle plate 32 is fan-shaped symmetric structure, the center of the angle plate 32 is rotationally connected with the square block 121, the fixed plate 112 near the side of the angle plate 32 is provided with a limiting column, the limiting column is arranged on the side of the fixed plate 112 near the angle plate 32 and the range is adapted to the range of the angle plate 32, the angle bisector of the angle plate 32 is zero scale line, the angle range on both sides of the zero scale line is 0-11°, the scale on the angle plate 32 in the front view reflects the specific angle of the varus and valgus, the angle of the varus and valgus is generally ±10°, which can meet the clinical requirements, so the angle range of the angle plate 32 can fully meet the clinical requirements and is more convenient for accurate adjustment. The slider 31 is fixedly connected with the reinforcing plate 312 at the end away from the cylindrical block 122, the reinforcing plate 312 plays the role of the handle 131, which is convenient for moving the slider 31 away from the tibia during the operation, so as to avoid hand slipping.

[0048] With reference to Figure 1 and Figure 3 , the tibial inclination angle adjusting assembly 4 comprises a rear inclination block 41 arranged above the fixed block 11 and attached with the fixed block 11, and a rear inclination adjusting block 42 installed on the fixed block 11 and used for limiting the rear inclination block 41. The rear inclination block 41 comprises a base 411 attached with the side of the fixed block 11 away from the tibia, and a positioning rod 412 fixedly connected with the base 411 and perpendicular to the base 411, and the positioning rod 412 is provided with a second positioning block 413 at the end away from the base 411. The rear inclination adjusting block 42 comprises a rotating part 421 and a moving part 422, and the rotating part 421 is rotationally installed on the side of the fixed block 11 adjacent to the angle plate 32.

[0049] With reference to Figure 3 and Figure 4The rotating part 421 is arranged perpendicular to the moving part 422, and the rotating part 421 and the moving part 422 are integrally formed. A plurality of second positioning grooves 423 are uniformly provided on the end surface of the rotating part 421 away from one end of the moving part 422 at an angle. The second positioning groove 423 near one end of the rotating part 421 is a zero mark. The angle range of the rotating part 421 is 0-8°. After adjusting the castor angle, the castor block 41 is lifted in the direction away from the tibia. At this time, the base 411 also leaves the fixed block 11, and the positioning block moves in the direction away from the tibia. While rotating the rotating part 421, the moving part 422 will move according to the rotation angle of the rotating part 421. After adjustment, the castor block 41 is released so that the positioning block is clamped in the second positioning groove 423 corresponding to the adjusted angle, thereby achieving fixation of the castor angle. The scale of the rotating part 421 can fully meet clinical needs. A tilting baffle 43 is provided on the side of the base 411 extending away from the tibia, and a tilting baffle 43 is provided on the fixed block 11 corresponding to the position of the tilting baffle 43 and directly above the tilting baffle 43. When the tilting block 41 is lifted toward the side away from the tibia, the tilting baffle 44 blocks the distance that the tilting baffle 43 moves away from the tibia, so that the movement of the tilting block 41 is controlled within the distance range between the tilting baffle 44 and the tilting baffle 43, avoiding wasting time due to excessive movement distance, and also facilitating quick operation during the operation.

[0050] Reference Figure 1 The tibial osteotomy assembly 2 includes a tibial locator 21, a mounting rod 22 fixed to the side of the tibial locator 21 facing the tibia, and a tibial osteotomy guide 23 mounted on the mounting rod 22. The tibial locator 21 has a clearance opening 211 at one end facing the fixed block 11, and the fixed block 11 is located within the clearance opening 211. A movable portion 422 is slidably mounted on the tibial locator 21, and the mounting rod 22 is positioned on a side facing away from the clearance opening 211. The mounting rod 22 is vertically fixed to the tibial locator 21. The provision of the clearance opening 211 can reduce the size of the device, saving space and being more convenient during osteotomy surgery. When the rotating portion 421 rotates, the movable portion 422 slides on the tibial locator 21 a corresponding distance according to the rotation angle of the rotating portion 421, facilitating operation. Two tibial osteotomy guides 23 are provided, corresponding to the left and right tibias of the human body, respectively. The two tibial osteotomy guides 23 are symmetrical in structure and can be replaced according to the actual situation of the surgery. The tibial osteotomy guide 23 is also provided with a wrench 231 for fixing the tibial osteotomy guide 23 on the mounting rod 22. The tibial osteotomy guide 23 can be adjusted up and down by a distance of 2 mm on the mounting rod 22 according to surgical requirements. After the position of the tibial osteotomy guide 23 is adjusted, the tibial osteotomy guide 23 is fixed to the mounting rod 22 by the handle 131 to facilitate osteotomy.

[0051] The implementation principle of the embodiment of the present application is as follows: during the operation, a hole for installing the medullary needle 13 is first opened in the tibia, the medullary needle 13 is inserted into the medullary cavity through the medullary needle block 12, the slider 31 is lifted in the direction away from the tibia, the varus and varus angles are adjusted, the slider 31 is loosened so that the first positioning block 311 is engaged in the first positioning groove 321, and the adjusted varus and varus angles can be fixed, the tilt block 41 is lifted in the direction away from the tibia, the tilt angle is adjusted, the tilt block 41 is loosened so that the second positioning block 413 is engaged in the second positioning groove 423, and the adjusted tilt angle can be fixed, the position of the tibial osteotomy guide 23 on the mounting rod 22 is adjusted, and the tibial osteotomy guide 23 is fixed to the mounting rod 22 by the wrench 231 to facilitate osteotomy.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A multifunctional fine-tuning tibial medullary cavity positioning osteotomy device, characterized in that: include: A tibial medullary cavity positioning assembly (1) comprises a fixing block (11) abutting against an end of the tibia away from the ankle, a medullary needle block (12) mounted on the fixing block (11), and a medullary needle (13) mounted at the center of the medullary needle block (12) for insertion into the medullary cavity, wherein the medullary needle block (12) is rotatably connected to the fixing block (11); A tibial osteotomy assembly (2), a tibial positioner (21), a mounting rod (22) fixed to a side of the tibial positioner (21) facing the tibia, and a tibial osteotomy guide (23) sleeved on the mounting rod (22); A tibial varus and varus angle adjustment assembly (3) comprises a slider (31) arranged on a side of the medullary needle block (12) away from the tibia and sleeved on the medullary needle (13), and an angle plate (32) rotatably mounted on the fixing block (11) and having a circumferential surface fitted with the slider (31), wherein the slider (31) and the angle plate (32) are fitted at different angles to adjust the varus and varus angles of the tibial osteotomy guide (23); A tibial tilt angle adjustment assembly (4) comprises a tilt block (41) arranged above the fixing block (11) and fitted with the fixing block (11), and a tilt adjustment block (42) used in conjunction with the tilt block (41) and mounted on the fixing block (11) for limiting the tilt block (41), wherein the tilt adjustment block (42) is provided with an angle scale, and the tilt block (41) and the tilt adjustment block (42) are fitted at different positions with the angle scale to adjust the tilt angle of the tibial osteotomy guide (23); The slider (31) and the tilt block (41) are both slidably arranged on the medullary needle (13), and the slider (31) and the tilt block (41) are slid in a direction away from the tibia to adjust the varus and valgus angles and the tilt angles, and the slider (31) and the tilt block (41) are slid in a direction close to the tibia until they are respectively fixed to the angle plate (32) and the tilt adjustment block (42); The tilt block (41) includes a base (411) fitted with the fixed block (11), and a positioning rod (412) arranged on a side of the base (411) away from the tibia, and a second positioning block (413) is provided at one end of the positioning rod (412) away from the base (411). The tilt adjustment block (42) includes a rotating part (421) and a moving part (422). A plurality of second positioning grooves (423) are uniformly provided at an angle on the end surface of the rotating part (421) away from the moving part (422), and the positioning block is clamped in the second positioning groove (423) corresponding to one of the angles. The tibial locator (21) is provided with a clearance opening (211) at one end facing the fixing block (11), and the fixing block (11) is located in the clearance opening (211). The rotating portion (421) is rotatably mounted on a surface of the fixing block (11) adjacent to the angle plate (32) mounted thereon, and the moving portion (422) is slidably mounted on the tibial locator (21), and the mounting rod (22) is arranged on a side facing away from the clearance opening (211).

2. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: A first positioning block (311) is provided on an end surface of the slider (31) close to the angle plate (32), and a plurality of first positioning grooves (321) are evenly arranged on a circumference of the angle plate (32) according to angles. The first positioning block (311) is clamped in the first positioning groove (321) corresponding to one of the angles.

3. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 2, characterized in that: The angle plate (32) has a symmetrical structure, the angle bisector of the angle plate (32) is a zero mark line, and the angle ranges on both sides of the zero mark line are both 0-11 degrees.

4. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: The second positioning groove (423) near one end of the rotating portion (421) is a zero mark, and the angle range of the rotating portion (421) is 0-8°.

5. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: A rearward tilting baffle (43) is provided on one end of the base (411) close to the mounting rod (22) and extending toward a side away from the tibia, and a rearward tilting baffle (44) is provided on the fixing block (11) at a position corresponding to the rearward tilting baffle (43) and directly above the rearward tilting baffle (43).

6. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: A reinforcing plate (312) is provided on the outer wall of one end of the sliding block (31) away from the tibia.

7. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: A handle (131) is provided at one end of the medullary needle (13) away from the tibia.

8. The multifunctional fine-adjustable tibial medullary cavity positioning osteotomy device according to claim 1, characterized in that: The tibial osteotomy guide (23) is provided with a wrench (231) for fixing the tibial osteotomy guide (23) on the mounting rod (22).

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