Extramedullary positioning device for distal femur osteotomy in knee joint replacement

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an extramedullary positioning device for distal femur osteotomy in knee joint replacement, one end of a horizontal rod is sleeved on an adjusting handle, and a first locking mechanism is used for locking the position of the horizontal rod; the bottom of the adjusting handle is backwards connected with a lower plug and at least one upper plug; a first sliding groove is formed in the positioning seat, the positioning seat is horizontally and slidably connected with the horizontal rod through the first sliding groove, the adjusting seat and the angle adjusting mechanism are rotatably connected to the upper portion of the positioning seat, the angle adjusting mechanism can drive the adjusting seat to rotate synchronously when rotating, and the adjusting seat is backwards provided with an inserting rod. And the adjusting seat is slidably connected with a knife rest through an inserting rod. After accurate positioning, a horizontal plane positioning point at the far end of the femur can be determined through the lower plug, and the lower plug and the upper plug are matched to be jointly inserted into the outer end of the femur and do not need to go deep into the femur, so that damage to the interior of a medullary cavity is avoided, the intraoperative and postoperative bleeding amount is reduced, and the risk of postoperative infection is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and particularly relates to an extramedullary positioning device for distal femoral osteotomy in knee replacement. Background Art

[0002] Total knee replacement has been widely used in clinical practice and is an important treatment for knee osteoarthritis. Currently, in total knee replacement surgery both domestically and internationally, the distal femoral osteotomy uses the intramedullary positioning method, that is, an opening is made at a specific anatomical point at the distal femur, and the positioning rod is inserted into the bone, that is, into the medullary cavity. This method is mature, but the operation destroys the original internal environment of the femoral medullary cavity. In addition, the opening of the medullary cavity leads to a certain amount of bleeding and an increased risk of infection. Utility Model Content

[0003] In view of the above problems, the utility model provides an extramedullary positioning device for distal femoral osteotomy in knee replacement.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An extramedullary positioning device for distal femoral osteotomy in knee replacement comprises an adjustment handle, a horizontal rod, a first locking mechanism, a positioning seat, an adjustment seat, a tool holder, and an angle adjustment mechanism; one end of the horizontal rod is sleeved on the adjustment handle and can slide up and down along the adjustment handle; the first locking mechanism is used to lock the position of the horizontal rod;

[0006] The bottom of the adjustment handle is connected to a lower plug and an upper plug backward, and the upper plug is longer than the lower plug;

[0007] The positioning seat is provided with a first slide groove, and the positioning seat is horizontally slidably connected with the horizontal rod through the first slide groove. Two positioning plates are arranged downwardly on the positioning seat, and the two positioning plates are located on the left and right sides of the horizontal rod;

[0008] The adjustment seat and the angle adjustment mechanism are rotatably connected to the upper part of the positioning seat. The rotation of the angle adjustment mechanism can drive the adjustment seat to rotate synchronously. The positioning seat is also provided with a second locking mechanism for locking the rotation angle of the angle adjustment mechanism.

[0009] The adjustment seat is configured with an insertion rod backwards, the adjustment seat is slidably connected to the tool holder via the insertion rod, and a third locking mechanism for fixing the position of the tool holder is arranged on the adjustment seat.

[0010] Furthermore, the angle adjustment mechanism includes an outward-turning angle adjustment plate, which is rotatably connected to the positioning seat through a first rotating shaft, the front end of the outward-turning angle adjustment plate is an arc-shaped surface, and a zero-scale groove is constructed in the middle of the arc-shaped surface, and at least two angle adjustment grooves are constructed on both sides of the zero-scale groove in sequence, and the angle between the zero-scale groove and the outermost angle adjustment groove is 2 to 11°; the bottom of the adjustment seat is plugged into the upper part of the positioning seat through a second rotating shaft, and a toggle rod is arranged downwardly at the bottom of the adjustment seat, and the toggle rod is located in front of the second rotating shaft, and a toggle groove is constructed at the rear end of the outward-turning angle adjustment plate, and the toggle rod is inserted into the toggle groove.

[0011] Furthermore, the second locking mechanism is located at the front side of the outward-turning angle adjustment plate, and the second locking mechanism includes a sliding block, a sliding rod, and a first spring. A second sliding groove is constructed corresponding to the sliding block on the positioning seat, and the sliding rod and the first spring are arranged in the second sliding groove. The lower part of the sliding block is slidably connected to the sliding rod, and the upper part of the sliding block is connected rearward with a positioning tip. The sliding block can drive the positioning tip to insert into or out of the zero scale groove and the angle adjustment groove, and the first spring can squeeze the sliding block so that the positioning tip is inserted into the zero scale groove and the angle adjustment groove.

[0012] Furthermore, the horizontal rod includes a positioning rod, a sliding sleeve is connected to the front end of the positioning rod, the sliding sleeve is sleeved on the adjusting handle and can slide up and down along the adjusting handle, the first locking mechanism is arranged between the sliding sleeve and the adjusting handle, the first locking mechanism includes a pull-out rod, the sliding sleeve is slidably connected to the pull-out rod, the front end of the pull-out rod is connected to the pull handle, the rear end of the pull-out rod is inserted into the sliding sleeve and is connected to a locking block, the rear end of the locking block is structured with a latch tooth, the adjusting handle is structured with a vertical groove, a plurality of latch grooves for inserting the latch teeth are structured in the vertical groove, a second spring is arranged between the locking block and the sliding sleeve, the second spring can squeeze the locking block so that the latch teeth are inserted into the latch grooves.

[0013] Furthermore, the number of the angle adjustment slots on both sides is 11 or 5;

[0014] There are 11 angle adjustment slots on both sides, and the 11 angle adjustment slots correspond to integers in the range of 1 to 11 degrees respectively;

[0015] There are five angle adjustment slots on both sides, and the five angle adjustment slots correspond to 3°, 5°, 7°, 9°, and 11° respectively.

[0016] Furthermore, the front part of the tool holder is provided with at least two vertically penetrating blades, and the rear part of the tool holder is symmetrically constructed with two reference pinholes, and the front and rear of one side of the reference pinhole are respectively constructed with a front pinhole and a rear pinhole, and the front-to-back spacing between the center of the reference pinhole and the adjacent front pinhole or rear pinhole is 1mm or 2mm; the spacing between adjacent front pinholes or rear pinholes is 1mm or 2mm; wherein the horizontal spacing between the two reference pinholes, between the left front pinhole and the corresponding front pinhole on the right, and between the left rear pinhole and the corresponding rear pinhole on the right are all equal.

[0017] Furthermore, the third locking mechanism includes a pressing plate, which is rotatably connected to the upper part of the adjustment seat through a horizontally arranged third rotating shaft. The bottom of the pressing plate is connected to the adjustment seat through a third spring. A protrusion is arranged downward at the rear end of the pressing plate, and a plurality of grooves are arranged on the tool holder corresponding to the protrusion. The protrusion can cooperate with the groove to fix and adjust the position of the tool holder.

[0018] Furthermore, oblique needle holes are provided on the left and right sides of the tool holder.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The utility model provides an extramedullary positioning device for distal femoral osteotomy in knee replacement, which can determine the positioning point of the distal femoral horizontal plane through a lower plug after accurate positioning, and cooperate with an upper plug to insert the outer end of the femur, without deep penetration of the femur, thus avoiding damage to the inside of the medullary cavity, reducing intraoperative and postoperative bleeding, and reducing the risk of postoperative infection; the horizontal rod can be moved up and down along the adjusting handle and then locked, and the distance between the horizontal rod and the bone surface can be adjusted to meet the needs of different individual patients; the angle adjustment mechanism can drive the adjusting seat to rotate and lock, so as to achieve the purpose of adjusting the valgus angle of the tool holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the horizontal rod in the utility model;

[0023] Figure 3 It is a structural schematic diagram of the adjustment handle in the utility model;

[0024] Figure 4 It is another structural schematic diagram of the adjustment handle in the utility model;

[0025] Figure 5 It is a structural schematic diagram of the sliding sleeve in the utility model;

[0026] Figure 6 It is a structural schematic diagram of the positioning seat in the utility model;

[0027] Figure 7 It is a structural schematic diagram of the sliding block in the utility model;

[0028] Figure 8 It is a structural schematic diagram of the adjustment seat in the utility model;

[0029] Fig. 9 This is a schematic diagram of the structure of the tool holder in the utility model;

[0030] Fig.10 This is a schematic diagram of the structure of the outward turning angle adjustment piece in the utility model;

[0031] Fig.11 It is another structural schematic diagram of the outward turning angle adjustment piece in the utility model;

[0032] Fig.12 For this utility model Figure 6 A partial enlarged view of the middle circle A;

[0033] In the figure: adjusting handle 1, lower plug 101, upper plug 102, vertical slot 103, card slot 104, horizontal rod 2, first locking mechanism 3, positioning seat 4, first slide slot 401, adjusting seat 5, plug rod 501, second rotating shaft 502, toggle rod 503, knife holder 6, knife edge 601, reference pinhole 602, front pinhole 603, rear pinhole 604, groove 605, oblique pinhole 606, angle adjustment mechanism 7, positioning plate 8, second locking mechanism 9, The third locking mechanism 10, the eversion angle adjustment plate 11, the first rotating shaft 1101, the zero scale groove 1102, the angle adjustment groove 1103, the toggle groove 1104, the sliding block 12, the positioning tip 1201, the sliding rod 13, the first spring 14, the positioning rod 15, the sliding sleeve 16, the pulling rod 17, the handle 18, the locking block 19, the latch tooth 1901, the second spring 20, the pressing plate 21, the protrusion 2101, the third rotating shaft 22, and the third spring 23. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0035] like Figures 1 to 12 As shown, an extramedullary positioning device for distal femoral osteotomy in knee replacement includes an adjusting handle 1, a horizontal rod 2, a first locking mechanism 3, a positioning seat 4, an adjusting seat 5, a tool holder 6, and an angle adjustment mechanism 7; one end of the horizontal rod 2 is sleeved on the adjusting handle 1 and can slide up and down along the adjusting handle 1, and the first locking mechanism 3 is used to lock the position of the horizontal rod 2;

[0036] The bottom of the adjustment handle 1 is connected to a lower plug 101 and an upper plug 102 backwards, and the upper plug 102 is longer than the lower plug 101;

[0037] The horizontal rod 2 includes a positioning rod 15, and a sliding sleeve 16 is connected to the front end of the positioning rod 15. The sliding sleeve 16 is sleeved on the adjusting handle 1 and can slide up and down along the adjusting handle 1. The first locking mechanism 3 is arranged between the sliding sleeve 16 and the adjusting handle 1. The first locking mechanism 3 includes a pull-out rod 17. The sliding sleeve 16 is slidably connected to the pull-out rod 17. The front end of the pull-out rod 17 is connected to a pull handle 18. The rear end of the pull-out rod 17 penetrates into the sliding sleeve 16 and is connected to a locking block 19. The rear end of the locking block 19 is structured with a latch tooth 1901. The adjusting handle 1 is structured with a vertical groove 103, and a plurality of latch grooves 104 are structured in the vertical groove 103 for inserting the latch tooth 1901. A second spring 20 is arranged between the locking block 19 and the sliding sleeve 16. The second spring 20 can squeeze the locking block 19 so that the latch tooth 1901 is inserted into the latch groove 104.

[0038] The positioning seat 4 is configured with a first slide groove 401, and the positioning seat 4 is horizontally slidably connected with the horizontal rod 2 through the first slide groove 401. The positioning seat 4 is provided with two positioning plates 8 downward, and the two positioning plates 8 are located on the left and right sides of the horizontal rod 2;

[0039] The adjustment seat 5 and the angle adjustment mechanism 7 are rotatably connected to the upper part of the positioning seat 4. The rotation of the angle adjustment mechanism 7 can drive the adjustment seat 5 to rotate synchronously. The positioning seat 4 is also provided with a second locking mechanism 9 for locking the rotation angle of the angle adjustment mechanism 7. The adjustment seat 5 is constructed with an insertion rod 501 backward. The adjustment seat 5 is slidably connected to the tool holder 6 through the insertion rod 501. The adjustment seat 5 is provided with a third locking mechanism 10 for fixing the position of the tool holder 6.

[0040] The front of the knife holder 6 is provided with at least two vertically penetrating blades 601, and the rear of the knife holder 6 is symmetrically configured with two reference pinholes 602, and the front and rear of one side of the reference pinhole 602 are respectively configured with a front pinhole 603 and a rear pinhole 604, and the front and rear spacing between the center of the reference pinhole 602 and the adjacent front pinhole 603 or rear pinhole 604 is 1mm or 2mm; the spacing between adjacent front pinholes 603 or rear pinholes 604 is 1mm or 2mm; wherein the horizontal spacing between the two reference pinholes 602, between the left front pinhole 603 and the corresponding front pinhole 603 on the right, and between the left rear pinhole 604 and the corresponding rear pinhole 604 on the right are all equal. The left and right sides of the knife holder 6 are also provided with oblique pinholes 606.

[0041] The angle adjustment mechanism 7 includes an outward-turning angle adjustment piece 11, which is rotatably connected to the positioning seat 4 through a first rotating shaft 1101. The front end of the outward-turning angle adjustment piece 11 is an arc surface, and a zero-scale groove 1102 is constructed in the middle of the arc surface. The zero-scale groove 1102 is sequentially constructed with at least two angle adjustment grooves 1103 on both sides, and the angle between the zero-scale groove 1102 and the outermost angle adjustment groove 1103 is 2 to 11°; the bottom of the adjustment seat 5 is plugged into the upper part of the positioning seat 4 through a second rotating shaft 502, and a toggle rod 503 is downwardly arranged at the bottom of the adjustment seat 5 The toggle lever 503 is located in front of the second rotating shaft 502, and a toggle slot 1104 is constructed at the rear end of the eversion angle adjustment piece 11. The toggle lever 503 is inserted into the toggle slot 1104. The number of the angle adjustment slots 1103 on both sides is 11 or 5; when the number of the angle adjustment slots 1103 on both sides is 11, the 11 angle adjustment slots 1103 respectively correspond to the whole degrees in the range of 1 to 11°; when the number of the angle adjustment slots 1103 on both sides is 5, the 5 angle adjustment slots 1103 respectively correspond to 3°, 5°, 7°, 9°, and 11°.

[0042] The second locking mechanism 9 is located at the front side of the eversion angle adjustment plate 11, and the second locking mechanism 9 includes a sliding block 12, a sliding rod 13, and a first spring 14. The positioning seat 4 is configured with a second sliding groove 402 corresponding to the sliding block 12, and the sliding rod 13 and the first spring 14 are arranged in the second sliding groove 402. The lower part of the sliding block 12 is slidably connected to the sliding rod 13, and the upper part of the sliding block 12 is connected rearwardly with a positioning tip 1201. The sliding block 12 can drive the positioning tip 1201 to insert into or disengage from the zero scale groove 1102 and the angle adjustment groove 1103. The first spring 14 can squeeze the sliding block 12 so that the positioning tip 1201 is inserted into the zero scale groove 1102 and the angle adjustment groove 1103.

[0043] The third locking mechanism 10 includes a pressing plate 21, which is rotatably connected to the upper part of the adjustment seat 5 through a horizontally arranged third rotating shaft 22. The bottom of the pressing plate 21 is connected to the adjustment seat 5 through a third spring 23. A protrusion 2101 is downwardly arranged at the rear end of the pressing plate 21. A plurality of grooves 605 are arranged on the tool holder 6 corresponding to the protrusion 2101. The protrusion 2101 can cooperate with the groove 605 to fix and adjust the position of the tool holder 6.

[0044] Working principle: When in use, the utility model is assembled, and the positioning point of the distal horizontal plane of the femur is first determined by the lower plug 101, and inserted into the outer end of the femur together with the upper plug 102, and then the position of the horizontal rod 2 on the adjusting handle 1 is adjusted, and locked by the first locking mechanism 3, and then the positioning seat 4 is slid along the horizontal rod 2. After sliding to the required position, the adjusting seat 5 is driven by the angle adjustment mechanism 7 to make a small angle adjustment, thereby realizing the adjustment of the angle of the tool holder 6. After the position and angle of the tool holder 6 are adjusted, the positioning steel needle is inserted through the reference pinhole 602, the front pinhole 603, the rear pinhole 604 and the oblique pinhole 606 on the tool holder 6 to position the tool holder 6. After that, the tool holder 6 can be disengaged from the adjusting seat 5 by pressing the pressing piece 21 in the third locking mechanism 10, and then all other components except the tool holder 6 are removed, and the operation can be performed through the blade 601 on the tool holder 6.

[0045] The utility model provides an extramedullary positioning device for distal femoral osteotomy in knee replacement, which can determine the positioning point of the distal femoral horizontal plane through a lower plug after accurate positioning, and cooperate with an upper plug to insert the outer end of the femur, without deep penetration of the femur, thus avoiding damage to the inside of the medullary cavity, reducing intraoperative and postoperative bleeding, and reducing the risk of postoperative infection; the horizontal rod can be moved up and down along the adjusting handle and then locked, and the distance between the horizontal rod and the bone surface can be adjusted to meet the needs of different individual patients; the angle adjustment mechanism can drive the adjusting seat to rotate and lock, so as to achieve the purpose of adjusting the valgus angle of the tool holder.

[0046] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An extramedullary positioning device for distal femoral osteotomy in knee replacement, characterized in that: The utility model comprises an adjusting handle (1), a horizontal rod (2), a first locking mechanism (3), a positioning seat (4), an adjusting seat (5), a tool holder (6), and an angle adjusting mechanism (7); one end of the horizontal rod (2) is sleeved on the adjusting handle (1) and can slide up and down along the adjusting handle (1); the first locking mechanism (3) is used to lock the position of the horizontal rod (2); The bottom of the adjustment handle (1) is connected to a lower plug (101) and an upper plug (102) at the rear, and the upper plug (102) is longer than the lower plug (101); The positioning seat (4) is provided with a first slide groove (401), and the positioning seat (4) is horizontally slidably connected to the horizontal rod (2) via the first slide groove (401); the positioning seat (4) is provided with two positioning plates (8) downwardly, and the two positioning plates (8) are located on the left and right sides of the horizontal rod (2); The adjustment seat (5) and the angle adjustment mechanism (7) are rotatably connected to the upper part of the positioning seat (4); the rotation of the angle adjustment mechanism (7) can drive the adjustment seat (5) to rotate synchronously; the positioning seat (4) is also provided with a second locking mechanism (9) for locking the rotation angle of the angle adjustment mechanism (7); The adjustment seat (5) is provided with an insertion rod (501) at the rear, the adjustment seat (5) is slidably connected to the tool holder (6) via the insertion rod (501), and a third locking mechanism (10) for fixing the position of the tool holder (6) is provided on the adjustment seat (5).

2. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 1, characterized in that: The angle adjustment mechanism (7) comprises an outward-turning angle adjustment plate (11), the outward-turning angle adjustment plate (11) being rotatably connected to the positioning seat (4) via a first rotating shaft (1101), the front end of the outward-turning angle adjustment plate (11) being an arc-shaped surface, the middle of the arc-shaped surface being provided with a zero-scale groove (1102), the zero-scale groove (1102) being provided with at least two angle adjustment grooves (1103) on both sides in sequence, the zero-scale groove (1102) and the outermost The angle of the angle adjustment groove (1103) is 2-11 degrees; the bottom of the adjustment seat (5) is plugged into the upper part of the positioning seat (4) via the second rotating shaft (502); a toggle rod (503) is arranged downwardly at the bottom of the adjustment seat (5); the toggle rod (503) is located in front of the second rotating shaft (502); a toggle groove (1104) is constructed at the rear end of the outward-turning angle adjustment piece (11); the toggle rod (503) is plugged into the toggle groove (1104).

3. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 2, characterized in that: The second locking mechanism (9) is located at the front side of the outward-turning angle adjustment plate (11). The second locking mechanism (9) comprises a sliding block (12), a sliding rod (13), and a first spring (14). A second sliding groove (402) is constructed on the positioning seat (4) corresponding to the sliding block (12). The sliding rod (13) and the first spring (14) are arranged in the second sliding groove (402). The lower part of the sliding block (12) is slidably connected to the sliding rod (13). The upper part of the sliding block (12) is connected to a positioning tip (1201) backward. The sliding block (12) can drive the positioning tip (1201) to insert into or disengage from the zero scale groove (1102) and the angle adjustment groove (1103). The first spring (14) can press the sliding block (12) so that the positioning tip (1201) is inserted into the zero scale groove (1102) and the angle adjustment groove (1103).

4. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 1, characterized in that: The horizontal rod (2) includes a positioning rod (15), the front end of the positioning rod (15) is connected to a sliding sleeve (16), the sliding sleeve (16) is sleeved on the adjustment handle (1) and can slide up and down along the adjustment handle (1), the first locking mechanism (3) is arranged between the sliding sleeve (16) and the adjustment handle (1), the first locking mechanism (3) includes a pull rod (17), the sliding sleeve (16) is slidably connected to the pull rod (17), the front end of the pull rod (17) is connected to a pull handle (18), the pull rod (1 7) The rear end of the sliding sleeve (16) is inserted into a locking block (19) connected thereto, the rear end of the locking block (19) is provided with a latching tooth (1901), the adjusting handle (1) is provided with a vertical groove (103), the vertical groove (103) is provided with a plurality of latching grooves (104) for the latching teeth (1901) to be inserted therein, a second spring (20) is provided between the locking block (19) and the sliding sleeve (16), the second spring (20) can press the locking block (19) so that the latching teeth (1901) are inserted into the latching grooves (104).

5. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 2, characterized in that: The number of the angle adjustment slots (1103) on both sides is 11 or 5; The angle adjustment slots (1103) on both sides are 11 in number, and the 11 angle adjustment slots (1103) respectively correspond to integer degrees within the range of 1 to 11 degrees; There are five angle adjustment slots (1103) on both sides, and the five angle adjustment slots (1103) correspond to 3°, 5°, 7°, 9°, and 11°, respectively.

6. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 1, characterized in that: The front portion of the knife holder (6) is provided with at least two knife edges (601) extending vertically therethrough, and the rear portion of the knife holder (6) is symmetrically provided with two reference pinholes (602), and the front and rear of one side of the reference pinhole (602) are respectively provided with a front pinhole (603) and a rear pinhole (604), and the front-to-back spacing between the centers of the reference pinhole (602) and the adjacent front pinhole (603) or rear pinhole (604) is 1 mm or 2 mm; the spacing between adjacent front pinholes (603) or rear pinholes (604) is 1 mm or 2 mm; wherein the horizontal spacing between the two reference pinholes (602), between the left front pinhole (603) and the corresponding front pinhole (603) on the right, and between the left rear pinhole (604) and the corresponding rear pinhole (604) on the right are all equal.

7. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 6, characterized in that: The third locking mechanism (10) comprises a pressing plate (21) which is rotatably connected to the upper part of the adjustment seat (5) via a third rotating shaft (22) arranged horizontally; the bottom of the pressing plate (21) is connected to the adjustment seat (5) via a third spring (23); a protrusion (2101) is arranged downward at the rear end of the pressing plate (21); a plurality of grooves (605) are arranged on the tool holder (6) corresponding to the protrusion (2101); the protrusion (2101) can cooperate with the groove (605) to fix and adjust the position of the tool holder (6).

8. The extramedullary positioning device for distal femoral osteotomy in knee replacement according to claim 6, characterized in that: Oblique needle holes (606) are also provided on the left and right sides of the knife holder (6).

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