An assistive device for correcting abnormal anteversion angle of the femoral neck

Abstract

The present invention discloses an auxiliary device for correcting abnormal femoral neck anteversion, which belongs to the technical field of proximal femoral deformity correction. The device comprises a fixed ring plate and a movable ring plate connected thereto via an arcuate groove and a sliding block, wherein the arcuate groove is provided on the side of the fixed ring plate, and the sliding block is provided on the side of the movable ring plate facing the fixed ring plate. An operating rod is installed on both the fixed ring plate and the movable ring plate, and a tooth socket is provided on the upper surface of the operating rod, wherein limited teeth are evenly distributed in the tooth socket. The invention can ensure the protection of surrounding muscles and vascular nerve tissues during osteotomy, thereby improving the safety of osteotomy; after osteotomy, the proximal femur can be accurately rotated at any angle, thereby improving the accuracy of the operation; in addition, the two osteotomy surfaces can be ensured to remain unchanged in the axial position during rotation after osteotomy, thereby maintaining the osteotomy surfaces always in contact, effectively preventing angular dislocation of the osteotomy ends, avoiding increased difficulty in reduction after dislocation and prolonged operation time, thereby improving the convenience of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of proximal femoral deformity correction, in particular to an auxiliary device for correcting abnormal femoral neck anteversion angle. Background Art

[0002] In the human hip joint structure, the femoral neck anteversion angle is a key parameter affecting the biomechanical balance and function of the hip joint. The normal range for adults is usually 12°-15°. When this angle is abnormal (too much or too little anteversion), the femoral head and acetabulum of the hip joint are poorly matched, resulting in joint pain, limited movement and abnormal gait, and even hip joint degeneration in young and middle-aged people, seriously affecting the patient's daily activities and quality of life.

[0003] During surgery to correct abnormal femoral neck anteversion, two Kirschner wires at angles to each other (the angle is set according to preoperative planning) are drilled into the distal and proximal ends of the osteotomy. After the femur is cut, the proximal femur is rotated with bone forceps to correct the femoral neck anteversion angle. Ultimately, the two Kirschner wires are made parallel or overlapping when visually inspected from one end to the other. Finally, internal fixation is performed using a steel plate and screw system to correct the abnormal femoral neck anteversion angle.

[0004] Traditional surgical methods have many disadvantages when performing the above operations:

[0005] First, before osteotomy, two Kirschner wires are drilled into the femur at an angle calculated preoperatively. However, in practice, without specialized tools, the angle is controlled visually, resulting in poor surgical precision. Theoretically, after osteotomy, by bending the femur to make the Kirschner wires parallel or overlapping, and then performing internal fixation, it is possible to maintain the corrected anteversion angle. However, in practice, the tremendous pressure applied when the internal fixation screws are screwed in can easily cause loss of position, often resulting in over- or undercorrection of the anteversion angle. When the two Kirschner wires are re-aligned, they are no longer parallel or overlapping.

[0006] Before osteotomy at the predetermined osteotomy line, the femur is surrounded by abundant soft tissue, making full exposure of the osteotomy site difficult. To obtain a good surgical field of view, extensive dissection of the surrounding tissue is often necessary. Two assistants, one in front and one behind, insert two bone pryers into the base of the femur, positioning them opposite each other to act as a barrier, protecting the surrounding tissue, especially the muscles, blood vessels, and nerves deep within. This process, requiring two assistants, is time-consuming and laborious. Furthermore, extensive dissection impairs blood supply around the osteotomy line, hindering healing.

[0007] After osteotomy, the tension of the muscles and surrounding tissues causes the proximal femur to rotate. Without specialized tools to firmly constrain the osteotomy end, it is impossible to ensure a close fit with the other osteotomy surface. This can easily lead to misalignment of the two osteotomy ends, resulting in angular deformity and inability to quickly achieve a satisfactory reduction. Subsequent repeated adjustments and reductions not only prolong the operation time and increase the blood supply to the osteotomy ends through repeated clamping, but can also cause a change in the corrected anteversion angle, compromising the therapeutic effect.

[0008] Therefore, there is a need for an auxiliary device for correcting abnormal femoral neck anteversion angle to solve the above problems. Summary of the Invention

[0009] The purpose of the present invention is to provide an auxiliary device for correcting abnormal femoral neck anteversion angle, so as to solve the problems raised in the above background technology in the operation to correct abnormal femoral neck anteversion angle, such as difficulty in exposure, destruction of blood supply, inaccurate correction angle and easy angular dislocation.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] 7. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod. said linking rod is pivotally connected to said linking rod. said linking rod is pivotally connected to said linking rod.

[0012] Preferably, the clamping assembly also includes a limit frame 1 provided on one side of the operating rod, and a pull plate is provided through the upper limit of the limit frame 1, and the end of the pull plate facing the rotating ring plate is connected to one end of the wire rope, and a guide wheel is provided on the operating rod for guiding the wire rope.

[0013] Preferably, the clamping assembly also includes a mounting groove arranged on the side of the operating rod, and one end of the limiting block is movably extended into the mounting groove, and a second spring is installed between the end of the limiting block extending into the mounting groove and the bottom end of the mounting groove, and the pull plate is evenly provided with through holes passing through both sides thereof, and the end of the limiting block extending out of the mounting groove passes through the through holes at the corresponding position.

[0014] Preferably, the through hole and the end of the limiting block extending out of the mounting slot are both right-angled trapezoidal prisms, and the pulling plate is L-shaped.

[0015] Preferably, the clamping assembly also includes a slide groove provided on the inner surfaces of the fixed ring plate, the movable ring plate and the rotating ring plate, and a slider is slidably connected in the slide groove, the inner sides of the fixed ring plate, the movable ring plate and the rotating ring plate are all provided with an arc plate, and the three sliders are fixedly connected to the outer sides of the three arc plates respectively, the inner surfaces of the fixed ring plate, the movable ring plate and the rotating ring plate are all fixedly connected with a flat plate, and a flat tube is sleeved on the flat plate, the flat tube is fixedly connected to one side of the corresponding positioning plate, and a cross bar is connected to the bearing between the two flat tubes connected on the positioning plate.

[0016] Preferably, the arc plates on the inner sides of the fixed ring plate and the movable ring plate are respectively in contact with and connected to the arc plates on the inner sides of the corresponding rotating ring plates, so that when the arc plates on the inner sides of the fixed ring plate and the movable ring plate move, the arc plates on the inner sides of the corresponding rotating ring plates are driven to move synchronously, and the outer sides of the fixed ring plate and the movable ring plate are both provided with strip-shaped through holes penetrating into the corresponding slide grooves, and an extrusion block 2 is provided on the inner side of the arc plate, and the surface of the extrusion block 2 facing the center of the arc plate is an arc surface, and the surface of the extrusion block 2 facing the center of the arc plate is in rolling contact with the cross bar, and a rod-shaped protrusion is provided on the arc plate, and the rod-shaped protrusion movably passes through the strip through hole and is connected to the other end of the wire rope.

[0017] Preferably, the rotation limit assembly includes a connecting groove arranged on the movable ring plate, and an arc rod is arranged in the connecting groove, a limit frame 2 is provided on the other side of the operating rod connected to the movable ring plate, and a push rod is passed through the upper limit of the limit frame 2, one end of the push rod extends into the connecting groove and contacts and connects with the end of the arc rod, and the other end shaft of the push rod is connected to a screw rod, and the screw rod thread passes through the raised part on the operating rod connected to the movable ring plate.

[0018] Preferably, the contact portion between the push rod and the arc rod is a smooth hemispherical structure, which facilitates the movement of the arc rod through the squeezing of the push rod.

[0019] Preferably, the rotation limit assembly also includes a through cavity provided on the sliding block and extending through the connecting groove, a through rod is provided through the through cavity, and one end of the through rod is connected to a pawl plate, the pawl provided on the pawl plate is meshed with the ratchet, and the other end of the through rod is a smooth hemispherical structure, and an extrusion block 1 is provided on the side of the arc rod facing the through rod, and the side of the extrusion block 1 facing the through rod is an arc surface, and the extrusion block 1 is in contact and sliding connection with the other end of the through rod toward the side of the through rod, a limiting disk is provided on the through rod part in the through cavity, and a spring 1 is provided between the limiting disk and the inner side of the through cavity.

[0020] Preferably, the outer side surfaces of the two rotating ring plates are provided with scales for reading the relative angle of rotation between the two rotating ring plates.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the auxiliary device for correcting abnormal femoral neck anteversion can ensure that the surrounding muscles and blood vessels and nerve tissues are protected during osteotomy, thereby improving the safety of osteotomy; after osteotomy, the proximal femur can be accurately rotated at any angle, thereby improving the accuracy of the operation; in addition, during the rotation after osteotomy, the two osteotomy surfaces can be ensured to remain in the same axial position, the osteotomy surfaces are always kept in contact, and the angular dislocation of the osteotomy ends is effectively prevented, thereby avoiding the increased difficulty of reduction and prolonged operation time after dislocation, thereby improving the convenience of the operation:

[0022] 1. By pulling the pull plate outward, the lower curved plate can be moved along the slide groove, and then the lower curved plate drives the upper curved plate to move synchronously, and then the squeezing block 2 can squeeze the corresponding cross bar, so that the positioning plate is close to the outside of the osteotomy to facilitate clamping the osteotomy. In this process, the limiting block is clamped into the corresponding through hole to ensure that the positioning plate can stably clamp the osteotomy;

[0023] 2. When the proximal femur after the amputation needs to be rotated, it is only necessary to turn the operating rod connected to the movable ring plate. Since the structural torque formed by the operating rod and the movable ring plate is relatively long, it is relatively labor-saving. In addition, the one-way rotation structure formed by the pawl plate and the ratchet can easily fix the rotation angle of the proximal femur after the amputation, which is convenient for subsequent fixation of the steel plate.

[0024] 3. When the proximal femur after being cut is rotated, since the axes of the fixed ring plate and the movable ring plate remain collinear, the position of the proximal femur after being cut can be guaranteed to always correspond to the position of the other osteotomy section, thus avoiding dislocation of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the main connection structure of the fixed ring plate of the present invention;

[0027] Figure 3 This is a schematic diagram of the rear view connection structure of the movable ring plate of the present invention;

[0028] Figure 4 This is a schematic diagram of the cross-sectional connection structure of the present invention;

[0029] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of point A;

[0030] Figure 6 This is a schematic diagram of the cross-sectional connection structure of the movable ring plate of the present invention;

[0031] Figure 7 It is a schematic diagram of a partial cross-sectional connection structure of the present invention;

[0032] Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure of point B;

[0033] Figure 9 This is a schematic diagram of the connection structure between the operating rod and the pull plate of the present invention;

[0034] Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure of point C in the middle.

[0035] In the figure: 1. Fixed ring plate; 2. Movable ring plate; 3. Operating lever; 4. Tooth groove; 5. Limiting tooth; 6. Positioning tooth; 7. Strip support plate; 8. Rotating ring plate; 9. Limiting frame 1; 10. Pull plate; 11. Wire rope; 12. Arc plate; 13. Positioning plate; 14. Arc groove; 15. Ratchet; 16. Flat tube; 17. Flat plate; 18. Ratchet plate; 19. Limiting frame 2; 20. Push rod; 21. Screw rod; 22. Slide groove; 23. Sliding block; 24. Through cavity; 25. Through rod; 26. Limiting disk; 27. Spring 1; 28. Extrusion block 1; 29. Arc rod; 30. Connecting groove; 31. Cross bar; 32. Sliding block; 33. Extrusion block 2; 34. Through hole; 35. Limiting block; 36. Mounting groove; 37. Spring 2. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See also Figures 1-10 , the present invention provides the following technical solutions:

[0038] Embodiment 1: In order to solve the problem that it is difficult to rotate the proximal end of the amputated femur during the previous surgery to correct the abnormal anteversion angle of the femoral neck, the following technical solution is provided. Specifically, an auxiliary device for correcting the abnormal anteversion angle of the femoral neck includes a fixed ring plate 1 and a movable ring plate 2 connected thereto by an arc groove 14 and a sliding block 23. The arc groove 14 is arranged on the side of the fixed ring plate 1, and the sliding block 23 is arranged on the side of the movable ring plate 2 facing the fixed ring plate 1. An operating rod 3 is installed on the fixed ring plate 1 and the movable ring plate 2, and a tooth groove 4 is arranged on the upper surface of the operating rod 3. There are limit teeth 5 evenly distributed in the tooth groove 4, and the limit teeth 5 are meshed with positioning teeth 6. The fixed ring plate 1 and the movable ring plate 2 are both axially connected to a rotating ring plate 8, and the outer surface of the rotating ring plate 8 is axially connected to one end of a strip support plate 7. The positioning teeth 6 are arranged on the lower surface of the other end of the elastic metal strip support plate 7. Figure 2-Figure 3 When rotating the proximal end of the severed femur, it is only necessary to rotate the operating rod 3 connected to the movable ring plate 2. Due to the structure formed by the movable ring plate 2 and the operating rod 3 connected thereto, when rotating the proximal end of the severed femur, the torque is longer, which saves more effort, so that the proximal end of the severed femur can be rotated more easily. In the process of rotating the movable ring plate 2, the scale on the outside of the rotating ring plate 8 can be used to directly read the rotation angle of the rotating ring plate 8.

[0039] Example 2: In order to solve the problem that in previous surgeries to correct abnormal femoral neck anteversion angles, it is inconvenient to ensure that the proximal end of the severed femur corresponds to the position of another osteotomy when rotating it, the following technical solution is provided. Specifically, a clamping assembly is provided on both the fixed ring plate 1 and the movable ring plate 2. The clamping assembly includes a positioning plate 13 for clamping the osteotomy. A rotation limiting assembly is also provided between the fixed ring plate 1 and the movable ring plate 2 for limiting the rotation of the movable ring plate 2.

[0040] The clamping assembly also includes a limit frame 9 provided on one side of the operating rod 3, and a pull plate 10 is provided through the limit frame 9, and the end of the pull plate 10 facing the rotating ring plate 8 is connected to one end of the wire rope 11, and a guide wheel is provided on the operating rod 3 for guiding the wire rope 11. The clamping assembly also includes a mounting groove 36 provided on the side of the operating rod 3, and one end of the limit block 35 is movably extended into the mounting groove 36, and a spring 2 37 is installed between the end of the limit block 35 extending into the mounting groove 36 and the bottom end of the mounting groove 36. The plate 10 is evenly provided with through holes 34 passing through both sides thereof, and the end portion of the limit block 35 extending out of the mounting groove 36 passes through the through hole 34 at the corresponding position, and the through hole 34 and the end portion of the limit block 35 extending out of the mounting groove 36 are both right-angled trapezoidal prisms, and the pull plate 10 is L-shaped. The clamping assembly also includes a slide groove 22 provided on the inner surface of the fixed ring plate 1, the movable ring plate 2 and the rotating ring plate 8, and a slider 32 is slidably connected in the slide groove 22, and an arc plate 12 is provided on the inner side of the fixed ring plate 1, the movable ring plate 2 and the rotating ring plate 8, and the three The sliders 32 are fixedly connected to the outside of the three arc-shaped plates 12 respectively. The inner surfaces of the fixed ring plate 1, the movable ring plate 2 and the rotating ring plate 8 are fixedly connected with flat plates 17, and a flat tube 16 is sleeved on the flat plate 17. The flat tube 16 is fixedly connected to one side of the corresponding positioning plate 13, and a cross bar 31 is connected to the bearing between the two flat tubes 16 connected to the positioning plate 13. The arc plates 12 on the inner sides of the fixed ring plate 1 and the movable ring plate 2 are respectively in contact with the arc plates 12 on the inner sides of the corresponding rotating ring plate 8, so that the arc plates on the inner sides of the fixed ring plate 1 and the movable ring plate 2 are When 12 moves, it drives the arc plate 12 on the inner side of the corresponding rotating ring plate 8 to move synchronously. The outer sides of the fixed ring plate 1 and the movable ring plate 2 are provided with a strip through hole that penetrates into the corresponding slide groove 22. An extrusion block 23 is provided on the inner side of the arc plate 12, and the surface of the extrusion block 23 facing the center of the arc plate 12 is an arc surface. The surface of the extrusion block 23 facing the center of the arc plate 12 is in rolling contact with the cross bar 31. A rod-shaped protrusion is provided on the arc plate 12, and the rod-shaped protrusion is movable through the strip through hole and is connected to the other end of the wire rope 11. Figure 1 When in use, hook the fixed ring plate 1 and the movable ring plate 2 to the outside of the part of the bone connected to the femoral neck that needs to be cut off, then rotate the rotating ring plate 8, and use the positioning teeth 6 on the strip support plate 7 to snap into the limiting teeth 5 at the appropriate position, so that the fixed ring plate 1 and the movable ring plate 2 form a complete ring with the corresponding rotating ring plate 8, and then extend the saw through the gap between the two rotating ring plates 8 to cut off the part of the bone connected to the femoral neck that needs to be cut off, forming two sections of osteotomy, according to Figure 7-10In the process of pulling the pull plate 10, the limit block 35 automatically moves toward the inside of the mounting groove 36, and pops out again after the next through hole 34 corresponds to it. In addition, the end of the limit block 35 extending out of the mounting groove 36 is a right-angled trapezoidal prism, and the through hole 34 is also a right-angled trapezoidal prism, which can prevent the pull plate 10 from moving reversely. When the pull plate 10 is pulled, it will synchronously drive the wire rope 11 to move, thereby driving the connected curved plate 12 to move. When the curved plate 12 moves, the extrusion block 2 33 thereon will squeeze the cross bar 31, so that the positioning plate 13 gradually approaches the outside of the osteotomy, thereby clamping and fixing the osteotomy.

[0041] The rotation limit assembly includes a connecting groove 30 provided on the movable ring plate 2, and an arc rod 29 is provided in the connecting groove 30, and a limit frame 29 is provided on the other side of the operating rod 3 connected to the movable ring plate 2, and the upper limit of the limit frame 21 is penetrated by a push rod 20, one end of the push rod 20 extends into the connecting groove 30 and is in contact with the end of the arc rod 29, and the other end of the push rod 20 is connected to the shaft with a screw rod 21, and the screw rod 21 threadedly penetrates the raised part on the operating rod 3 connected to the movable ring plate 2. The contact parts between the push rod 20 and the arc rod 29 are all smooth hemispherical structures, which are convenient for driving the arc rod 29 to move by squeezing the push rod 20. The rotation limit assembly also includes a through cavity 24 provided on the sliding block 23 and penetrating to the connecting groove 30, penetrating A penetrating rod 25 is provided through the cavity 24, and one end of the penetrating rod 25 is connected to a pawl plate 18, and the pawl provided on the pawl plate 18 is meshed with the ratchet 15. The other end of the penetrating rod 25 is a smooth hemispherical structure, and an extrusion block 28 is provided on the side of the arc rod 29 facing the penetrating rod 25, and the side of the extrusion block 28 facing the penetrating rod 25 is an arc surface, and the extrusion block 28 is in contact and sliding connection with the other end of the penetrating rod 25 toward the side of the penetrating rod 25. A limit plate 26 is provided on the penetrating rod 25 part in the penetrating cavity 24, and a spring 27 is provided between the limit plate 26 and the inner side of the penetrating cavity 24. The outer side surfaces of the two rotating ring plates 8 are provided with scales for reading the relative angle of rotation between the two rotating ring plates 8. Figure 4-Figure 6 When the movable ring plate 2 is rotated, the sliding block 23 will slide in the arc groove 14, and the synchronous pawl plate 18 can move on the ratchet 15 in the arc groove 14, thereby preventing the movable ring plate 2 from rotating in the opposite direction, so as to facilitate the subsequent installation of the steel plate after the Kirschner wire is inserted. When the movable ring plate 2 needs to rotate in the opposite direction, the screw rod 21 is rotated to move the push rod 20, thereby squeezing the arc rod 29, so that the arc rod 29 moves in the connecting groove 30, so that the squeezing block 28 on the arc rod 29 no longer squeezes the through rod 25. At this time, through the action of the spring 27, the ratchet 15 can be separated from the pawl on the pawl plate 18, thereby no longer limiting the movable ring plate 2, so that it can rotate in the opposite direction.

[0042] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for correcting abnormal femoral neck anteversion, comprising a fixed ring plate (1) and a movable ring plate (2) connected thereto via an arc groove (14) and a sliding block (23), characterized in that: The arc groove (14) is provided on the side of the fixed ring plate (1), and the sliding block (23) is provided on the side of the movable ring plate (2) facing the fixed ring plate (1). The fixed ring plate (1) and the movable ring plate (2) are both provided with an operating rod (3), and the upper surface of the operating rod (3) is provided with a tooth groove (4), and the tooth groove (4) is evenly distributed with limiting teeth (5), and the limiting teeth (5) are meshed with positioning teeth (6), and the fixed ring plate (1) and the movable ring plate (2) are both provided with a positioning tooth groove (4). A rotating ring plate (8) is connected to the shaft, and the outer surface of the rotating ring plate (8) is connected to one end of the strip support plate (7) through the shaft, and the positioning teeth (6) are arranged on the lower surface of the other end of the elastic metal strip support plate (7), and the fixed ring plate (1) and the movable ring plate (2) are both provided with a clamping assembly, and the clamping assembly includes a positioning plate (13) for clamping the osteotomy, and a rotation limiting assembly is also provided between the fixed ring plate (1) and the movable ring plate (2) for limiting the rotation of the movable ring plate (2); The clamping assembly further comprises a limit frame (9) provided on a side surface of the operating rod (3), and a pull plate (10) is provided through the upper limit of the limit frame (9), and the end of the pull plate (10) facing the rotating ring plate (8) is connected to one end of a steel wire rope (11), and a guide wheel is provided on the operating rod (3) for guiding the steel wire rope (11); The clamping assembly further includes a slide groove (22) provided on the inner surfaces of the fixed ring plate (1), the movable ring plate (2) and the rotating ring plate (8), and a slider (32) is slidably connected in the slide groove (22), the inner sides of the fixed ring plate (1), the movable ring plate (2) and the rotating ring plate (8) are all provided with an arc plate (12), and the three sliders (32) are respectively fixedly connected to the outer sides of the three arc plates (12), the inner surfaces of the fixed ring plate (1), the movable ring plate (2) and the rotating ring plate (8) are all fixedly connected with a flat plate (17), and a flat tube (16) is sleeved on the flat plate (17), the flat tube (16) is fixedly connected to one side of the corresponding positioning plate (13), and a cross bar (31) is bearing-connected between the two flat tubes (16) connected to the positioning plate (13); The arc-shaped plates (12) on the inner sides of the fixed ring plate (1) and the movable ring plate (2) are respectively in contact with the arc-shaped plates (12) on the inner sides of the corresponding rotating ring plate (8), so that when the arc-shaped plates (12) on the inner sides of the fixed ring plate (1) and the movable ring plate (2) move, the arc-shaped plates (12) on the inner sides of the corresponding rotating ring plate (8) are driven to move synchronously. The outer sides of the fixed ring plate (1) and the movable ring plate (2) are both provided with strip-shaped through holes penetrating into the corresponding sliding grooves (22). The inner side of the arc-shaped plate (12) is provided with an extrusion block 2 (33), and the surface of the extrusion block 2 (33) facing the center of the arc-shaped plate (12) is an arc-shaped surface. The surface of the extrusion block 2 (33) facing the center of the arc-shaped plate (12) is in rolling contact with the cross bar (31). The arc-shaped plate (12) is provided with a rod-shaped protrusion, and the rod-shaped protrusion movably passes through the strip-shaped through hole and is connected to the other end of the wire rope (11).

2. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 1, characterized in that: The clamping assembly further includes a mounting groove (36) provided on the side of the operating rod (3), and one end of the limiting block (35) is movably extended into the mounting groove (36), and a second spring (37) is installed between the end of the limiting block (35) extending into the mounting groove (36) and the bottom end of the mounting groove (36), and the pull plate (10) is evenly provided with through holes (34) passing through both sides thereof, and the end of the limiting block (35) extending out of the mounting groove (36) passes through the through holes (34) at corresponding positions.

3. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 2, characterized in that: The ends of the through hole (34) and the limiting block (35) extending out of the mounting groove (36) are both right-angled trapezoidal prisms, and the pull plate (10) is L-shaped.

4. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 1, characterized in that: The rotation limit assembly includes a connecting groove (30) provided on the movable ring plate (2), and an arc rod (29) is provided in the connecting groove (30), a limiting frame 2 (19) is provided on the other side of the operating rod (3) connected to the movable ring plate (2), and a push rod (20) is passed through the upper limit of the limiting frame 2 (19), one end of the push rod (20) extends into the connecting groove (30) and is in contact with the end of the arc rod (29), and the other end of the push rod (20) is axially connected to a screw rod (21), and the screw rod (21) is threadedly passed through a raised portion on the operating rod (3) connected to the movable ring plate (2).

5. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 4, characterized in that: The contact portions between the push rod (20) and the arc rod (29) are both smooth hemispherical structures, making it easy for the arc rod (29) to move by being squeezed by the push rod (20).

6. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 5, characterized in that: The rotation limiting assembly further includes a through cavity (24) provided on the sliding block (23) and extending through the connecting groove (30), a through rod (25) being provided through the through cavity (24), and one end of the through rod (25) being connected to a pawl plate (18), a pawl provided on the pawl plate (18) being meshed and connected with the ratchet (15), the other end of the through rod (25) being a smooth hemispherical structure, an extrusion block (28) being provided on a side of the arc-shaped rod (29) facing the through rod (25), and the side of the extrusion block (28) facing the through rod (25) being an arc-shaped surface, the extrusion block (28) being in contact and sliding connection with the other end of the through rod (25) facing the side of the through rod (25), a limiting disk (26) being provided on the through rod (25) portion in the through cavity (24), and a spring (27) being provided between the limiting disk (26) and the inner side of the through cavity (24).

7. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 6, characterized in that: The outer side surfaces of the two rotating ring plates (8) are provided with scales for reading the relative angle of rotation between the two rotating ring plates (8).

Images