Assist device for correcting abnormal femoral neck anteversion angle and use method thereof

Abstract

The invention relates to the technical field of surgery for correcting abnormal femoral neck forward inclination angle, and discloses an assist device for correcting abnormal femoral neck forward inclination angle and a using method thereof.The assist device comprises two handles arranged in parallel, and arc-shaped jaws are fixedly installed at the tail ends of the front end heads; the pressing rod is adjustably mounted at the end of the handle; wherein an arc-shaped bottom plate is fixedly mounted on the outer wall of one arc-shaped plier mouth, and the other arc-shaped plier mouth is rotationally mounted on the arc-shaped bottom plate. According to the assist device for correcting the abnormal femoral neck anteversion angle, through cooperation of the two sets of arc-shaped clamp mouths and the pressing rods, the two sides of a femoral truncation position can be rapidly and stably clamped in an operation, the angle of the truncation femoral can be conveniently adjusted, the truncation femoral can also be held, and after the truncation femoral is rotated to the target angle, the femoral neck anteversion angle can be accurately corrected. The bone fracture plate can be perfectly attached to the bone surface, pressurization and healing of the broken end of the bone are facilitated, and then the postoperative recovery effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of surgery for correcting abnormal femoral neck anteversion angle, and in particular to an auxiliary device for correcting abnormal femoral neck anteversion angle and a method for using the auxiliary device. Background Art

[0002] The normal adult femoral neck anteversion angle is about 12-15°, but some patients with hip dysplasia not only have deformities on the acetabulum side, but also have abnormal femoral neck anteversion angles (often larger anteversion angles). Abnormally larger patients may have abnormal gait, such as pigeon-toed, etc.; they may also experience hip pain or even accelerate hip degeneration due to poor matching of the acetabulum to the femoral head, with stress concentrated in the front.

[0003] For patients with abnormally increased anteversion (generally greater than 50°), in addition to periacetabular osteotomy to improve acetabular coverage of the lateral femoral head, proximal femoral osteotomy should be performed to correct the femoral neck anteversion to improve the matching of the acetabulum and femoral head during hip preservation surgery. Conventional subtrochanteric osteotomy is performed by cutting the femur below the lesser trochanter and rotating the bone fragment to the target angle, which is then fixed with a locking compression plate.

[0004] In actual surgery, a Kirschner wire will be drilled into the far and near ends of the predetermined plate placement position according to the preoperative planned angle. After osteotomy, the Kirschner wire will be used as a positioning rod to rotate to the target angle. For example, if the preoperative anteversion angle is 65° and it is planned to be adjusted to 30° (i.e., correcting the abnormal anteversion of 35°), then the distal Kirschner wire will be drilled along the center of the femoral longitudinal axis when the patient is in the lateral position, and the proximal Kirschner wire will be drilled at an angle of 35° to it. After osteotomy, the femur will be bent until the angle between the two Kirschner wires is 0°, and then the plate and screws will be implanted to complete the internal fixation.

[0005] However, in actual application, we found that the above surgical methods have certain shortcomings, such as: 1. The angle control of the two Kirschner wires is complicated. Generally, the assistant aims from the far end to prompt the surgeon to drill the second Kirschner wire in the predetermined angle direction by using a protractor to approach the first Kirschner wire. Due to the shaking of the Kirschner wire, the angle between the two Kirschner wires after drilling often deviates from the predetermined angle. Even if there is no deviation, the aiming process is too complicated and inconvenient. 2. Before osteotomy, two metal baffles need to be inserted under the femur as protection to prevent the electric saw from accidentally injuring the surrounding tissues. This process depends entirely on the surgeon's feel and experience. If the osteotomy surface is not perpendicular to the longitudinal axis of the femur, it will be difficult to align the osteotomy surface after rotation, resulting in excessive defects at the fracture ends or angular deformity after aligning. If there is no control, when the osteotomy reaches the second layer of cortex and is about to break, the two ends of the osteotomy will align and bite the saw blade due to gravity and muscle tension. At this time, the distal limb may be pried to release the bite, but prying it when it is not completely sawed off will easily cause cortical splitting, resulting in an uneven osteotomy surface and inability to align. 3. After osteotomy, there is no effective grip at both ends. Even if the osteotomy surface is vertical and flat, the broken ends are easily dislocated during internal fixation after derotation. Repeated adjustments are required to make the bone plate fit perfectly with the bone surface and the osteotomy surface as close to the pressure as possible to facilitate the healing of the osteotomy ends. Summary of the invention

[0006] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an auxiliary device for correcting abnormal femoral neck anteversion and a method of using the device, which has the advantages of being able to conveniently adjust the angle of the severed femur, effectively protect the surrounding tissues below the femur, and stably hold the two sections of the osteotomy.

[0007] (II) Technical solution In order to achieve the above-mentioned purpose of conveniently adjusting the angle of the truncated femur, effectively protecting the surrounding tissues below the femur, and stably holding the two sections of the osteotomy, the present invention provides the following technical solution: an auxiliary device for correcting the abnormal anteversion angle of the femoral neck, comprising: Two handles are arranged in parallel, and arc-shaped pliers are fixedly installed at the ends of the front ends; A clamping rod, adjustably mounted on the end of the handle; An arc-shaped bottom plate is fixedly mounted on the outer wall of one of the arc-shaped pliers mouths, and the other arc-shaped pliers mouth is rotatably mounted on the arc-shaped bottom plate.

[0008] As a preferred technical solution of the present invention, an extension rod is detachably mounted on the top end of the clamping rod.

[0009] As a preferred technical solution of the present invention, a T-shaped slide plate is fixedly installed at the bottom of the extension rod, and the T-shaped slide plate is slidably installed in a T-shaped slide groove, and the T-shaped slide groove is opened at the top end of the clamping rod.

[0010] As a preferred technical solution of the present invention, a slide plate is fixedly connected to the bottom of the clamping rod, and the slide plate is slidably installed in a slide groove provided on the end of the handle.

[0011] As a preferred technical solution of the present invention, an inner cavity is formed inside the handle, a moving block is slidably installed in the inner cavity, a moving plate is fixedly installed on the outer wall of the moving block, and the sliding plate is fixedly installed on the moving plate.

[0012] As a preferred technical solution of the present invention, it also includes a nut fixedly installed in the inner cavity, the inner wall of the nut is threadedly connected to a screw rod, one end of the screw rod is rotatably connected to the moving block, and the other end extends to the outside of the handle and is fixedly connected to a knob.

[0013] As a preferred technical solution of the present invention, the handle includes a fixed handle and a movable handle arranged in parallel, the arc-shaped base plate is fixedly mounted on the outer wall of the arc-shaped pliers mouth at the end of the fixed handle, and the arc-shaped pliers mouth at the end of the movable handle is rotatably mounted on the arc-shaped base plate.

[0014] As a preferred technical solution of the present invention, a fixed block is fixedly installed on the outer wall of the movable handle, a slide bar is fixedly installed on the fixed block, the slide bar is slidably arranged in a guide groove on the arc guide rail, and the arc guide rail is fixedly installed on the fixed handle; The virtual center of the guide groove coincides with the virtual center of the arc-shaped pliers mouth.

[0015] As a preferred technical solution of the present invention, the sliding rod is a threaded rod, on which a baffle is fixedly mounted and a locking nut is threadedly connected, and the baffle and locking nut are respectively arranged on both sides of the arc guide rail for clamping the arc guide rail.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides an auxiliary device for correcting abnormal femoral neck anteversion angle, which has the following beneficial effects: 1. The auxiliary device for correcting abnormal femoral neck anteversion angle can quickly and stably clamp both sides of the femoral cut during surgery through the cooperation of two sets of arc-shaped forceps and a clamping rod, which is not only conducive to adjusting the angle of the femur after the cut, but also can hold the femur after the cut, so that after the cut femur is rotated to the target angle, the bone plate can fit perfectly with the bone surface, which is conducive to the pressurization and healing of the bone ends, thereby improving the postoperative recovery effect.

[0017] 2. The auxiliary device used to correct the abnormal anteversion angle of the femoral neck can effectively protect the tissue under the femur during the cutting process, reduce the risk of damage to the surrounding tissue by the electric saw, and improve the safety of the operation through the design of the curved bottom plate. At the same time, it can also provide rotation support for the movable handle to facilitate the adjustment of the angle.

[0018] 3. The auxiliary device for correcting abnormal femoral neck anteversion angle not only ensures the stability of the rotation of the movable handle through the sliding of the slide bar in the guide groove, but also can provide an accurate angle reference for the rotation of the femur. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the application state of the present invention; Figure 2 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the movable handle of the present invention when being adjusted; Figure 4 It is an enlarged schematic diagram of the arc-shaped pliers mouth portion of the present invention; Figure 5 It is a cross-sectional view of the movable handle portion of the present invention.

[0020] In the figure: 1. femur; 2. fixed handle; 3. movable handle; 4. arc-shaped jaw; 5. clamping rod; 6. extension rod; 7. slide plate; 8. slide groove; 9. arc-shaped bottom plate; 10. handle groove; 11. fixed block; 12. slide rod; 13. arc-shaped guide rail; 14. guide groove; 15. baffle; 16. locking nut; 17. movable plate; 18. movable block; 19. nut; 20. screw rod; 21. knob. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0022] Embodiment 1: See also Figure 1-Figure 5 , an auxiliary device for correcting abnormal femoral neck anteversion angle, comprising two handles arranged in parallel, such as Figure 2 As shown, the ends of the front ends of the two handles are fixedly installed with arc-shaped pliers 4. In addition, an arc-shaped clamping rod 5 is movably provided on the ends of the handles. When in use, the two arc-shaped pliers 4 are inserted and clamped under the femur 1, and the pre-selected truncation point is located between the two arc-shaped pliers 4. Then, the two clamping rods 5 are controlled to move, and the clamping rods 5 move to cooperate with the arc-shaped pliers 4 to clamp the femur 1, and the handles are fixed on the femur 1 (such as Figure 1 as shown).

[0023] In this embodiment, an arc bottom plate 9 is fixedly mounted on the outer wall of one arc-shaped pliers mouth 4, and the other arc-shaped pliers mouth 4 is rotatably mounted on the arc bottom plate 9. The arc bottom plate 9 can effectively protect the tissue below the femur 1 during the cutting process, reduce the risk of damage to the surrounding tissue by the electric saw, and improve the safety of the operation. At the same time, it can also provide a rotating support for the handle to facilitate the adjustment of the angle. like Figure 2 As shown, the handle includes a fixed handle 2 and a movable handle 3 arranged in parallel, and the arc-shaped bottom plate 9 is fixedly mounted on the outer wall of the arc-shaped jaw 4 at the end of the fixed handle 2, and the arc-shaped jaw 4 at the end of the movable handle 3 is rotatably mounted on the arc-shaped bottom plate 9. In this way, after osteotomy, the movable handle 3 can be rotated to adjust the angle of the cut femur 1, such as Figure 4 As shown, a handle groove 10 is also provided on the arc bottom plate 9 for facilitating the movement of the handle.

[0024] The specific rotational installation method of the arc-shaped pliers mouth 4 at the end of the movable handle 3 on the arc-shaped base plate 9 can be set by technical personnel in this field according to actual needs. For example, an arc-shaped guide groove with a T-shaped cross section can be opened on the outer wall of the arc-shaped pliers mouth 4, and an arc-shaped guide bar with a T-shaped cross section corresponding to the guide groove can be fixedly installed on the inner wall of the arc-shaped base plate 9.

[0025] Through the cooperation of two sets of arc-shaped forceps mouths 4 and the clamping rod 5, the two sides of the femur 1 can be clamped quickly and stably during the operation, which is conducive to adjusting the angle of the femur 1 after the truncation, and can also hold the femur 1 after the truncation, so that after the femur 1 after the truncation is rotated to the target angle, the bone plate can fit perfectly with the bone surface, which is conducive to the pressurization and healing of the bone ends, thereby improving the postoperative recovery effect.

[0026] like Figure 2 As shown, an arc-shaped extension rod 6 is also provided at the top of the pressing rod 5, which can further ensure the fixing effect on the femur 1; After the angle of the cut femur 1 is adjusted, a bone plate and screws are implanted at the cut site to complete internal fixation. In order to avoid the extension rod 6 from blocking the fixation of the bone plate, in this embodiment, the extension rod 6 is detachably mounted on the top of the clamping rod 5. For details, please refer to Figure 4 A T-shaped slide is fixedly installed at the bottom of the extension rod 6, and the T-shaped slide is slidably installed in the T-shaped slide groove. The T-shaped slide groove is opened at the top of the clamping rod 5. The T-shaped slide is slid into the T-shaped slide groove, and the extension rod 6 can be installed on the top of the clamping rod 5. When the bone plate needs to be implanted, the extension rod 6 can be removed.

[0027] In this embodiment, in order to ensure the fixing effect of the arc-shaped pliers mouth 4 on the femur 1, friction teeth are evenly arranged on the inner wall of the arc-shaped pliers mouth 4 to increase the friction force.

[0028] In the present invention, if Figure 3 As shown, a fixed block 11 is fixedly mounted on the outer wall of the movable handle 3, a slide bar 12 is fixedly mounted on the fixed block 11, the slide bar 12 is slidably arranged in a guide groove 14 on an arc-shaped guide rail 13, the virtual center of the guide groove 14 coincides with the virtual center of the arc-shaped pliers mouth 4, the arc-shaped guide rail 13 is fixedly mounted on the fixed handle 2, and an angle mark is provided on the outer wall; The sliding of the slide bar 12 in the guide groove 14 not only ensures the stability of the rotation of the movable handle 3, but also can use the angle mark to provide an accurate angle reference for the rotation of the femur 1, ensuring that the truncated femur 1 can be corrected to the predetermined anteversion angle to avoid errors.

[0029] Furthermore, the sliding rod 12 is a threaded rod, and a baffle 15 is fixedly installed on the threaded rod, and a locking nut 16 is threadedly connected. The baffle 15 and the locking nut 16 are respectively arranged on both sides of the arc guide rail 13. By turning the locking nut 16, the arc guide rail 13 can be clamped through the locking nut 16 and the baffle 15, and the position of the movable handle 3 can be fixed, thereby facilitating the maintenance of the rotationally adjusted position of the femur 1.

[0030] In this embodiment, a specific adjustment mechanism for the pressing rod 5 is provided. Figure 5 As shown, a slide plate 7 is fixedly connected to the bottom of the pressing rod 5, and the slide plate 7 is slidably installed in a slide groove 8 opened on the end of the handle. An inner cavity is formed inside the handle, and a moving block 18 is slidably installed in the inner cavity. A moving plate 17 is fixedly installed on the outer wall of the moving block 18, and the slide plate 7 is fixedly installed on the moving plate 17; Furthermore, a nut 19 is provided, which is fixedly installed in the inner cavity, and a screw rod 20 is threadedly connected to the inner wall of the nut 19, one end of the screw rod 20 is rotatably connected to the moving block 18, and the other end extends to the outside of the handle and is fixedly connected to a knob 21; When the knob 21 is turned to rotate the screw rod 20, the screw rod 20 will move inward or outward under the action of the nut 19, thereby pushing / pulling the moving block 18 to move. The moving block 18 moves through the moving plate 17 and the slide plate 7, which can drive the clamping rod 5 to move and adjust the position of the clamping rod 5.

[0031] Embodiment 2: See also Figure 1-Figure 5 In this embodiment, a method for using an auxiliary device for correcting abnormal femoral neck anteversion angle is provided, which specifically includes the following steps: Step 1: insert the two arc-shaped jaws 4 at the front ends of the fixed handle 2 and the movable handle 3 and clamp them under the femur 1, and the pre-selected cut-off point is located between the two arc-shaped jaws 4; Step 2: Control the movement of the two clamping rods 5, cooperate with the two arc-shaped forceps mouths 4 to clamp the femur 1, and protect the tissue below the femur 1 through the arc-shaped bottom plate 9; Step 3, using an electric saw to cut off the femur 1 from a pre-selected cutting position; Step 4: Turn the movable handle 3 to rotate the severed femur 1 to a predetermined angle; Step 5: Implant the bone plate and screws at the cut site to complete the internal fixation.

[0032] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for correcting abnormal femoral neck anteversion angle, It is characterized in that include: Two handles are arranged in parallel, and arc-shaped pliers (4) are fixedly mounted at the ends of the front ends; A clamping rod (5) adjustably mounted on the end of the handle; An arc-shaped bottom plate (9) is fixedly mounted on the outer wall of one of the arc-shaped pliers mouths (4), and the other arc-shaped pliers mouth (4) is rotatably mounted on the arc-shaped bottom plate (9).

2. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 1, Features: An extension rod (6) is detachably mounted on the top end of the pressing rod (5).

3. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 2, Features: A T-shaped slide plate is fixedly mounted on the bottom of the extension rod (6), and the T-shaped slide plate is slidably mounted in a T-shaped slide groove, and the T-shaped slide groove is opened at the top end of the clamping rod (5).

4. The auxiliary device for correcting abnormal femoral neck anteversion according to claim 1, Features: The bottom of the pressing rod (5) is fixedly connected to a slide plate (7), and the slide plate (7) is slidably mounted in a slide groove (8) provided on the end of the handle.

5. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 4, Features: An inner cavity is formed inside the handle, a moving block (18) is slidably mounted inside the inner cavity, a moving plate (17) is fixedly mounted on the outer wall of the moving block (18), and the sliding plate (7) is fixedly mounted on the moving plate (17).

6. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 5, Features: It also includes a nut (19) fixedly mounted in the inner cavity, the inner wall of the nut (19) being threadedly connected to a screw rod (20), one end of the screw rod (20) being rotatably connected to the moving block (18), and the other end extending to the outside of the handle and fixedly connected to a knob (21).

7. An auxiliary device for correcting abnormal femoral neck anteversion according to any one of claims 1 to 6, Features: The handle comprises a fixed handle (2) and a movable handle (3) arranged in parallel, the arc-shaped bottom plate (9) is fixedly mounted on the outer wall of the arc-shaped pliers mouth (4) at the end of the fixed handle (2), and the arc-shaped pliers mouth (4) at the end of the movable handle (3) is rotatably mounted on the arc-shaped bottom plate (9).

8. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 7, Features: A fixed block (11) is fixedly mounted on the outer wall of the movable handle (3); a slide bar (12) is fixedly mounted on the fixed block (11); the slide bar (12) is slidably arranged in a guide groove (14) on an arc-shaped guide rail (13); and the arc-shaped guide rail (13) is fixedly mounted on the fixed handle (2); The virtual center of the guide groove (14) coincides with the virtual center of the arc-shaped pliers mouth (4).

9. An auxiliary device for correcting abnormal femoral neck anteversion according to claim 8, Features: The slide rod (12) is a threaded rod, on which a baffle (15) is fixedly mounted and a locking nut (16) is threadedly connected. The baffle (15) and the locking nut (16) are respectively arranged on both sides of the arc-shaped guide rail (13) and are used to clamp the arc-shaped guide rail (13).

10. A method for using an auxiliary device for correcting abnormal femoral neck anteversion angle, Features: The following steps are involved: S1. Insert and clamp the two arc-shaped jaws (4) at the front ends of the fixed handle (2) and the movable handle (3) below the femur (1), with the pre-selected cut-off point located between the two arc-shaped jaws (4); S2, controlling the movement of the two clamping rods (5), cooperating with the two arc-shaped clamp mouths (4) to clamp the femur (1), and protecting the tissue below the femur (1) through the arc-shaped bottom plate (9); S3, using an electric saw to cut the femur at a pre-selected cutting point (1); S4, turning the movable handle (3) to rotate the severed femur (1) to a predetermined angle; S5. Implant bone plates and screws at the cut site to complete internal fixation.

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