Subtrochanteric femoral v-shaped osteotomy device with extramedullary positioning

Abstract

The present utility model belongs to the technical field of orthopedic medical instruments. Provided is a subtrochanteric femoral V-shaped osteotomy device with extramedullary positioning. The device comprises: two V-shaped osteotomy modules, wherein the two V-shaped osteotomy modules are arranged in the same direction and are each provided with a position fixing hole member, each position fixing hole member fits with a Kirschner wire, and a V-shaped osteotomy slot is provided in a penetrating manner between the top and the bottom of each V-shaped osteotomy module; and a positioning assembly, which comprises a sliding rail, wherein an anti-slip member is provided at the bottom end of the sliding rail, a sliding groove is provided in the top of the sliding rail, two connecting rods are slidably connected in the sliding groove and are vertically arranged, a position measurement member is provided between each connecting rod and the sliding rail, and the two V-shaped osteotomy modules are detachably connected to the two connecting rods. The present utility model can adjust an osteotomy length on the basis of the condition of a patient, can improve the anti-rotation capability of an osteotomy part, and can improve the precision and ease of surgical operations.

Description

A subtrochanteric extramedullary positioning V-shaped osteotomy device Technical Field

[0001] The utility model belongs to the technical field of orthopedic medical instruments, and in particular relates to a subtrochanteric extramedullary positioning V-shaped osteotomy device. Background Art

[0002] Developmental dysplasia of the hip (DDH), previously known as congenital dislocation of the hip, refers to abnormalities in the morphology and relative position of the proximal femur and acetabulum due to various factors during development. The overall incidence of DDH in China is approximately 1.52%, with approximately 0.75% in males and 2.07% in females. DDH can be categorized by severity as acetabular dysplasia, low dislocation, and high dislocation. Total hip arthroplasty (THA) is an ideal treatment for patients with DDH who experience severe pain in the affected limb, functional limitations, severe hip dislocation, significant femoral head deformity, joint space narrowing, and severe hip osteoarthritis.

[0003] High-dislocation DDH (e.g., shortening >4 cm) is often accompanied by soft tissue contracture, making femoral reduction after true acetabulum reconstruction during THA extremely difficult. To achieve optimal femoral head reduction while avoiding nerve traction injury, femoral shortening osteotomy is often required. Femoral shortening osteotomies can be categorized as subtrochanteric, greater trochanteric, and lesser trochanteric. Subtrochanteric shortening osteotomies offer advantages such as rapid healing at the osteotomy site, easy adjustment of the osteotomy length, proximal coated prosthesis fit and bone ingrowth, protection of the abductor muscle integrity, and restoration of tension. Currently, they are the most commonly used methods, including transverse, oblique, V-shaped, Z-shaped, and S-shaped subtrochanteric osteotomies. Transverse osteotomies are widely used due to their ease of operation, but their greatest drawback is the lack of anti-rotational protection at the osteotomy site, which can lead to complications. While V-shaped osteotomies can provide adequate anti-rotational protection, simultaneous control of the osteotomy length and alignment of the two V-shaped osteotomy surfaces can be challenging when performed manually with traditional tools. The current traditional osteotomy tools are still unable to meet clinical needs, and some intramedullary positioning V-shaped osteotomy guide tools have disadvantages such as cumbersome and complex operation and great trauma.

[0004] Utility Model Content

[0005] The purpose of the utility model is to provide a subtrochanteric extramedullary positioning V-shaped osteotomy device to solve the above problems, so as to achieve the purpose of being able to adjust the osteotomy length according to the patient's condition, improve the anti-rotation ability of the osteotomy site, and improve the accuracy and simplicity of surgical operation.

[0006] To achieve the above-mentioned purpose, the present invention provides the following solution: a subtrochanteric extramedullary positioning V-shaped osteotomy device, comprising:

[0007] Two groups of V-shaped osteotomy modules, the two V-shaped osteotomy modules are arranged in the same direction, and both of the V-shaped osteotomy modules are provided with position fixing holes, the position fixing holes are adapted to the Kirschner wires, and a V-shaped osteotomy groove is provided between the top and bottom of the V-shaped osteotomy modules;

[0008] The positioning assembly includes a slide rail, an anti-slip part is provided at the bottom end of the slide rail, a slide groove is opened at the top of the slide rail, two groups of connecting rods are slidably connected in the slide groove, the two connecting rods are vertically arranged, and a position measuring part is provided between the connecting rod and the slide rail. The two V-shaped osteotomy modules are detachably connected to the two connecting rods.

[0009] Preferably, the fixing hole member includes a first central positioning hole and a second central positioning hole that pass through the top and bottom of the V-shaped osteotomy module, the first central positioning hole and the second central positioning hole are located in the middle of the V-shaped osteotomy module, and the first central positioning hole and the second central positioning hole are respectively located on both sides of the V-shaped osteotomy groove.

[0010] Preferably, a slot is provided at the bottom of the slide groove along the length direction of the slide groove, and the slot is provided between the bottom of the slide groove and the bottom of the slide rail, and the slot is located below the first central positioning hole and the second central positioning hole.

[0011] Preferably, the fixing hole members also include two groups of side edge positioning hole members respectively arranged on both sides of the V-shaped osteotomy module, and the side edge positioning hole members include a plurality of first side edge positioning holes and a plurality of second side edge positioning holes, and the plurality of first side edge positioning holes and the plurality of second side edge positioning holes are respectively located on both sides of the V-shaped osteotomy groove.

[0012] Preferably, a square hole is provided between the top and the bottom of the V-shaped osteotomy module, and the square hole is adapted to fit the connecting rod.

[0013] Preferably, the position measuring part includes a side scale arranged on the side wall of the connecting rod and a top scale arranged on the top of the connecting rod. A length scale line is arranged on the top of the slide rail, and the length scale line is arranged parallel to the slide groove. The side scale and top scale are arranged corresponding to the length scale line.

[0014] Preferably, the anti-slip member includes a plurality of anti-slip nails, and the plurality of anti-slip nails are fixedly connected to the bottom of the slide rail.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects: Overall, the present invention adjusts the distance between the two V-shaped osteotomy modules by moving along the same slide groove provided, and quickly determines the interval between the two V-shaped osteotomy modules through the position measuring component, and determines the position of the V-shaped osteotomy module through the position fixing hole component, so as to quickly obtain the target osteotomy length and two matching, mutually parallel V-shaped osteotomy surfaces, thereby reducing the difficulty of V-shaped osteotomy surgery for high-dislocation DDH, and achieving precise osteotomy, which is conducive to the smooth progress of the operation and the patient's postoperative recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] FIG1 is a schematic diagram of the osteotomy device of the present invention;

[0018] Figure 2 is a schematic diagram of the slide rail of the present invention;

[0019] Figure 3 is a schematic diagram of a connecting rod of the present invention;

[0020] FIG4 is a schematic diagram of a V-shaped osteotomy module of the present invention;

[0021] Among them, 1. Slide rail; 11. Slide groove; 12. Notch; 13. Anti-slip nail; 2. Connecting rod; 21. Top scale; 22. Side scale; 3. V-shaped osteotomy module; 31. Square hole; 32. First central positioning hole; 33. Second central positioning hole; 34. First side edge positioning hole; 35. Second side edge positioning hole; 36. V-shaped osteotomy groove. DETAILED DESCRIPTION

[0022] 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 embodiments described 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.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] 1 to 4 , the present invention provides a subtrochanteric extramedullary positioning V-shaped osteotomy device, comprising:

[0025] Two groups of V-shaped osteotomy modules 3 are arranged in the same direction. Both V-shaped osteotomy modules 3 are provided with position fixing holes, which are adapted to Kirschner wires. A V-shaped osteotomy groove 36 is provided between the top and bottom of the V-shaped osteotomy module 3.

[0026] The positioning assembly includes a slide rail 1, the bottom end of the slide rail 1 is provided with an anti-slip part, the top of the slide rail 1 is provided with a slide groove 11, two groups of connecting rods 2 are slidably connected in the slide groove 11, the two connecting rods 2 are vertically arranged, and a position measuring part is provided between the connecting rods 2 and the slide rail 1. Two V-shaped osteotomy modules 3 are detachably connected to the two connecting rods 2.

[0027] The main function of the position fixing hole is to allow the Kirschner wire to pass through, and to use the Kirschner wire to fix the position of the V-shaped osteotomy module 3 after the position of the V-shaped osteotomy module 3 is determined; the main function of the V-shaped osteotomy groove 36 is to limit the movement path of the small swing saw so that the osteotomy section has a consistent V-shaped section; the main function of the anti-slip part is to prevent the slide rail 1 from moving accidentally during the positioning of the V-shaped osteotomy module 3; the main function of the connecting rod 2 is to drive the V-shaped osteotomy module 3 to slide along the slide groove 11 to the appropriate position; the main function of the position measuring part is to make the two V-shaped osteotomy modules 3 at an appropriate distance by measuring the distance between the two connecting rods 2, thereby cutting off the bone segment of appropriate length. On the whole, the utility model adjusts the distance between the two V-shaped osteotomy modules by moving along the same slide groove provided, and quickly determines the interval between the two V-shaped osteotomy modules through the position measuring part, and determines the position of the V-shaped osteotomy module through the position fixing hole part, so as to quickly obtain the target osteotomy length and two matching, mutually parallel V-shaped osteotomy surfaces, thereby reducing the difficulty of V-shaped osteotomy surgery for high-dislocation DDH, and achieving accurate osteotomy, which is conducive to the smooth progress of the operation and the patient's postoperative recovery.

[0028] A further optimized solution is provided, in which the fixing hole comprises a first central positioning hole 32 and a second central positioning hole 33 which are provided between the top and bottom of the V-shaped osteotomy module 3. The first central positioning hole 32 and the second central positioning hole 33 are located in the middle of the V-shaped osteotomy module 3, and the first central positioning hole 32 and the second central positioning hole 33 are respectively located on both sides of the V-shaped osteotomy groove 36.

[0029] As a further optimized solution, as shown in FIG4 , the sizes of the first central positioning hole 32 and the second central positioning hole 33 are designed to match a 2 mm Kirschner wire.

[0030] As a further optimization solution, a slot 12 is provided at the bottom of the slide groove 11 along the length direction of the slide groove 11 , and the slot 12 is arranged between the bottom of the slide groove 11 and the bottom of the slide rail 1 , and the slot 12 is located below the first central positioning hole 32 and the second central positioning hole 33 .

[0031] As shown in FIG1 and FIG2 , the two ends of the notch 12 are respectively close to the two ends of the slide groove 11 . During the positioning process, the Kirschner wire passes through the first central positioning hole 32 or the second central positioning hole 33 and the notch 12 and is fixed to the bone surface.

[0032] As shown in FIG. 1 and FIG. 3 , the slide groove 11 is a T-shaped structure, and the bottom of the connecting rod 2 is provided with a clamping block to form a T-shaped structure adapted to the slide groove 11 .

[0033] To further optimize the solution, the fixing hole members also include two groups of side edge positioning hole members respectively arranged on both sides of the V-shaped osteotomy module 3, and the side edge positioning hole members include a number of first side edge positioning holes 34 and a number of second side edge positioning holes 35, and the number of first side edge positioning holes 34 and the number of second side edge positioning holes 35 are respectively located on both sides of the V-shaped osteotomy groove 36.

[0034] As shown in Figures 1 and 4, three groups of first side edge positioning holes 34 are provided, and two groups of second side edge positioning holes 35 are provided. During the positioning stage of the V-shaped osteotomy module 3, Kirschner wires can be used to successively penetrate the first side edge positioning holes 34 and the second side edge positioning holes 35 at appropriate positions on the left and right sides of the V-shaped osteotomy module 3 and fix them to the bone surface to achieve the positioning operation.

[0035] As a further optimization solution, the sizes of the first side edge positioning hole 34 and the second side edge positioning hole 35 are designed to match a 1.5 mm Kirschner wire.

[0036] In a further optimized solution, a square hole 31 is provided between the top and the bottom of the V-shaped osteotomy module 3 , and the square hole 31 is adapted to fit the connecting rod 2 .

[0037] As shown in Figure 1, the connecting rod 2 is a rectangular parallelepiped structure, so that the V-shaped osteotomy module 3 can be mounted on the connecting rod 2 through the square hole 31, and can ensure that the V-shaped osteotomy module 3 will not deflect relative to the slide rail 1, ensuring that the two bone surfaces cut by the two V-shaped osteotomy modules 3 match.

[0038] A further optimized solution is that the position measuring part includes a side scale 22 arranged on the side wall of the connecting rod 2 and a top scale 21 arranged on the top of the connecting rod 2. A length scale line is arranged on the top of the slide rail 1, and the length scale line is arranged parallel to the slide groove 11. The side scale 22 and the top scale 21 are arranged corresponding to the length scale line.

[0039] As shown in FIG1 and FIG3 , during use, the distance between the two connecting rods 2 can be judged by pointing the side scale 22 and the top scale 21 to the position of the length scale line.

[0040] In a further optimized solution, the anti-slip member includes a plurality of anti-slip spikes 13 , and the plurality of anti-slip spikes 13 are fixedly connected to the bottom of the slide rail 1 .

[0041] The working process of this embodiment is as follows:

[0042] First, place the slide rail 1 in the appropriate position and gently tap the four anti-slip nails 13 at the bottom of the slide rail 1 to properly secure it;

[0043] Furthermore, the bottom ends of the two connecting rods 2 are respectively inserted into the slide grooves 11 of the slide rail 1;

[0044] Furthermore, the two V-shaped osteotomy modules 3 are inserted from the top of the connecting rod 2 through the square hole 31 in the same direction;

[0045] Furthermore, the first connecting rod 2 is slid so that the V-shaped osteotomy groove 36 of the first V-shaped osteotomy module 3 is at the position of the expected distal osteotomy surface;

[0046] Further, according to the actual position, two 1.5 mm Kirschner wires are drilled into the first side edge positioning holes 34 on both sides of the first V-shaped osteotomy module 3 to fix the first V-shaped osteotomy module 3 to the bone surface;

[0047] Further, slide the second connecting rod 2, and determine the osteotomy length and the proximal osteotomy position of the V-shaped osteotomy groove 36 of the second V-shaped osteotomy module 3 by observing the length scale line and the side scale 22 and the top scale 21;

[0048] Further, according to the actual position, two 1.5 mm Kirschner wires are drilled into the second side edge positioning holes 35 on both sides of the second V-shaped osteotomy module 3 to fix the second V-shaped osteotomy module 3 to the bone surface;

[0049] Furthermore, the V-shaped osteotomy module 3, the slide rail 1 and the connecting rod 2 are removed upwards in sequence, and then the V-shaped osteotomy module 3 is re-placed on the bone surface according to the position of the Kirschner wire;

[0050] Furthermore, a 2.0 mm Kirschner wire is drilled into the first central positioning hole 32 of the first V-shaped osteotomy module 3;

[0051] Furthermore, a 2.0 mm Kirschner wire is drilled into the second central positioning hole 33 of the second V-shaped osteotomy module 3;

[0052] Further, a small oscillating saw is used to perform distal and proximal osteotomies according to the V-shaped osteotomy grooves 36 on the first V-shaped osteotomy module 3 and the second V-shaped osteotomy module 3, respectively;

[0053] Further, all tool parts are removed;

[0054] Furthermore, the bone segment between the distal and proximal osteotomy surfaces is removed;

[0055] Furthermore, the distal and proximal ends of the femur are reduced;

[0056] Furthermore, a femoral trial mold is placed into the femoral osteotomy, the hip joint is repositioned, and the stability, range of motion and tension of the soft tissue around the hip joint are checked. Attention is paid to the alignment of the subtrochanteric V-shaped osteotomy surface. If all is satisfactory, the femoral stem prosthesis can be inserted, and the remaining process is the same as conventional hip replacement surgery.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A subtrochanteric extramedullary positioning V-shaped osteotomy device, characterized in that ,include: Two groups of V-shaped osteotomy modules (3), the two V-shaped osteotomy modules (3) are arranged in the same direction, both of the V-shaped osteotomy modules (3) are provided with position fixing holes, the position fixing holes are adapted to be matched with Kirschner wires, and a V-shaped osteotomy groove (36) is provided between the top and the bottom of the V-shaped osteotomy module (3); A positioning assembly comprises a slide rail (1), the bottom end of the slide rail (1) is provided with an anti-slip part, the top of the slide rail (1) is provided with a slide groove (11), two groups of connecting rods (2) are slidably connected in the slide groove (11), the two connecting rods (2) are vertically arranged, a position measuring part is provided between the connecting rods (2) and the slide rail (1), and the two V-shaped osteotomy modules (3) are detachably connected to the two connecting rods (2).

2. A subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 1, characterized in that: The fixing hole member comprises a first central positioning hole (32) and a second central positioning hole (33) which are arranged between the top and the bottom of the V-shaped osteotomy module (3); the first central positioning hole (32) and the second central positioning hole (33) are located in the middle of the V-shaped osteotomy module (3), and the first central positioning hole (32) and the second central positioning hole (33) are respectively located on both sides of the V-shaped osteotomy groove (36).

3. A subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 2, characterized in that: The bottom of the slide groove (11) is provided with a notch (12) along the length direction of the slide groove (11), and the notch (12) is arranged between the bottom of the slide groove (11) and the bottom of the slide rail (1), and the notch (12) is located below the first central positioning hole (32) and the second central positioning hole (33).

4. The subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 2, characterized in that: The fixing hole components also include two groups of side edge positioning hole components respectively arranged on both sides of the V-shaped osteotomy module (3), and the side edge positioning hole components include a plurality of first side edge positioning holes (34) and a plurality of second side edge positioning holes (35), and the plurality of first side edge positioning holes (34) and the plurality of second side edge positioning holes (35) are respectively located on both sides of the V-shaped osteotomy groove (36).

5. The subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 1, characterized in that: A square hole (31) is provided between the top and the bottom of the V-shaped osteotomy module (3), and the square hole (31) is adapted to fit the connecting rod (2).

6. The subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 1, characterized in that: The position measuring component comprises a side scale (22) arranged on the side wall of the connecting rod (2) and a top scale (21) arranged on the top of the connecting rod (2); a length scale line is arranged on the top of the slide rail (1), and the length scale line is arranged parallel to the slide groove (11); the side scale (22) and the top scale (21) are arranged corresponding to the length scale line.

7. The subtrochanteric extramedullary positioning V-shaped osteotomy device according to claim 1, characterized in that: The anti-skid component comprises a plurality of anti-skid studs (13), and the plurality of anti-skid studs (13) are fixedly connected to the bottom of the slide rail (1).

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