A hip joint femoral prosthesis removal tool

Abstract

The present invention provides a hip joint femoral prosthesis removal tool, which includes a buckle ring and an L-shaped rod, wherein the buckle ring includes a circular ring body, a circular ring opening, a first screw and a second screw, wherein the first screw and the second screw are arranged at the circular ring opening, and the L-shaped rod includes a clamping portion, a connecting rod and a knocking portion. In the present invention, the buckle ring is fixed by a screw, and can be tightly engaged with the collar of the femoral prosthesis, thereby increasing the contact area with the collar of the femoral prosthesis, and the arc transition and extension of the L-shaped rod make the force line consistent with the removal axis, thereby facilitating the removal of the handle.

Description

Technical Field

[0001] The invention relates to the technical field of surgical instruments, in particular to a hip joint femoral prosthesis removal tool. Background Art

[0002] In recent years, hip revision surgery has increased significantly, and revision technology has become a hot topic of concern for many orthopedic surgeons. The first step of revision surgery is to remove the failed prosthesis. The perfect prosthesis removal technology should achieve the following two goals: completely remove the prosthesis and bone cement while minimizing damage to the bone structure; retain bone volume as much as possible to prevent iatrogenic bone defects. With the advancement of surgical instruments and surgical techniques, there are many ways to remove the prosthesis, and the methods chosen by each doctor are different. The key points of total hip prosthesis removal are the loosening of the prosthesis-bone cement or prosthesis-bone interface and the removal of bone cement. Unlike total knee prostheses, total hip prostheses are contained in the femoral medullary cavity and acetabulum, and the interface loosening is more difficult. The different shapes, surface treatments and fixation methods of the prostheses bring many obstacles to the removal of the prostheses. In order to remove these prostheses, various types of revision tools need to be prepared before surgery in case of emergency.

[0003] Currently, the method for removing the femoral stem prosthesis includes the following steps:

[0004] 1. Remove scars, bone cement and protruding bone tissue that block the removal of the prosthesis at the medullary cavity opening, and pay special attention to removing obstacles at the shoulder of the prosthesis to reduce the risk of greater trochanter fracture;

[0005] 2. After the prosthesis is completely loosened, use the femoral prosthesis extractor to remove the femoral prosthesis. If the prosthesis is still difficult to remove after extensive loosening, a distal window can be opened and a reverse tapper can be used to remove the prosthesis. If the prosthesis cannot be removed, it can only be removed by osteotomy.

[0006] When using traditional tools to tap the femoral stem, the magnitude and direction of the tapping force are very uncertain, which can easily cause damage to the human femur due to unstable force application, causing secondary injury to the patient, thereby increasing the complexity of the operation, prolonging the operation time, and reducing the success rate of the operation. Summary of the invention

[0007] In order to solve the technical problem of difficulty in removing the femoral stem in the prior art, the hip joint femoral prosthesis removal tool proposed by the present invention comprises a buckle ring and an L-shaped rod;

[0008] The buckle ring comprises a circular ring body, a circular ring opening, a first screw and a second screw, wherein the first screw and the second screw are arranged at the circular ring opening;

[0009] The L-shaped rod comprises a clamping portion, a connecting rod and a knocking portion.

[0010] Preferably, the material of the body is stainless steel, and the material of the opening is carbon spring steel.

[0011] Preferably, the thickness of the buckle is 2 mm, the diameter of the circular ring body is 10-15 mm, the width of the circular ring opening is 5-8 mm, and the length is 15-20 mm.

[0012] Preferably, the clamping portion is an arc with an arc angle of 120-150°.

[0013] Preferably, the connecting rod includes a first straight portion, a transverse portion and a second straight portion.

[0014] Preferably, the length of the first straight portion is 5 cm, the length of the transverse portion is 5 cm, and the length of the second straight portion is 10-15 cm.

[0015] Preferably, there is a 120° arc transition between the first straight portion and the transverse portion, and there is also a 120° arc transition between the transverse portion and the second straight portion.

[0016] Preferably, the striking part is a cylindrical pier.

[0017] Preferably, the L-shaped rod is made of stainless steel and has a cross-sectional diameter of 1.5-2.5 cm.

[0018] Preferably, the method for using the hip joint femoral prosthesis removal tool is as follows:

[0019] S1, making the buckle ring surround the collar of the femoral prosthesis along the circular opening, and fixing the buckle ring with double screws;

[0020] S2. Attach the L-shaped rod to the joint between the buckle and the collar of the prosthesis, and adjust the direction of the L-shaped rod to avoid interference from the muscles and fat at the upper end of the femur;

[0021] S3. Knock the knocking part at the end of the L-shaped rod along the removal axis to successfully remove the femoral stem prosthesis.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The retaining ring is fixed by screws and can be tightly engaged with the collar of the femoral prosthesis, thereby increasing the contact area with the collar of the femoral prosthesis. In addition, the arc transition and extension of the L-shaped rod make the force line consistent with the removal axis, making it easier to remove the handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the buckle of the present invention;

[0025] Figure 2 is a side view of the L-shaped rod of the present invention;

[0026] Figure 3 It is a front view of the L-shaped rod of the present invention.

[0027] In the figure, 11-annular body, 12-annular opening, 13-first screw, 14-second screw, 21-clamping portion, 22-connecting rod, 221-first straight portion, 222-transverse portion, 223-second straight portion, 23-knocking portion. Implementation

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0029] The hip joint femoral prosthesis removal tool provided by the present invention comprises a buckle ring and an L-shaped rod.

[0030] like Figure 1 As shown, the buckle ring includes a circular ring body 11, a circular ring opening 12, a first screw 13 and a second screw 14. The material of the body 11 is stainless steel. The material of the opening 12 is carbon spring steel, which is convenient for embedding the collar of the femoral prosthesis into the circular ring body. The first screw 13 and the second screw 14 are arranged at the circular ring opening to fix the buckle ring. Specifically, the thickness of the buckle ring is 2mm, the diameter of the circular ring body is 10-15mm, and it has different specifications and sizes, and the width of the circular ring opening is 5-8mm, and the length is 15-20mm, and it has different specifications and sizes.

[0031] like Figure 2 and Figure 3 As shown, the L-shaped rod includes a clamping portion 21, a connecting rod 22 and a striking portion 23. The clamping portion 21 is an arc with an arc of 120-150°, with different sizes and specifications, and is used to clamp the buckle. The connecting rod 22 includes a first straight portion 221, a transverse portion 222, and a second straight portion 223. The length of the first straight portion is 5 cm, the length of the transverse portion is 5 cm, and the length of the second straight portion is 10-15 cm, with different sizes and specifications. There is a 120° arc transition between the first straight portion and the transverse portion, which is used to bypass the muscle and fat barriers at the upper end of the femur. There is also a 120° arc transition between the transverse portion and the second straight portion. The striking portion 23 is a cylindrical pier, which serves as a hammer striking position. The material of the L-shaped rod is stainless steel, with a cross-sectional diameter of 1.5-2.5 cm, and has different sizes and specifications.

[0032] The hip femoral prosthesis extraction tool is used as follows:

[0033] S1. Make the retaining ring surround the collar of the femoral prosthesis along the circular opening, and fix the retaining ring with double screws.

[0034] S2. Clip the L-shaped rod's clip-on part to the joint between the buckle and the prosthesis collar, and adjust the direction of the L-shaped rod to avoid interference from the muscles and fat at the upper end of the femur.

[0035] S3. Knock the knocking part at the end of the L-shaped rod along the removal axis to successfully remove the femoral stem prosthesis.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The retaining ring is fixed by screws and can tightly engage with the collar of the femoral prosthesis, increasing the contact area with the collar of the femoral prosthesis and avoiding direct knocking on the collar step, which may cause the collar step to flatten and increase the risk of tool slippage later. In addition, the arc-shaped transition and extension of the L-shaped rod make the force line consistent with the removal axis, making it easier to remove the handle.

[0038] The above disclosure is only the preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the present invention. It should be pointed out that for those skilled in the art, any equivalent changes made to the scheme of the present invention without departing from the design structure and principle of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A hip joint femoral prosthesis removal tool, characterized in that ,The hip joint femoral prosthesis removal tool includes a buckle and an L-shaped rod; The buckle ring comprises a circular ring body, a circular ring opening, a first screw and a second screw, wherein the first screw and the second screw are arranged at the circular ring opening; The L-shaped rod comprises a clamping portion, a connecting rod and a knocking portion; The materials of the circular ring body and the L-shaped rod are both stainless steel.

2. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The material of the circular ring opening is carbon spring steel.

3. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The thickness of the buckle ring is 2 mm, the diameter of the circular ring body is 10-15 mm, the width of the circular ring opening is 5-8 mm, and the length is 15-20 mm.

4. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The clamping portion is an arc with an arc angle of 120-150°.

5. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The connecting rod includes a first straight portion, a transverse portion and a second straight portion.

6. The hip joint femoral prosthesis removal tool according to claim 5, characterized in that: The length of the first straight portion is 5 cm, the length of the transverse portion is 5 cm, and the length of the second straight portion is 10-15 cm.

7. The hip joint femoral prosthesis removal tool according to claim 5, characterized in that: There is a 120° arc transition between the first straight portion and the transverse portion, and there is also a 120° arc transition between the transverse portion and the second straight portion.

8. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The striking part is a cylindrical pier.

9. The hip joint femoral prosthesis removal tool according to claim 1, characterized in that: The cross-sectional diameter of the L-shaped rod is 1.5-2.5 cm.

10. The hip joint femoral prosthesis removal tool according to any one of claims 1 to 9, characterized in that: The method of using the hip joint femoral prosthesis removal tool is as follows: S1, making the buckle ring surround the collar of the femoral prosthesis along the circular opening, and fixing the buckle ring with double screws; S2. Attach the L-shaped rod to the joint between the buckle and the collar of the prosthesis, and adjust the direction of the L-shaped rod to avoid interference from the muscles and fat at the upper end of the femur; S3. Knock the knocking part at the end of the L-shaped rod along the removal axis to successfully remove the femoral stem prosthesis.

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