Universal joint screw for fixing acetabular prosthesis and use method of universal joint screw

Abstract

The invention is suitable for the technical field of medical instruments, and provides a universal joint screw for fixing an acetabular prosthesis and a using method thereof.The universal joint screw comprises a main body assembly and a connecting assembly, the main body assembly comprises a screw body and a self-tapping head, and the connecting assembly comprises a first fixing block, a first connecting base, a universal joint, a second connecting base and a second fixing block; the first fixing block and the second fixing block are respectively connected with the screw body and the self-tapping head; the first connecting seat and the second connecting seat are both connected with the universal joint; the universal joint is movably connected with the first connecting base and the second connecting base in a multi-angle rotating mode and used for adjusting the relative position of the screw body and the self-tapping head in the screw screwing-in process. The universal joint is constructed in the long acetabular screw, long-distance fixing of the long screw perpendicular to the acetabular prosthesis is achieved, the mechanical stability of the acetabular prosthesis is improved, the fixing failure risk is reduced, the reoperation probability is reduced, reliable fixing of the rebuilt acetabular prosthesis can be rapidly and accurately completed, the operation efficiency is improved, and postoperative rehabilitation of a patient is accelerated.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a universal joint screw for fixing acetabular prostheses and its usage method. Background Technology

[0002] Acetabular revision surgery is a procedure used to repair or replace a worn or damaged acetabular prosthesis, typically performed after hip replacement surgery when prosthesis loosening, infection, dislocation, or other complications occur. During revision surgery, screws are used to secure the acetabular prosthesis.

[0003] However, existing screws have some problems in practical use: to provide maximum compressive force and achieve the most stable fixation, the screw needs to be inserted perpendicular to the acetabulum. But due to the screw's long length, the limited space within the acetabulum, and the obstruction of soft tissue in the surgical field, perpendicular insertion cannot be achieved in actual operation. To address these problems, this invention proposes a universal joint screw for acetabular prosthesis fixation and its method of use. Summary of the Invention

[0004] The purpose of this invention is to provide a universal joint screw for fixing an acetabular prosthesis and its method of use, aiming to solve the problems mentioned in the background art.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A universal joint screw for fixing an acetabular prosthesis, comprising:

[0007] The main component includes a screw body and a self-tapping head;

[0008] A connecting assembly includes a first fixing block, a first connecting seat, a universal joint, a second connecting seat, and a second fixing block. The first fixing block is fixedly disposed on the inner end of the screw body, and the second fixing block is fixedly disposed on the inner end of the self-tapping head. The first connecting seat is fixedly disposed on the inner edge of the first fixing block, and the second connecting seat is fixedly disposed on the inner edge of the second fixing block. Both the first and second connecting seats are connected to the universal joint. The universal joint is movably connected to the first and second connecting seats in a manner that enables multi-angle rotation, and is used to adjust the relative position of the screw body and the self-tapping head during screw insertion.

[0009] Furthermore, the universal joint is a cross universal joint.

[0010] Furthermore, the first connector and the second connector are installed alternately; the two connecting ears of the first connector protrude from the front and rear edges and have pin holes; the two connecting ears of the second connector protrude from the upper and lower edges and have pin holes.

[0011] Furthermore, the connecting assembly also includes a second connecting pin and a first connecting pin, the second connecting pin being used to connect the universal joint to the second connecting seat, and the first connecting pin being used to connect the universal joint to the first connecting seat.

[0012] Furthermore, the universal joint has a through hole for the second connecting pin to pass through, the through hole extending through the upper and lower ends of the universal joint, and mounting holes for the first connecting pin to be inserted are provided on both the front and rear sides of the universal joint.

[0013] Furthermore, the second connecting pin passes through the pin holes on the two connecting ears of the second connecting seat and the through hole in the universal joint, and the two ends of the second connecting pin are respectively fixed to the two connecting ears of the second connecting seat by welding; the two first connecting pins pass through the pin holes on the two connecting ears of the first connecting seat and are inserted into the front and rear mounting holes of the universal joint, and the ends of the two first connecting pins are respectively fixed to the two connecting ears of the first connecting seat by welding.

[0014] Furthermore, the outer surface of the screw body near the self-tapping head and the entire outer surface of the self-tapping head are equidistantly threaded; an internal hexagonal hole is opened at the center of the outer end of the screw body.

[0015] A method of using the universal joint screw as described above includes the following steps:

[0016] First, a hole is drilled in the acetabular prosthesis using a special drill bit. Then, an external hex wrench is used to screw the universal joint screw used for fixing the acetabular prosthesis into the hole. By moving the screw body and the self-tapping head, the universal joint screw is bent through the universal joint, so that the front half of the screw is smoothly screwed into the acetabular bone perpendicular to the acetabular cup. After the connection between the screw body and the self-tapping head enters the acetabular bone, the universal joint angle is adjusted so that the rear half of the universal joint screw is perpendicular to the acetabular cup, and the universal joint screw is continued to be screwed in, so that the rear half of the universal joint screw enters the acetabular bone.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention achieves long-distance fixation of the long acetabular prosthesis perpendicular to it by constructing a universal joint within the long acetabular screw, thereby improving the mechanical stability of the acetabular prosthesis, reducing the risk of fixation failure, and decreasing the likelihood of reoperation. At the same time, it can quickly and accurately complete reliable fixation of the revision acetabular prosthesis, improve surgical efficiency, and accelerate postoperative recovery for patients. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is a perspective view of the connecting component in this invention.

[0021] Figure 3 This is an assembly diagram of the universal joint and the second connecting pin in this invention.

[0022] Figure 4 This is an exploded view of the connecting component in this invention.

[0023] In the diagram: 11-screw body; 12-self-tapping head; 21-first fixing block; 22-first connecting seat; 23-universal joint; 231-mounting hole; 232-through hole; 24-second connecting pin; 25-first connecting pin; 26-second connecting seat; 27-second fixing block. Detailed Implementation

[0024] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] like Figures 1-4 As shown, one embodiment of the present invention provides a universal joint screw for fixing an acetabular prosthesis and a method of using the same, comprising:

[0027] The main component includes a screw body 11 and a self-tapping head 12; the outer surface of the screw body 11 near the self-tapping head 12 and the entire outer surface of the self-tapping head 12 are equidistantly threaded, which are used to realize threaded connection and locking functions; an internal hexagonal hole is opened at the center of the outer end of the screw body 11, which can be used with an external hexagonal head tool to facilitate the application of torque and realize convenient screwing and fixing operations.

[0028] The connecting component includes a first fixing block 21, a first connecting seat 22, a universal joint 23, a second connecting seat 26, and a second fixing block 27.

[0029] The first fixing block 21 is fixedly disposed on the inner end of the screw body 11, and the second fixing block 27 is fixedly disposed on the inner end of the self-tapping head 12. The first fixing block 21 and the second fixing block 27 serve to connect the screw body 11 and the self-tapping head 12.

[0030] The first connecting seat 22 is fixedly disposed at the inner edge of the first fixing block 21, and the second connecting seat 26 is fixedly disposed at the inner edge of the second fixing block 27. Both the first connecting seat 22 and the second connecting seat 26 are connected to the universal joint 23 and can move relative to the universal joint 23.

[0031] The universal joint 23 is movably connected to the first connecting seat 22 and the second connecting seat 26 in a manner that enables multi-angle rotation, and is used to adjust the relative position of the screw body 11 and the self-tapping head 12 during screw tightening. The universal joint 23 is a cross universal joint 23.

[0032] In this embodiment of the invention, during use, the physician first drills one or more small holes in the acetabular prosthesis using a special drill bit. Then, using an external hex wrench, the universal joint screws used for acetabular prosthesis fixation are screwed into these holes one by one. Through the movable screw body 11 and the self-tapping head 12, the universal joint screw is bent through the universal joint 23. This "bent" state allows the front half of the universal joint screw to be smoothly screwed into the acetabular bone perpendicular to the acetabular cup. After the connecting part between the screw body 11 and the self-tapping head 12 enters the acetabular bone, the angle of the universal joint 23 is adjusted to make the rear half of the universal joint screw perpendicular to the acetabular cup, and the universal joint screw is continued to be screwed in, allowing the rear half of the universal joint screw to enter the acetabular bone. This design not only enables effective placement of the universal joint screw into the proximal acetabular bone but also improves the stability of the acetabular prosthesis and reduces the risk of acetabular prosthesis fixation failure. Through the above steps, the functionality of the universal joint screw is significantly improved, providing a more reliable guarantee for achieving accurate acetabular fixation, i.e., the success of acetabular revision surgery.

[0033] like Figures 2-4 As shown, in a preferred embodiment of the present invention, the first connecting seat 22 and the second connecting seat 26 are installed alternately. Specifically, the two connecting ears of the first connecting seat 22 protrude from the front and rear edges and have pin holes; the two connecting ears of the second connecting seat 26 protrude from the upper and lower edges and have pin holes. This alternately arranged connecting ear structure facilitates the movable connection between the first connecting seat 22 and the universal joint 23, and the movable connection between the second connecting seat 26 and the universal joint 23, through connecting parts such as pins.

[0034] like Figures 2-4 As shown, in a preferred embodiment of the present invention, the connecting assembly further includes a second connecting pin 24 and a first connecting pin 25. The second connecting pin 24 is used to connect the universal joint 23 to the second connecting seat 26, and the first connecting pin 25 is used to connect the universal joint 23 to the first connecting seat 2.

[0035] The universal joint 23 has a through hole 232 for the second connecting pin 24 to pass through. The through hole 232 passes through the upper and lower ends of the universal joint 23. The universal joint 23 has mounting holes 231 on both the front and rear sides for the first connecting pin 25 to be inserted.

[0036] The second connecting pin 24 passes through the pin holes on the two connecting ears of the second connecting seat 26 and the through hole 232 in the universal joint 23, and the two ends of the second connecting pin 24 are respectively fixed to the two connecting ears of the second connecting seat 26 by welding;

[0037] The two first connecting pins 25 pass through the pin holes on the two connecting ears of the first connecting seat 22 and are inserted into the front and rear mounting holes 231 of the universal joint 23. The ends of the two first connecting pins 25 are fixed to the two connecting ears of the first connecting seat 22 by welding.

[0038] In this embodiment of the invention, by providing connecting ears, it is convenient for the second connecting pin 24 to connect the second connecting seat 26 to the universal joint 23, and for the first connecting pin 25 to connect the first connecting seat 22 to the universal joint 23, so that the first connecting seat 22 drives the screw body 11 to move through the first connecting pin 25, and the second connecting seat 26 drives the self-tapping head 12 to move through the second connecting pin 24.

[0039] The working principle of this invention is:

[0040] When using this universal joint screw, the doctor first drills one or more small holes in the acetabular prosthesis using a special drill bit. Then, using an external hex wrench, the universal joint screws used for acetabular prosthesis fixation are screwed into these holes one by one. By moving the screw body 11 and the self-tapping head 12, the universal joint screw is bent through the universal joint 23. This "bent" state allows the front half of the universal joint screw to be screwed into the acetabular bone perpendicular to the acetabular cup. After the connecting part between the screw body 11 and the self-tapping head 12 enters the acetabular bone, the angle of the universal joint 23 is adjusted to make the rear half of the universal joint screw perpendicular to the acetabular cup, and the universal joint screw is continued to be screwed in, so that the rear half of the universal joint screw enters the acetabular bone, achieving long-distance fixation of the screw.

[0041] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A universal joint screw for fixing an acetabular prosthesis, characterized in that, include: The main component includes a screw body and a self-tapping head; A connecting assembly includes a first fixing block, a first connecting seat, a universal joint, a second connecting seat, and a second fixing block. The first fixing block is fixedly disposed on the inner end of the screw body, and the second fixing block is fixedly disposed on the inner end of the self-tapping head. The first connecting seat is fixedly disposed on the inner edge of the first fixing block, and the second connecting seat is fixedly disposed on the inner edge of the second fixing block. Both the first and second connecting seats are connected to the universal joint. The universal joint is movably connected to the first and second connecting seats in a manner that enables multi-angle rotation, and is used to adjust the relative position of the screw body and the self-tapping head during screw insertion.

2. The universal joint screw according to claim 1, characterized in that, The universal joint is a cross universal joint.

3. The universal joint screw according to claim 1, characterized in that, The first connector and the second connector are installed alternately; the two connecting ears of the first connector protrude from the front and rear edges and have pin holes; the two connecting ears of the second connector protrude from the upper and lower edges and have pin holes.

4. The universal joint screw according to claim 3, characterized in that, The connecting assembly further includes a second connecting pin and a first connecting pin, wherein the second connecting pin is used to connect the universal joint to the second connecting seat, and the first connecting pin is used to connect the universal joint to the first connecting seat.

5. The universal joint screw according to claim 4, characterized in that, The universal joint has a through hole for the second connecting pin to pass through, and the through hole extends through the upper and lower ends of the universal joint. The universal joint also has mounting holes on its front and rear sides for the first connecting pin to be inserted.

6. The universal joint screw according to claim 5, characterized in that, The second connecting pin passes through the pin holes on the two connecting ears of the second connecting seat and the through hole in the universal joint, and the two ends of the second connecting pin are respectively fixed to the two connecting ears of the second connecting seat by welding; the two first connecting pins pass through the pin holes on the two connecting ears of the first connecting seat and are inserted into the front and rear mounting holes of the universal joint, and the ends of the two first connecting pins are respectively fixed to the two connecting ears of the first connecting seat by welding.

7. The universal joint screw according to claim 1, characterized in that, The outer surface of the screw body near the self-tapping head and the entire outer surface of the self-tapping head are equidistantly threaded; an internal hexagonal hole is opened at the center of the outer end of the screw body.

8. A method of using a universal joint screw according to any one of claims 1-7, characterized in that, Includes the following steps: First, a hole is drilled in the acetabular prosthesis using a special drill bit. Then, an external hex wrench is used to screw the universal joint screw used for fixing the acetabular prosthesis into the hole. By moving the screw body and the self-tapping head, the universal joint screw is bent through the universal joint, so that the front half of the screw is smoothly screwed into the acetabular bone perpendicular to the acetabular cup. After the connection between the screw body and the self-tapping head enters the acetabular bone, the universal joint angle is adjusted so that the rear half of the universal joint screw is perpendicular to the acetabular cup, and the universal joint screw is continued to be screwed in, so that the rear half of the universal joint screw enters the acetabular bone.

Images