CN115869114A

CN115869114A - Cartilage prosthesis

Info

Publication number: CN115869114A
Application number: CN202310047285.3A
Authority: CN
Inventors: 王亚松; 张帅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2023-03-31
Anticipated expiration: 2043-01-31
Also published as: CN115869114B

Abstract

The invention provides a cartilage prosthesis comprising: the main body is conical, a groove is formed in the conical surface, and a threaded hole is formed in the conical top; the clamping jaws are correspondingly inserted into the grooves of the main body and are provided with a recovery position capable of being assembled and an extending position for realizing long-term fixation; the guide nail is provided with an external thread matched with the threaded hole of the main body, and the outer wall of the guide nail is provided with an anti-rotation ridge; the rotary shaft penetrates through the circular through hole of the clamping jaw and is inserted into the groove of the main body. By applying the technical scheme of the invention, in the process of repairing the articular cartilage damage, the cartilage prosthesis can automatically extend into human bones to realize long-term fixation, the appearance of the upper end surface of the prosthesis simulates the appearance of bone defect, and meanwhile, PMPC material is grafted to simulate the articular cartilage surface to realize the purpose of repairing the articular cartilage damage.

Description

Cartilage prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a cartilage prosthesis.

Background

The lubricating device for the natural joint mainly comprises an articular cartilage as a core, and the articular cartilage comprises an articular surface, an articular cavity, an articular capsule and the like, wherein the articular cartilage is attached to the articular end, and the characteristic of high elasticity of the articular cartilage provides a good basis for joint lubrication.

The joint cartilage injury is a common orthopedic disease, is mostly caused by trauma, osteoarthritis, joint operation side injury and the like, and is mainly clinically manifested as joint pain and movement dysfunction. If acute injury occurs and the treatment is not timely carried out due to the limited self-repairing capacity of the cartilage tissue, the degeneration of the cartilage tissue is obviously accelerated, and traumatic arthritis and even osteoarthritis are induced. On the other hand, with the increasing aging situation of the Chinese population, the incidence rate of osteoarthritis is increasing, and the incidence probability of cartilage damage is greatly increased.

Aiming at the problems, the invention provides a cartilage prosthesis, which is matched with cartilage prostheses of different models according to the size of a wound of cartilage injury, and claws arranged on the prosthesis can be extended and inserted into bones of a human body, so that long-term fixation is realized, and the aim of repairing the articular cartilage injury is fulfilled.

Disclosure of Invention

The invention provides a cartilage prosthesis, which aims to solve the problem of articular cartilage damage in the related art.

The invention provides a cartilage prosthesis comprising: the main body is conical, a groove is formed in the conical surface, and a threaded hole is formed in the conical top; the clamping jaws are correspondingly inserted into the grooves of the main body and are provided with a recovery position capable of being assembled and an extending position for realizing long-term fixation; the guide nail is provided with an external thread matched with the threaded hole of the main body, and the outer wall of the guide nail is provided with an anti-rotation ridge; the rotary shaft penetrates through the circular through hole of the clamping jaw and is inserted into the groove of the main body.

Further, the upper end surface of the main body is customized according to the shape of the bone defect of the cartilage damage.

Furthermore, the main body is made of polyethylene materials, and other parts are made of titanium alloy materials.

Further, the upper end face of the main body is grafted with poly 2-methacryloyloxyethyl phosphorylcholine (PMPC) to the surface of a polyethylene material through photoinduced polymerization to form a nano-scale surface modified simulated articular cartilage surface.

Furthermore, the side wall of the groove is provided with a round blind hole, and a rotating shaft is inserted into the blind hole; the screw hole is a blind hole for the guide nail to screw in.

Furthermore, the jack catch is provided with a circular through hole, is inserted with the rotating shaft and is assembled in the groove of the main body.

Further, the claws are in the retracted position at the time of assembly, and the claws abut against the human bone and rotate to the extended position as the cartilage prosthesis is assembled into the human bone.

Furthermore, the guide nails are provided with different lengths, the assembly lengths extending into human bones can be adjusted, and friction forces with different sizes are provided for the cartilage prosthesis after assembly to realize long-term fixation.

Furthermore, the upper end of the guide nail is provided with an external thread which is matched with the threaded hole of the main body; the outer wall is provided with an anti-rotation ridge which extends into the human bone along with the guide nail to play a role in preventing the guide nail from rotating.

Furthermore, the rotating shaft is cylindrical and is used as a rotating center of the clamping jaw to penetrate through the circular through hole of the clamping jaw to provide a rotating center for the clamping jaw.

Applying the technical scheme of the invention, the cartilage prosthesis comprises: the joint cartilage damage repairing device comprises a main body, clamping jaws, guide nails and a rotating shaft, wherein in the repairing process of joint cartilage damage, the cartilage prosthesis can automatically extend into a human bone to realize long-term fixation, the appearance of the upper end surface of the prosthesis simulates the appearance of bone defect, and meanwhile, PMPC materials are grafted to simulate the surface of the joint cartilage to realize the purpose of repairing the joint cartilage damage.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a cross-sectional view of a cartilage prosthesis provided according to an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the body of FIG. 1;

FIG. 3 shows a schematic structural view of the body of FIG. 1;

FIG. 4 shows a cross-sectional view of the pawl of FIG. 1;

FIG. 5 shows a schematic view of the jaw of FIG. 1;

FIG. 6 shows a schematic structural view of the guide pin of FIG. 1;

FIG. 7 shows a top view of the guide pin of FIG. 1;

fig. 8 shows a schematic view of the structure of the rotating shaft in fig. 1.

Wherein the figures include the following reference numerals:

10. a main body; 11. a groove; 12. a circular blind hole; 13. a threaded hole; 14. an upper end surface;

20. a claw; 21. a circular through hole;

30. a guide pin; 31. an external thread; 32. anti-rotation ridges;

40. a rotating shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention provides a cartilage prosthesis comprising: the main body 10 is conical, a groove 11 is formed in the conical surface, and a threaded hole 13 is formed in the conical top; the claw 20 is correspondingly inserted into the groove 11 of the main body 10 and has a recovery position capable of being assembled and an extending position for realizing long-term fixation; a guide pin 30 provided with an external thread 31 matching with the threaded hole 13 of the main body 10, and an outer wall provided with an anti-rotation ridge 32; the rotating shaft 40, which is inserted into the circular through hole 21 of the claw 20, is inserted into the groove 11 of the main body.

Applying the technical scheme of the invention, the cartilage prosthesis comprises: the joint cartilage damage repairing device comprises a main body 10, a clamping jaw 20, a guide nail 30 and a rotating shaft 40, wherein in the repairing process of joint cartilage damage, the cartilage prosthesis can automatically extend into a human bone to realize long-term fixation, the appearance of the upper end face of the prosthesis simulates the appearance of bone defect, and PMPC material is grafted to simulate the surface of joint cartilage to realize the purpose of repairing the joint cartilage damage.

As shown in fig. 2 to 3, the shape of the upper end surface 14 of the body 10 is customized according to the shape of a bone defect of cartilage damage, simulating the shape of normal articular cartilage; the side wall of the groove 11 of the main body 10 is provided with a round blind hole 12 in which the rotating shaft 40 is inserted; the conical top of the main body 10 is provided with a threaded hole 13 which is matched with the external thread 31 of the guide nail 30.

Wherein, the main body is made of polyethylene material, which is convenient for further surface modification; other parts are made of titanium alloy materials, and have good mechanical properties and biocompatibility.

It should be noted that, the upper end surface 14 of the main body 10 is formed by grafting poly 2-methacryloyloxyethyl phosphorylcholine (PMPC) onto the surface of the polyethylene material through photoinduced polymerization to form a nano-scale surface-modified simulated articular cartilage surface.

As shown in fig. 4 to 5, the jaw 20 is provided with a circular through hole 21, into which the rotating shaft 40 is inserted, and is fitted in the groove 11 of the main body 10; when the claws 20 are in the retracted position during assembly, the claws abut against the human bone and rotate to the extended position as the cartilage prosthesis is assembled into the human bone.

As shown in fig. 6 to 7, the guide pins 30 are provided with different lengths, so that the assembly length of the guide pins extending into the bone of a human can be adjusted, and friction forces with different sizes can be provided for the cartilage prosthesis after assembly to realize long-term fixation; the upper end of the guide nail 30 is provided with an external thread 31 which is matched with the threaded hole 13 of the main body 10; the outer wall is provided with an anti-rotation ridge 32 which extends into the bone along with the guide nail 30 to prevent the guide nail 30 from rotating.

As shown in fig. 8, the rotating shaft is cylindrical and is used as a rotating center of the clamping jaw, and penetrates through the circular through hole of the clamping jaw to provide a rotating center for the clamping jaw.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cartilage prosthesis, comprising:

the main body (10) is conical, a groove (11) is arranged on the conical surface, and a threaded hole (13) is arranged at the top of the conical surface;

the clamping jaws (20) are correspondingly inserted into the grooves (11) of the main body (10) and are provided with a recovery position capable of being assembled and an extending position for realizing long-term fixation;

the guide nail (30) is provided with an external thread (31) matched with the threaded hole (13) of the main body (10), and the outer wall of the guide nail is provided with an anti-rotation ridge (32);

the rotating shaft (40) penetrates through the circular through hole (21) of the clamping jaw (20) and is inserted into the groove (11) of the main body.

2. A cartilage prosthesis according to claim 1 characterized in that the profile of the upper end surface (14) of the body (10) is custom produced according to the bone defect profile of a cartilage lesion.

3. A cartilage prosthesis according to claim 1 characterized in that the body (10) is made of polyethylene and the other parts are made of titanium alloy.

4. The cartilage prosthesis according to claim 1, wherein the upper end face (14) of the body (10) is formed by grafting poly-2-methacryloyloxyethyl phosphorylcholine (PMPC) onto the surface of a polyethylene material by light-induced polymerization to form a nano-scale surface-modified simulated articular cartilage surface.

5. The cartilage prosthesis according to claim 1, characterized in that the side walls of the groove (11) are provided with blind circular holes (12) in which the shaft (40) is inserted; the threaded hole (13) is a blind hole for the guide nail (30) to be screwed in.

6. Cartilage prosthesis according to claim 1, characterized in that the jaws (20) are provided with circular through holes (21) inserted by the shaft (40) and fitted in the grooves (11) of the body (10).

7. A cartilage prosthesis according to claim 1 characterised in that the jaws (20) are in a retracted position during assembly and that the jaws (20) are rotated to an extended position against the bone following assembly of the cartilage prosthesis into the bone.

8. A cartilage prosthesis according to claim 1, characterized in that the guide pins (30) are provided with different lengths, the fitting length for insertion into the human bone being adjustable, and after fitting, different amounts of friction are provided for the cartilage prosthesis for the purpose of achieving a long-term fixation.

9. The cartilage prosthesis according to claim 1, wherein the guide pin (30) has an external thread (31) at its upper end for engaging with the threaded hole (13) of the body (10); the outer wall is provided with an anti-rotation ridge (32) which extends into the human bone along with the guide nail (30) to prevent the guide nail (30) from rotating.

10. The cartilage prosthesis according to claim 1, wherein the rotating shaft (40) is cylindrical and is arranged in the circular through hole (21) of the clamping jaw (20) as a rotating center of the clamping jaw (20) to provide a rotating center for the clamping jaw (20).