CN214342807U

CN214342807U - Wrist joint prosthesis capable of effectively avoiding falling

Info

Publication number: CN214342807U
Application number: CN202023202028.3U
Authority: CN
Inventors: 许庆菊; 赵雅丽; 尤巧娟
Original assignee: SHANGHAI PUWEI MEDICAL APPARATUS FACTORY CO Ltd
Current assignee: SHANGHAI PUWEI MEDICAL APPARATUS FACTORY CO Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-08
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to the field of medical equipment, especially, relate to a wrist joint prosthesis that can effectively avoid droing, including connection prosthesis and radius prosthesis, connection prosthesis includes the bulge ball, be fixed with the fixed column fixed with the metacarpal bone cooperation on the terminal surface of keeping away from radius prosthesis on the bulge ball, the fixed column periphery side is fixed with a plurality of barb shape protrudingly, protruding towards aforementioned radius prosthesis, be fixed with first screw and second screw on the bulge ball terminal surface of fixed column both sides respectively, radius prosthesis contains the half spherical groove that uses in aforementioned bulge ball cooperation, still be fixed with the joint handle that inserts in the radius pulp cavity on the half spherical groove, still be provided with a plurality of locating holes on the joint handle. The joint handle is mutually fixed with the radius through the screw, the stability of the radius prosthesis is strong, and when the fixing column is fixed with the metacarpal through bone cement, the binding force between the connection prosthesis and the metacarpal is increased through the bulge, so that the connection prosthesis and the radius prosthesis can be effectively prevented from falling off.

Description

Wrist joint prosthesis capable of effectively avoiding falling

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a wrist joint false body that can effectively avoid droing.

Background

The artificial total wrist joint prosthesis is mainly applied to patients suffering from various wounds, autoimmune diseases and wrist joint pain deformity and function loss caused by degeneration, and particularly patients suffering from joint diseases involving multiple joints can recover most functions of the wrist joints, reduce disability rate and improve life quality of the patients. The wrist joint is the most flexible and complex joint in the human body, and has the greatest function in daily life. Immune diseases such as rheumatic arthritis and the like are usually accumulated in wrist joints, and serious injury can be caused by trauma and degenerative changes caused by excessive application in work and life. The current universal total wrist joint fusion technology can cause patients to lose almost all functions of the wrist joints, and especially has higher function loss rate for patients with a plurality of joints accumulated by lesions. The function of most wrist joints can be kept by the total wrist replacement, and the problems of pain and deformity of patients are thoroughly solved.

The existing full wrist joint prosthesis has high prosthesis loosening rate after full wrist replacement. Since the first generation of artificial total wrist applications for more than half a century to date, artificial joint stability and durability have been the most prominent factors limiting their development. Thus, prostheses still do not provide good stability at present.

The utility model discloses it is not enough to solve prior art and research and propose.

Disclosure of Invention

The purpose of the present invention is to overcome the disadvantages of the prior art and to provide a wrist prosthesis which can effectively avoid falling off.

The utility model discloses can realize through following technical scheme:

the utility model discloses a can effectively avoid wrist joint prosthesis that drops, including connecting prosthesis and radius prosthesis, it includes the bulge ball to connect the prosthesis, be fixed with the fixed column fixed with the cooperation of metacarpal bone on keeping away from radius prosthesis's the terminal surface on the bulge ball, fixed column periphery side is fixed with a plurality of barb shape protrudingly, protruding towards aforementioned radius prosthesis, be fixed with first screw and second screw on the bulge ball terminal surface of fixed column both sides respectively, radius prosthesis contains the half spherical groove that uses in aforementioned bulge ball cooperation, still be fixed with the joint handle that inserts in the radius pulp cavity on the half spherical groove, still be provided with a plurality of locating holes on the joint handle. When the wrist joint prosthesis is replaced through an operation, the wrist joint prosthesis is fixed with the metacarpal bone through the fixing column, the second screw is fixed with the lunate bone on the metacarpal bone, the first screw is fixed with the scaphoid bone on the metacarpal bone, the joint handle on the radius prosthesis is inserted into the medullary cavity of the radius of a patient after the connection prosthesis is fixed, the joint handle is completely fixed on the radius after passing through the screw through the side wall of the radius and the positioning hole on the joint handle after being fixed, the joint handle is mutually fixed with the radius through the screw, the stability of the radius prosthesis is strong, the barb-shaped bulge is arranged on the fixing column, and when the fixing column is fixed with the metacarpal bone through bone cement, the binding force between the connection prosthesis and the metacarpal bone is increased through the bulge, so that the connection prosthesis and the radius prosthesis can be effectively prevented from being separated from each other, and the connection prosthesis and the radius prosthesis can be effectively prevented from falling off.

Preferably, the positioning hole is internally provided with an internal thread.

Compared with the prior art, the utility model has the advantages that:

the joint handle is mutually fixed with the radius through the screw, and radius false body stability is strong to set up barb shape arch on the fixed column, when the fixed column passes through bone cement and metacarpal bone is fixed, increase the cohesion between connection false body and the metacarpal bone through the arch, thereby can effectively avoid connecting false body and radius false body alternate segregation, can effectively avoid connecting false body and radius false body to drop.

[ description of the drawings ]

The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic view of the present invention assembled with a human body;

in the figure: 1. connecting the prosthesis; 2. a convex ball; 3. a first screw; 4. a second screw; 5. fixing a column; 6. a protrusion; 7. a radius prosthesis; 8. a hemispherical recess; 9. a section handle; 10. positioning holes; 11. the radius;

[ detailed description ] embodiments

The following detailed description of embodiments of the present invention is made with reference to the accompanying drawings:

as shown in fig. 1 and 3, the utility model discloses a wrist joint prosthesis that can effectively avoid droing, including connecting prosthesis 1 and radius prosthesis 7, connecting prosthesis 1 includes convex ball 2, be fixed with on the terminal surface of keeping away from radius prosthesis 7 on the convex ball 2 with the fixed column 5 fixed with the metacarpal bone cooperation, fixed column 5 periphery side is fixed with a plurality of barb shape protrudingly 6, protruding 6 is towards radius prosthesis 7, be fixed with first screw 3 and second screw 4 on the convex ball 2 terminal surface of fixed column 5 both sides respectively, radius prosthesis 7 contains the hemisphere recess 8 that uses in the convex ball 2 cooperation, still be fixed with the pitch handle 9 that inserts in the radius 11 medullary canal on the hemisphere recess 8, still be provided with a plurality of locating holes 10 on the pitch handle 9. When the wrist joint prosthesis is replaced by operation, the wrist joint prosthesis is fixed with the metacarpal bone through the fixing column 5, the second screw 4 is fixed with the lunar bone on the metacarpal bone, the first screw 3 is fixed with the scaphoid bone on the metacarpal bone, after the connection prosthesis 1 is fixed, the node handle 9 on the radius prosthesis 7 is inserted into the medullary cavity of the radius 11 of a patient, after the node handle 9 is fixed, the joint handle 9 is completely fixed on the radius 11 after the screw passes through the side wall of the radius 11 and the positioning hole 10 on the joint handle 9, the joint handle 9 is mutually fixed with the radius 11 through the screw, the stability of the radius prosthesis 7 is strong, and the barb-shaped bulge 6 is arranged on the fixing column 5, when the fixing column 5 is fixed with the metacarpal bone through bone cement, the binding force between the connection prosthesis 1 and the metacarpal bone is increased through the bulge 6, therefore, the mutual separation of the connection prosthesis 1 and the radius prosthesis 7 can be effectively avoided, and the falling off of the connection prosthesis 1 and the radius prosthesis 7 can be effectively avoided.

Wherein, the inside of the positioning hole 10 is also provided with an internal thread.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many changes, modifications, substitutions and variations can be made to the embodiments without departing from the technical principles of the present invention, and these changes, modifications, substitutions and variations should also be considered as the protection scope of the present invention.

Claims

1. A wrist joint prosthesis capable of effectively avoiding falling-off comprises a connecting prosthesis and a radius prosthesis, and is characterized in that: the connecting prosthesis comprises a convex ball, a fixing column fixed with a metacarpal bone in a matched and fixed mode is fixed on the end face, far away from the radius prosthesis, of the convex ball, a plurality of barb-shaped protrusions are fixed on the outer peripheral side of the fixing column, the protrusions face the radius prosthesis, a first screw and a second screw are fixed on the end faces of the convex balls on two sides of the fixing column respectively, the radius prosthesis comprises a hemispherical groove used in the matched mode of the convex ball, a joint handle inserted into a medullary cavity of the radius is further fixed on the hemispherical groove, and a plurality of positioning holes are further formed in the joint handle.

2. The wrist joint prosthesis capable of effectively avoiding the exfoliation according to claim 1, wherein: and internal threads are also arranged in the positioning holes.