Non-metal Ball-headed Hip Joint Prosthesis

Abstract

This invention revolves around medical devices, especially the non-metal ball-headed hip joint prosthesis, including acetabular cup, non-metal femoral head and femoral stem prostheses. In this invention, the acetabular cup is combined with the lining as a metal cup, and the traditional metal or ceramic ball head is replaced by non-metal femoral head prosthesis with metal inner core.

Claims

1. The non-metal ball-headed hip joint prosthesis includes acetabular cup, non-metal femoral head and femoral stem prostheses. The acetabular cup prosthesis has an inner spherical surface, which matches the external spherical surface of non-metal femoral head prosthesis. The non-metal femoral head prosthesis which moves within the acetabular cup prosthesis is equipped with a tapered inner core. A tapered locked connection will take shape when the femoral stem prosthesis is inserted into the tapered inner core of the non-metal femoral head prosthesis.

2. As described by claim 1, in the non-metal ball-headed hip joint prosthesis, the femoral stem prosthesis has a rough surface.

3. As described by claim 1, in any non-metal ball-headed hip joint prosthesis, the rough surface at the outside of the femoral stem prosthesis undergoes the cutting process at its right angle.

4. As described by claim 1, in any non-metal ball-headed hip joint prosthesis, the non-metal femoral head prosthesis is made of highly crosslinked polyethylene.

5. As described by claim 1, in any non-metal ball-headed hip joint prosthesis, the non-metal femoral head prosthesis is made of polyether ether ketone (PEEK).

6. As described by claim 1, in any non-metal ball-headed hip joint prosthesis, the tapered inner core is made of metal.

7. As described by claim 1, in any non-metal ball-headed hip joint prosthesis, the tapered inner core is made of ceramic.

Description

DESCRIPTION ON FIGURES

[0016] FIG. 1. Structural Diagram for the Traditional Total Hip Joint Prosthesis

[0017] FIG. 2. Schematic Diagram for the Motion Limit of One Side of Traditional Total Hip Joint Prosthesis

[0018] FIG. 3. Schematic Diagram for the Motion Limit of the Other Side of Traditional Total Hip Joint Prosthesis

[0019] FIG. 4. Front View of This Invention

[0020] FIG. 5. Schematic Diagram for the Motion Limit of This Invention

[0021] The figure presents metal acetabular cup 1, femoral head 2, lining 3, femoral stem 4, acetabular cup prosthesis 5, non-metal femoral head prosthesis 6, femoral stem prosthesis 7, rough surface 8 and tapered inner core 9.

SPECIFIC IMPLEMENTATION MODE

[0022] To help the technicians in this technical field better understand the technical scheme, further explanations on the invention are made according to the following figures and best implementation examples.

[0023] As revealed by the figures, this invention consists of acetabular cup prosthesis 5, non-metal femoral head prosthesis 6 and femoral stem prosthesis 7. The acetabular cup prosthesis has an inner spherical surface and the non-metal femoral head prosthesis which moves within the acetabular cup prosthesis is equipped with a tapered inner core. A tapered locked connection will take shape when the femoral stem prosthesis is inserted into the tapered inner core of the non-metal femoral head prosthesis.

[0024] The tapered inner core is preferably made of metal or ceramic.

[0025] FIG. 5 shows the motion limit of two sides of the non-metal ball-headed hip joint prosthesis. Due to the combination of lining with femoral head, it is unnecessary to make one side of lining protrude from metal acetabular cup so that the limitations on the motion range of joint prosthesis will be removed.

[0026] In this invention, the combination of original lining with femoral head has reduced the connections between different parts to remarkably reduce the probability of abrasion and make up for the deficiency that traditional total joint prosthesis has a small motion range.

[0027] The non-metal femoral head prosthesis is made of highly abrasion-resistant non-metal materials, and the preferable choice is highly crosslinked polyethylene or polyether ether ketone (PEEK).

[0028] A rough surface may be designed for femoral stem prosthesis in order to ensure the stability after the implantation of joint prosthesis.

[0029] To address the problem that the untimely ingrowth of femoral stem prosthesis at the inner side after the implantation, the rough surface at the outside of femoral stem prosthesis may undergo the cutting process at the right angle so that force transmission will begin from the inner side to effectively promote the ingrowth of bone.

[0030] The above is the description on the preferable implementation mode of this invention. It is worth noticing that ordinary technicians in this technical domain may also make improvements which should be also deemed to fall under the scope of this invention on the premise of following the principle of this invention.