Combined acetabular prosthesis

Abstract

The invention relates to a combined acetabular prosthesis. The combined acetabular prosthesis comprises an acetabular cup and a liner (1), and is characterized in that the acetabular cup is composed of a cup bottom (3) and a cup body (4) fixedly connected to the upper end of the cup bottom (3), wherein the cup body (4) is made of a hierarchical porous material, a clamping groove (5) is arranged at the inner surface of the rim at the upper part of the cup body (4), a spring clamping ring (2) is increased in the clamping groove (5), the liner (1) is placed in the acetabular cup, the rim of the liner (1) pushes against the lower surface of the spring clamping ring (2), and holes (8) are formed in the cup bottom (3). The structure of the combined acetabular prosthesis can play the connecting and stabilizing roles, is convenient to mount, and has relatively high biocompatibility.

Description

technical field [0001] The invention relates to a medical device, in particular to a combined acetabular prosthesis. Background technique [0002] Artificial hip replacement is currently the most effective medical method for reconstructing the function of the damaged hip joint clinically. Traditional acetabular prosthesis includes components such as acetabular cup and inner liner, but the installation method between the acetabular cup and the inner liner is often directly inserted without fixing the position, so it will loosen or shift during use , and its connection stability is poor. In addition, most of its materials are dense metals, lack of material exchange between human tissues around the prosthesis after implantation, poor biocompatibility, easy to be rejected, and poor healing effect; and as an external implant, there are still some problems. Enhance the stability of the connection with human tissue to avoid loosening, rotation and falling off. [0003] Porous ma...

AI Technical Summary

Problems solved by technology

However, the hierarchical porous materials currently used in artificial joint replacement are very limited

This may be mainly due to the fact that the existing porous materials themselves cannot have both high porosity and structural mechanical strength. Therefore, their porosity is generally low, their own weight is heavy, and their penetration is poor, which is not conducive to the high efficiency of substances in human tissues. Exchange, biocompatibility is not ideal, postoperative healing effect is not good; human tissue cannot fill the inside of the structure, and the cell stress barrier cannot be eliminated; in order to increase the stability of the connection with human tissue, it is necessary to add connecting parts to the prosthesis, etc.

[0004] In addition, the application of bionic artificial bone requires uniform material itself, such as pore size and pore distribution, so that the performance is uniform, but in fact, there are many multi-level porous materials that cannot meet this requirement; although some claim to have reached high Uniformity, but its uniformity is still the uniformity at the large volume scale. If you use a small volume scale to measure and compare, for example, take multiple three-dimensional bodies of the same size and the volume is not larger than one cubic centimeter on the material, and measure their masses respectively. , the difference in the degree of inhomogeneity is still very large, so the various properties of the hierarchical porous material are not uniform, such as the uneven distribution of pore size and voids, which leads to the uneven distribution of mechanical strength, elastic modulus, etc., resulting in defects such as hidden quality , which seriously affects its function

For example, CN201210185031 discloses a preparation method of a bionic artificial bone with a multi-level (micron / nanometer) pore structure, but the three-dimensional multi-level pore structure obtained by this method still cannot meet the requirements due to the randomness and irregularity of the pore structure. Functional requirements of bionic artificial bone

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