Hip joint replacement prosthesis

Abstract

The invention relates to a hip joint replacement prosthesis. The hip joint replacement prosthesis comprises a femoral stem (1) and a femoral neck (2). The hip joint replacement prosthesis is characterized in that the tail end of the lower part of the femoral neck (2) is formed by two parts, one part is an elastic barb (4) and the other part is a cylindrical object (5), and an interval gap (6) is arranged between the elastic barb (4) and the cylindrical object (5). The head of the femoral stem (1) is internally provided with an L-shaped hole (7). The lower part of the femoral neck (2) is plugged in the L-shaped hole (7), and the elastic barb (4) is hooked and clamped in a horizontal hole (9) of the L-shaped hole (7). The surface of the lower part of the femoral stem (1) is attached with raised edges (11) made of a hierarchical porous material. The hip joint replacement prosthesis is reasonable in structure design, and has relatively high connection stability and biocompatibility after being implanted.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a hip joint replacement prosthesis. Background technique [0002] At present, most of the existing hip replacement prostheses are designed in one piece. Although this structure has the advantages of easy processing and installation, but due to factors such as uneven force during application, if some parts of it break, such as the neck Breakage and other situations will cause the overall function of its structure to fail, which undoubtedly causes huge waste. In addition, the existing hip joint replacement prosthesis also has low stability of connection with human tissue in the early stage of implantation, and it is easy to loosen and fall off; the biocompatibility is poor, and it is easy to repel with human tissue in the later stage of implantation, and the service life Shorter and other common problems, these problems cannot be fully realized by simply relying on optimal structura...

AI Technical Summary

Problems solved by technology

However, most of the porous structures used in the current artificial joint replacement prosthesis are single-pore materials, and the reports on the selection of multi-level porous materials are very limited.

This may be mainly due to the fact that the existing porous materials themselves have a significant decrease in structural mechanical strength with the increase of porosity, so the porosity is generally low and the permeability is low, which is not conducive to the efficient exchange of substances in human tissues. Poor biocompatibility, heavy self-weight, poor postoperative human body feeling, and uneven distribution of voids lead to uneven distribution of mechanical strength, elastic modulus, etc., resulting in defects such as quality hazards

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

In addition, as a multi-level porous material applied to bionic artificial bone, the material itself needs to be uniform, that is, the size of the pores and the distribution of the pores are uniform, so that the performance is uniform, but in fact, there are many multi-level porous materials that cannot meet this requirement. Its uniformity is insufficient; although some materials claim to have achieved high uniformity, their uniformity is still the uniformity at the large volume scale. For a three-dimensional body larger than one cubic centimeter, the mass of the three-dimensional body is measured separately, and the difference in the degree of inhomogeneity is still very large, so the various properties of the porous material such as mechanical strength, elastic modulus, etc. are inhomogeneous, which seriously affects its function.

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