A bionic hip joint

Abstract

The invention relates to a bionic hip joint. The bionic hip joint comprises a femoral stem (1), a femoral neck (2) and connecting nails (3), wherein by virtue of the connecting nails (3), the femoral stem (1) and the femoral neck (2) are connected into a whole body; adhesion layers (8), which are made from a multi-stage porous material, are arranged on the outer surface of the middle of the femoral stem (1); the adhesion layers (8) are represented as strip-shaped structures which are distributed in the middle of the femoral stem (1) in a continuously spiral surrounding mode; the side, close to the femoral neck (2), of the upper end of the middle of the femoral stem (1) is provided with a conical bump (9); and the tail end of the lower part of the femoral stem (1) is represented in a fork-shaped form (10). The bionic hip joint provided by the invention is relatively high in overall connecting stability and biocompatibility, and structural design is more optimized, so as to facilitate implanting.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a bionic hip joint. Background technique [0002] At present, the existing hip joint implants have a variety of structural designs, and individual designs are particularly complex, with many components, and the replacement operation takes a long time and has low efficiency. In addition, the stability of the connection with human tissue is not high, it is easy to loosen and fall off after implantation, the biocompatibility is poor, human tissue is prone to rejection, and the service life is short, which is also to be solved as an external implant prosthesis It is difficult to achieve all of these problems by simply relying on optimal structural design. [0003] Porous materials have the characteristics of low relative density, high specific strength, high specific surface area, light weight, and good permeability, and are widely used in many fields such as chemical industry and med...

AI Technical Summary

Problems solved by technology

However, most of the porous structures used in the current artificial joint 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

[0004] 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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