A compound hip joint

Abstract

The invention relates to a composite hip joint. The composite hip joint comprises a femoral stem (1) and a femoral neck (2). The hip joint is characterized in that the lower part of the femoral neck (2) is provided with a barb (3), a head of the femoral stem (1) is internally provided with an L-shaped hole (4), the lower part of the femoral neck (2) is plugged in the L-shaped hole (4), and the barb (3) is hooked and clamped in a horizontal hole in the L-shaped hole (4). The middle part and the lower part of the stem body of the femoral stem (1) are respectively provided with a padding interlayer (9) passing through two sides of the stem body, and holes (10) which pass through the stem body and communicated with the padding interlayer (9). The padding interlayer (9) is made of a multistage porous material. The composite hip joint has relatively high connection stability and biocompatibility, and is more stable after being implanted, and has better postoperative healing effect.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a composite hip joint. Background technique [0002] At present, most of the existing artificial hip replacement prostheses are dense metal parts. In application, due to its own defects in material selection, it lacks material exchange with human tissue, and its biocompatibility with human tissue is poor. It is prone to rejection after implantation, and the postoperative healing effect is not good. In addition, as external implants, there are common problems such as how to enhance the stability of the connection with human tissue to prevent loosening, rotation and falling off. [0003] Porous materials have the characteristics of low relative density, high specific strength, high specific surface area, and good permeability, and are widely used in many fields such as chemical industry and medicine. Among them, the multi-level porous material has attracted much attention due to it...

AI Technical Summary

Problems solved by technology

[0004] However, the hierarchical porous materials currently used in artificial joint replacement prostheses 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. Their porosity is generally low, their weight is heavy, and their permeability is low, which is not conducive to the efficient exchange of substances in human tissues. The biocompatibility is not ideal, and the healing effect after surgery is not good; the human tissue cannot fill the inside of the structure, and the cell stress barrier cannot be eliminated, etc.

In addition, the application of bionic artificial bone requires that the material itself is uniform, such as pore size and pore distribution, so as to make the performance 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 under the large-volume scale. If it is measured and compared with the small-volume scale, for example, a plurality of three-dimensional bodies whose volume is not larger than one cubic centimeter are randomly selected on the material, and their masses are measured separately. The difference in uniformity 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, resulting in uneven distribution of mechanical strength, elastic modulus, etc., resulting in defects such as hidden quality, which seriously affect 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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