Buffer hip joint

Abstract

The invention relates to a buffer hip joint. The hip joint comprises a femoral stem (1) and a femoral neck (2). The hip joint is characterized in that the femoral stem (1) is divided in two parts of a near end (3) and a far end (4). The heat of the near end (3) is internally provided with an L-shaped hole (5). The lower part of the femoral neck (2) is plugged in the L-shaped hole (5). The lower part of the near end (3) is provided with an inner hole (6), and the inner hole (6) is internally provided with a step surface (7). The far end (4) is made of a hierarchical porous material. The head of the far end (4) is added with a connecting rod (8). The end of the connecting rod (8) is provided with an elastic barb (9). The connecting rod (8) is plugged in the inner hole (6), and the elastic barb (9) is hooked and clamped in the step surface (7) of the inner hole (6). The inner hole (6) is longer than the connecting rod (8). The hip joint is reasonable in structural design, and connection stability and biocompatibility are relatively high, and post-surgery healing effect is better and faster.

Description

Technical field [0001] The present invention relates to human joint replacement, in particular to a cushion type hip joint. Background technique [0002] At present, most of the existing artificial hip replacement prostheses are of one-piece design. Although they have the advantages of easy processing and forming, if individual parts are broken, such as a broken neck, it will lead to failure of the overall structure and function. It undoubtedly caused huge waste; at the same time, due to the lack of cushioning function in the integrated design itself, it has a poor ability to withstand alternating forces and a short service life in applications. In addition, the existing design of replacement prosthesis also has poor connection stability with human tissues, easy to loosen, rotate and fall off; poor biocompatibility, easy to suffer rejection after implantation, and poor postoperative healing effect, etc. Common problems. These problems cannot be fully realized by simply relying ...

AI Technical Summary

Problems solved by technology

[0004] However, most of the porous structures used in artificial joint replacement prostheses 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 weight, and poor postoperative human experience; in addition, in order to apply to bionic artificial bones, 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 hierarchical porous materials that cannot meet this requirement, and their uniformity is insufficient; although some materials claim to have achieved high uniformity, their uniformity is still the uniformity at the large volume scale. To measure and compare, for example, take a number of three-dimensional bodies whose 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, which leads to inhomogeneity in various properties of the multi-level porous material, such as the size of the pores. , Uneven distribution of voids leads to 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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