a shoulder prosthesis

Abstract

The invention relates to a shoulder joint prosthesis. The shoulder joint prosthesis comprises a humeral head (1) and a humeral stem (2). The shoulder joint prosthesis is characterized in that the humeral head (1) is of a hemispherical structure, and an inserting rod (3) is fixed to the end face of the humeral head; a through hole (4) is formed in the inserting hole (3); an inserting hole (5), which goes through in an oblique direction, is formed in the head part of the humeral stem (2); the inserting rod (3) is inserted into the inserting hole (5), and the part, where the through hole (4) is formed, of the inserting rod (3) extends out of the inserting hole (5); a nail (6) is matched in the through hole (4); a stem body of the humeral stem (2) is made from a multi-stage porous material; and arc-shaped grooves (7) are formed in the stem body. The shoulder joint prosthesis provided by the invention is simple and convenient in structural design, relatively high in overall connectivity and biocompatibility and is conducive to rapid recovery after operations.

Description

technical field [0001] The invention relates to human shoulder joint replacement technology, in particular to a shoulder joint prosthesis. Background technique [0002] At present, there are various structural designs of shoulder joint prostheses used clinically. In order to increase the connection stability of the structure itself, individual designs are particularly complex and have many components, which is not conducive to efficient replacement surgery. At the same time, they also have defects such as low connection stability with human tissues and poor biocompatibility. After implantation, it is easy to cause poor fixation effect after replacement, loosening and falling off, and shorten their service life. question. However, in order to solve these common problems, it is difficult to realize them all simply by optimizing the structural design. [0003] Porous materials have the characteristics of low relative density, high specific strength, high specific surface area...

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 existing reports on the selection of multi-level porous materials are very limited.

This may be mainly due to the fact that the porous material itself also has a significant decrease in structural mechanical strength as the porosity increases, so the porosity is generally low and the permeability is low, which is not conducive to the efficient exchange of substances in human tissues and biocompatibility. Poor performance, heavy weight, poor body feeling after operation, and uneven distribution of voids lead to uneven distribution of mechanical strength, elastic modulus, etc., resulting in defects such as hidden quality

For example, CN201210185031 discloses a method for preparing a bionic artificial bone with a multi-level (micron / nano) pore structure. However, the three-dimensional multi-level pore structure obtained by this method still cannot be obtained due to the randomness and irregularity of the pore structure. Meet the 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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