a hip prosthesis

Abstract

The invention relates to a hip prosthesis. The hip prosthesis comprises a femoral stem (1) and a femoral neck (2). The hip prosthesis is characterized by further comprising connecting nails (3) and a fastening inserting rod (4), wherein an L-shaped cross section (5) is arranged on the head part of the femoral stem (1), and threaded holes (6) are formed in the longitudinal surface of the L-shaped cross section (5); through holes (7) are formed in the lower side of the femoral neck (2); the connecting nails (3) run through the through holes (7) and are in matched connection to the threaded holes (6); a hole (9) is formed in a stem body of the femoral stem (1); the fastening inserting rod (4) is matched in the hole (9); and a stem body lower part (10) of the femoral stem (1) is made from a multi-stage porous material. The hip prosthesis provided by the invention is simple and convenient in design and is relatively high in overall connectivity, connecting stability and biocompatibility; and the hip prosthesis can facilitate the efficient implementation of an implanting operation.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a hip joint prosthesis. Background technique [0002] At present, there are various structural designs of hip joint prostheses used clinically for the treatment of human hip joint lesions. 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 common problems such as low stability of connection with human tissue, easy loosening and falling off after implantation, poor biocompatibility, certain rejection of human tissue, and short service life. It is difficult to realize all 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 wi...

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 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 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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