A combined hip joint

Abstract

The invention relates to a combined type hip joint. The hip joint comprises a femoral stem (1) and a femoral neck (2). The tail end of the lower part of the femoral neck (2) is formed by two parts, one part is an elastic barb (3) and the other part is a cylindrical object (4), and an interval gap (5) is arranged between the elastic barb (3) and the cylindrical object (4). The head of the femoral stem (1) is provided with an L-shaped hole (6). The lower part of the femoral neck (2) is plugged in the L-shaped hole (6), and the elastic barb (3) is hooked and clamped in a horizontal hole (8) of the L-shaped hole (6). The middle part of the femoral stem (1) is provided with a filling interlayer (10) which passes through two sides of a stem body and is made of a hierarchical porous material. The hip joint has relatively high connection stability and biocompatibility, and implanting mounting operation is convenient.

Description

technical field [0001] The invention relates to human joint replacement, in particular to a combined hip joint Background technique [0002] At present, most of the existing hip joint implants are designed in one piece. Although this structure has the advantages of easy processing and installation, but due to factors such as uneven force during application, if some parts of the structure break Situations such as a broken neck will result in failure of the overall function of the structure, which undoubtedly causes huge waste. In addition, the existing hip joint implants still have low stability of connection with human tissue, easy loosening and falling off after implantation, poor biocompatibility, easy rejection by human tissue, and short service life. Common problems, these problems cannot be fully realized by simply relying on optimal structural design. [0003] Porous materials have the characteristics of low relative density, high specific strength, high specific sur...

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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