Simple hip joint

Abstract

The invention relates to a simple hip joint. The hip joint comprises a femoral stem (1) and a femoral neck (2). The hip joint is characterized in that the upper end face of the head of the femoral stem (1) is provided with an installing hole (4), and the tail end of the lower part of the femoral neck (2) is directly cooperated with the installing hole (4). The lower part of the femoral stem (1) is formed by a stem body (8) and an annular jacket layer (9) which is attached on the outer surface of the stem body (8). The annular jacket layer (9) is made of a hierarchical porous material. The tail end of the stem body on the lower part of the femoral stem (1) extends out of the annular jacket layer (9), and the tail end of the stem body is provided with a discontinuous annular workpiece (10) which is coaxial with the femoral stem (1). The hip joint is simple in structural design, and has relatively high biocompatibility, and connection is stable after implantation, and post-surgery healing effect is better and faster.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a simple hip joint. Background technique [0002] At present, the existing artificial hip joint prosthesis has a variety of structural designs. In order to increase the connection stability of the structure itself, individual designs are particularly complicated and have many components, which is not conducive to efficient replacement surgery. In order to facilitate the implantation operation, there is also a one-piece design in the prior art. Although its structure has the advantages of being easy to process and shape, if individual parts break during application, such as neck breaks, etc., it will lead to the failure of the overall structure. Function failure, which undoubtedly caused a huge waste. In addition, the existing artificial hip joint prosthesis generally has low stability of connection with human tissue after implantation, and it is easy to loosen, rotate and fall off...

AI Technical Summary

Problems solved by technology

However, most of the porous structures used in the current artificial joint replacement 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 method for preparing a bionic artificial bone with a multi-level (micron / nanometer) pore structure. The three-dimensional multi-level pore structure prepared by it still cannot meet the requirements of the bionic artificial bone due to the randomness and irregularity of its pore structure. feature request for

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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