A multi-segment hip joint

Abstract

The invention relates to a multi-section type hip joint. The multi-section type hip joint comprises a femoral stem (1) and a femoral neck (2), wherein the femoral stem (1) comprises a proximal end (3) and a distal end (4); a mounting hole (5) is formed in the upper end surface of the head of the proximal end (3); the lower part of the femoral neck (2) is directly matched in the mounting hole (5); a filling interlayer (6) penetrating through two sides of the stem body and being made of a hierarchical porous material is arranged in the middle of the proximal end (3); an inner hole (7) is formed at the lower part of the proximal end (3), and a step face (8) is arranged in the inner hole (7); a connecting rod (9) is arranged at the head of the distal end (4), and an elastic barb (10) is arranged at the end part of the connecting rod (9); the connecting rod (9) is inserted into the inner hole (7), the elastic barb (10) hooks and clamps the step face (8) in the inner hole (7); an interval area (11) is formed between the end surface of the head of the distal end (4) and the end surface of the lower part of the proximal end (3). The multi-section type hip joint is high in connecting stability and biocompatibility, and good in implantation effect.

Description

technical field [0001] The invention relates to human body joint replacement, in particular to a multi-segment hip joint. Background technique [0002] At present, most of the hip replacement prostheses are designed in one piece, which has the defect of lack of cushioning function. During the application, the load is relatively large, the stress condition is poor, and the service life is short. In addition, the existing replacement prosthesis generally has low stability of connection with human tissue, easy loosening, rotation and falling off; poor biocompatibility, easy to suffer rejection after implantation, poor postoperative healing effect, etc. common problem. 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 widely used in many fields such as chemical in...

AI Technical Summary

Problems solved by technology

However, most of the porous structures used in artificial joint replacement prostheses are single-pore materials, and the reports on 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 in porosity, so the porosity is generally low, the weight is heavy, and the permeability is low, which is not conducive to the removal of substances in human tissues. High-efficiency exchange, poor biocompatibility, and poor postoperative healing effect; in addition, the application of bionic artificial bone requires the material itself to be uniform, such as pore size and pore distribution, so that the performance is uniform, but in fact, some Many hierarchical porous materials do not 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. For comparison, for example, a plurality of three-dimensional bodies whose volume is not larger than one cubic centimeter are randomly selected on the material, and their masses are measured respectively, and the difference in the degree of inhomogeneity is still very large, thus resulting in inhomogeneity in various properties of the hierarchically porous material, such as pore size, The uneven distribution of voids leads to uneven distribution of mechanical strength, elastic modulus, etc., resulting in defects such as quality hazards, which seriously affect 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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