Method for designing femoral stem prosthesis

Abstract

The invention relates to the technical field of medical instruments, in particular to a method for designing a femoral stem prosthesis, and solves the problem that the existing femoral stem prosthesisis made of a material with high elastic modulus, so that the difference between the high elasticity and that of human femur is large, resulting in different degrees of stress shielding, the problem that the manufacturing process can hardly satisfy the manufacture requirement on customization and complex interior structure, so that high matching prostheses meeting the individual needs cannot be implemented, and other problems. The method comprises establishing an STL model, carrying out simulation operation to establish a model, establishing a finite element mesh model, establishing model material properties, establishing boundary conditions, setting topological optimization parameters and extracting an STL format file from the optimized model; and carrying out post-processing of fairing and the like to remove chessboard patterns in the software Inspire to obtain an optimized femoral stem model; manufacturing an optimized prosthesis with ti6al4v, and finishing the manufacture by meansof an electron beam melting technique through an Arcam Q10 plus metal printer. The method for designing the prosthetic stem structure adopts integral forming and has no need for cutting, splicing andother processing, and the structure is good in biocompatibility.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a design method of a femoral stem prosthesis. Background technique [0002] Artificial hip replacement surgery has become a mature method for the treatment of degenerative arthritis, femoral head necrosis and other end-stage diseases of the hip joint. body. The existing hip femoral stem prosthesis mainly includes: Ribbed anatomical stem, CFP retained femoral neck short stem, S-ROM modular stem, CORAIL stem, Synergy Porous stem, etc. At present, femoral stem prosthesis materials are mostly metals and alloys such as titanium and titanium alloys, cobalt-based alloys, and tantalum. Especially titanium alloy, which has the characteristics of low density, high specific strength, good mechanical properties, corrosion resistance and good biocompatibility, has been widely used in the medical field, and it has also gained certain popularity in artificial implants. The design of ...

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problem that the existing femoral stem prosthesis uses a material with a high elastic modulus, which leads to a large gap between the elastic modulus and the human femur, resulting in different degrees of stress shielding. At the same time, the manufacturing process is difficult to achieve customization and the manufacturing requirements of complex internal structures , can not achieve high matching prosthesis for individual needs, etc., provide a new design method for femoral stem prosthesis

Images