Variable-density porous metal orthopedic implant preparation method based on topology optimization technology

Abstract

The invention discloses a variable-density porous metal orthopedic implant preparation method based on a topology optimization technology. The method comprises the steps that a bone geometric model isestablished through CT scanning, a microstructure is selected, and the porosity, the pore size of the microstructure and wall thickness conditions of the microstructure serve as constraint conditionsof topology optimization; attributes of an equivalent entity unit are calculated through a homogenization method, and a finite element is used for calculating the chemical performance of an implantedthrough the equivalent entity unit; the density distribution in the implant area is obtained through the density method topology optimization technology, and the porosity, the pore size of the microstructure and the wall thickness conditions of the microstructure serve as constraint conditions of topology optimization; a geometric model of the variable-density gradient porous orthopedic implant is constructed on the basis of the position information of a finite element node unit; the variable-density porous metal orthopedic implant is manufactured through 3D printing processing. The bone absorption is low, the mechanical property is good, the service life is long, and the probability of correction operations after the implant is implanted for a period of time can be reduced.

Description

Technical field [0001] The invention relates to a high-performance and low-modulus metal orthopedic implant, in particular to a method for preparing a variable-density porous metal orthopedic implant based on a multi-scale and multi-constraint topology optimization technology. Background technique [0002] Artificial orthopedic implants are one of the main methods of treatment of the musculoskeletal system. They are used for the treatment of millions of patients with orthopedic diseases every year, and the global market scale is as high as tens of billions of dollars. However, traditional metal (such as titanium alloy, cobalt alloy, etc.) orthopedic implants will bear most of the load after implantation due to the excessive elastic modulus, resulting in a stress shielding effect, resulting in bone resorption due to the lack of exercise for the postoperative bones , It will lead to osteoporosis and cause the implant to loosen, requiring corrective surgery. Therefore, it is necess...

AI Technical Summary

Problems solved by technology

However, the geometry of variable-density porous orthopedic implants is extremely complex. How to connect microstructures of different densities, how to distribute microstructures of different densities, and how to construct a variable-density porous geometric model according to the density distribution are all difficult problems to be solved.

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