Method of connecting porous structure and substrate

Abstract

The invention provides a method for connecting a porous structure and a substrate. The porous structure and an intermediate are connected in advance to form a complex; the substrate is of a solid or high-density porous structure; the intermediate is a solid or high-density porous structure, and the density of the intermediate is between the density of the porous surface structure and the density of the substrate; the complex is configured at the substrate, and selectively arranging of positioning structures such as a reverse inclined plane and / or a buckle as required is carried out; and welding at a proper position between the intermediate and the substrate is carried out, and the complex is connected to the substrate, so that the surface of the substrate is coated with the porous structure. Effective combination of the porous structure and the substrate is achieved, the connection requirement that the overall mechanical structure and the surface performance are different is met, meanwhile, the problem that the mechanical performance of the substrate is greatly reduced due to the hot pressing process and the like is solved, and the method is suitable for preparation of various artificial implant prostheses.

Description

technical field [0001] The invention relates to a connection technology of a mechanical structure, in particular to a medical device, and provides a connection method of a porous structure and a substrate. Background technique [0002] Engineering applications often have different requirements on the overall performance and surface performance of mechanical structures. For example, the overall performance (such as fatigue strength) of the acetabular cup and femoral stem of the artificial hip joint must meet the dynamic load that the prosthesis bears when it is implanted in the body for decades, with an average of one million to two million walks per year The lower anti-fatigue requirements, and specific performance requirements for the surface of the prosthesis, to meet the firm combination of the surface of the prosthesis and the patient's bone tissue to ensure that the prosthesis does not loosen. Otherwise, the patient will have pain, and the prosthesis must be removed, a...

AI Technical Summary

Problems solved by technology

However, when the porosity of the porous structure is high (>50%), the proportion of interconnected scaffolds is low and weak; a large number of pores are formed between the scaffolds

Whether such a high-porosity structure is realized by metal 3D printing additive manufacturing process or by sintering, when the porous structure and the substrate are directly connected by laser welding, as long as the effective diameter of the laser beam is close to or even larger than the width of the stent , the laser energy may directly break the support structure, break through the porous structure, and cannot achieve welding connection between the porous structure support and the base support

Or, when penetration welding is used to connect the porous structure and the substrate, the strength of the substrate structure will be greatly reduced due to the high temperature and high pressure process conditions

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