Prosthesis based on connection structure of porous surface structure and substrate

Abstract

The present invention discloses a prosthesis based on a connection structure of a porous surface structure and a substrate. The connection structure comprising: a composite body comprising the poroussurface structure and an intermediate connected in advance; the substrate which is used for forming a prosthesis main body, wherein the surface of the prosthesis main body is taken a connecting area and is connected with the composite body; and the intermediate which is located between the porous surface structure and the substrate, and is connected with the connecting area of the prosthesis mainbody, so that the porous surface structure is located in the connectingarea of the prosthesis main body; wherein the substrate and the composite body are arranged between a first polar electrode and asecond polar electrode, and are in electric contact with the porous surface structure and / or the intermediate through the first polar electrode, and the substrate is in electric contact with the second polar electrode, so that a current loop is formed, and resistance welding of the intermediate and the substrate is realized. The composite body and the substrate are connected through a resistancewelding method, and the mechanical property of the substrate is kept; it is ensured that the artificial implant prosthesis has excellent bone ingrowth performance, and the strength of the substrate isnot substantially affected.

Description

technical field [0001] The invention relates to a connection technology of mechanical structures, in particular to a medical device, and provides a prosthesis based on a connection structure of a porous surface 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 In addition, there are specific performance requirements for the surface of the prosthesis, so as to meet the firm combination of the surface of the prosthesis and the patient's bone group and ensure that the prosthesis does not loosen; otherwise, the patient will have pain, and the prosthesis...

AI Technical Summary

Problems solved by technology

However, for high-porosity structures, when resistance welding is used to directly connect the porous structure and the substrate, the bonding efficiency is low at this time, resulting in insufficient welding bonding strength or requiring too high a current to achieve sufficient welding strength, The latter causes the contact between the upper electrode and the upper surface of the porous structure to generate too much heat so that the surface of the porous structure is damaged too much, including the sinking of the pore structure. Therefore, the present invention needs to design an intermediate structure between the porous structure and the substrate. Realize that the complex formed by the porous surface structure and the middle bottom plate is closely combined with the substrate to improve the bonding efficiency of the porous structure and the substrate and ensure sufficient welding strength

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