Threaded biomedical implant structure and selective surface treatment method thereof

Abstract

The invention discloses a threaded biomedical implant structure and a selective surface treatment method thereof. The surface of the biomedical implant structure has threads and a plurality of nano holes, wherein the holes are only distributed in an area between threads. The method comprises: providing a biomedical implant structure with threads on the surface; cleaning the surface of the biomedical implant structure; performing heat treatment and anodic treatment on the biomedical implant structure; and forming the plurality of nano holes on the surface of the biomedical implant structure. The nano holes are selectively grown between the threads, and electrolyte used in the anodic treatment contains fluorinions. In the biomedical implant structure and the selective surface treatment method thereof, the nano holes are selectively grown only in the area between the threads on the surface of the implant structure, so when the implant structure is stressed, the parts where the threads with relative low strength are formed are insusceptible to deformation or collapse due to stress; and after being implanted into a human body, the implant structure does not loose off.

Description

Technical field [0001] The invention relates to a biomedical implant structure, in particular to a biomedical implant structure with bioactive substances and nano-level holes on the surface, and a method for surface treatment of the biomedical implant structure. Background technique [0002] Generally speaking, after implantation into the human body, the implant must avoid causing lesions around the tissue, that is, the implant cannot release or dissociate toxic substances, nor cause blood coagulation or hemolysis. Biocompatibility is the first priority in material selection. [0003] At present, the metal materials commonly used in biomedical implants are stainless steel, titanium alloy, chromium-cobalt alloy, etc. Among them, titanium is the most commonly used. In addition to the original mechanical properties of the metal, when the titanium is exposed to air or water Or in vivo, it will spontaneously generate a highly stable oxide layer and has excellent biocompatibility. Accor...

AI Technical Summary

Problems solved by technology

Although multiple nanoholes can be formed by using this method, the surface holes are characterized in that the walls of the holes are separated and not connected, and the overall mechanical strength of the implant may be too weak. When the force is applied, the implant may deform or collapse due to the independent hole structure

And it does not disclose how to coat the active material in the hole

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