Method for obtaining a biocompatible coating on a medical implant

Abstract

The utility model relates to the field of medical technology, namely to the technology of producing biocompatible calcium phosphate coatings on metal implants that have osseointegration properties, and can be used in traumatology, orthopedics and dentistry in the manufacture of coatings for stainless steel implants for compatibility with bone tissue and for improving their biological adaptation to a living organism. The objective of the proposed utility model is to develop a method for producing a biocompatible coating on a stainless steel metal implant, ensuring the formation of a dense, uniform coating structure while preserving the hydroxyapatite phase, suitable for use in various types of medical implants. The technical result achieved by the utility model consists of increasing the adhesive strength and density (reducing porosity) of the biocompatible coating while maintaining the crystalline hydroxyapatite phase. A method for producing a biocompatible coating for a medical implant is proposed, which includes preparing the surface of a metal implant and then forming the coating by spraying hydroxyapatite powder, characterized in that the coating is formed by supersonic (high-speed) gas-flame spraying (HVOF) using a composite powder of hydroxyapatite (HAp) and titanium dioxide (TiO₂), The coating is applied to a 316L stainless steel substrate at a spraying distance of 250 mm, with a powder feed rate of 8–12 l / min, an oxygen / kerosene flow ratio of 25 / 45 to 26 / 46 l / min, and a TiO₂ / HAp powder component ratio of 50 / 50 to 30 / 70.