Method for coating implants and surgical devices made of titanium and titanium alloys
AssigneeQueen's University at Kingston
InventorMorteza Shirkhanzadeh
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Abstract
A method for coating implantable medical devices, such as orthopaedic prostheses, with a dense, substantially non-porous oxide coating so as to minimize ion release therefrom, and the product of that process is described. The prosthesis is subjected to anodic electrolytic deposition in an alcoholic electrolyte containing alkali metal nitrate or nitric acid. In a preferred embodiment the anodically coated prosthesis is also coated with a bioactive layer of calcium phosphate.
Claims18
A process for producing a protective, dense, non-porous and biocompatible oxide coating on a metal substrate selected from the group consisting of titanium, zirconium and alloys thereof, comprising anodically depositing said oxide coating by immersing a selected said substrate in an electrolyte comprising at least one of an alkali metal nitrate and nitric acid dissovled in an alcohol having the formula ROH where R is selected from an alkyl group having 1 to 4 carbon atoms, an aryl group and mixtures thereof, and passing a current through said electrolyte for a sufficient time to anodically deposit said coating on said substrate.
Dependencies are inferred from the claim text.