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Processing of hydroxylapatite coatings on titanium alloy bone prostheses

United States Patent

5,817,326
October 6, 1998
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Processing of hydroxylapatite sol-gel films on titanium alloy bone prostheses. A method utilizing non-line-of-sight ion beam implantation and/or rapid thermal processing to provide improved bonding of layers of hydroxylapatite to titanium alloy substrates while encouraging bone ingrowth into the hydroxylapatite layers located away from the substrate, is described for the fabrication of prostheses. The first layer of hydroxylapatite is mixed into the substrate by the ions or rapidly thermally annealed, while subsequent layers are heat treated or densified using ion implantation to form layers of decreasing density and larger crystallization, with the outermost layers being suitable for bone ingrowth.
Nastasi; Michael A. (Espanola, NM), Levine; Timothy E. (Santa Clara, CA), Mayer; James W. (Phoenix, AZ), Pizziconi; Vincent B. (Phoenix, AZ)
The Regents of the University of California (Los Alamos, NM)
08/ 566,339
December 1, 1995
FIELD OF THE INVENTION The present invention relates generally to hydroxylapatite-coated titanium alloy bone implants and, more particularly, to improving the adhesion of hydroxylapatite coatings to titanium alloy substrates for use in bone implantation. The invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy to the Regents of The University of California. The government has certain rights in the invention.