Lean electrolyte for biocompatible plasmaelectrolytic coatings on magnesium implant material

US9066999B2 · kind B2 · utility

Assignee

• DePuy Synthes Products, Inc. · US

Inventors

• Thomas Imwinkelried · Flurlingen, CH
• Peter Kurze · Pulsnitz, DE
• Stefan Beck · Reno, US
• Dora Banerjee · Kerpen, DE
• Tamara Schwarz · Bergheim, DE

Key dates

• Filing date: Nov 7, 2012
• Grant date: Jun 30, 2015
• Expiry date: Aug 16, 2033

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L2430/02
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present disclosure is directed, at least in part, to a method of producing ceramic layers on magnesium and its alloys, a magnesium implant with a ceramic layer made by the method, and a magnesium implant having a biocompatible ceramic layer substantially free of material which impairs the biocompatibility of said biocompatible ceramic layer. In an exemplary embodiment, the method of producing ceramic layers on magnesium and its alloys, includes (a) immersing an implant and a metal sheet into the aqueous electrolyte bath, said aqueous electrolyte bath including: ammoniac, diammonium hydrogen phosphate and urea, and wherein the implant is made of magnesium or its alloy; (b) performing a anodic oxidation by passing a current between the implant, the metal sheet and through the aqueous electrolyte bath, wherein the implant is connected to a positive pole of a current source and the metal sheet is connected to a negative pole of the current source; (c) applying a current density selected to form sparks on said implant, to thereby form a ceramic layer on said implant.