Prosthesis bearing component

US6638311B2 · kind B2 · utility

Assignee

• Benoist Girard SAS · FR

Inventors

• Aiguo Wang · Wayne, US
• Eric Jones · Limerick, IE
• Casper F. Stark · Pompton Lakes, US
• John H. Dumbleton · Ridgewood, US
• Ruey Y. Lin · Williamsville, US

Key dates

• Filing date: Nov 5, 2001
• Grant date: Oct 28, 2003
• Expiry date: Nov 15, 2021

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2310/00796
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

According to the present invention a prosthetic bearing component is formed from a composite synthetic plastics material comprising an injection molded thermoplastic polymeric matrix reinforced by a pitch based carbon fiber and having a bearing surface which has been machined with a surface roughness with a value less than Ra 2 &mgr;m. Such components have shown superior wear qualities. Preferably the bearing surface shape is machined with tolerances of 0.1 to 0.15 mm. The composite material must be capable of withstanding a radiation value of at least 2.8 Mega Rads (MRad). In components in which the bearing surface is substantially or part spherical a sphericity of 0.3 &mgr;m within a solid angle of 45° is required.