The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2008
Filed:
Oct. 13, 2004
David W. Schroeder, Winona Lake, IN (US);
Jordan H. Freedman, Fort Wayne, IN (US);
James E. Gunter, Claypool, IN (US);
Brian D. Salyer, Warsaw, IN (US);
H. Gene Hawkins, Warsaw, IN (US);
David W. Schroeder, Winona Lake, IN (US);
Jordan H. Freedman, Fort Wayne, IN (US);
James E. Gunter, Claypool, IN (US);
Brian D. Salyer, Warsaw, IN (US);
H. Gene Hawkins, Warsaw, IN (US);
Biomet Manufacturing Corp., Warsaw, IN (US);
Abstract
A radiation crosslinked (50 kGy), pressure-treated UHMWPE material has been developed by applying compressive force on a crosslinked polymer in a direction orthogonal to an axial direction. The deformed material is then cooled while held in a deformed state. The resulting material is anisotropic, with enhanced strength oriented along the axial direction. The directionally engineered material is oxidatively stable even after four weeks of accelerated aging in a pressure vessel containing five atmospheres of oxygen (ASTM F2003). Because of its oxidative stability, the deformation processed material is a suitable candidate for air-permeable packaging and gas sterilization, which has thus far been reserved for remelted highly crosslinked UHMWPEs.