Maro Publications

Crosslinking Polyethylene

Patents with Abstracts

*4/19/2012

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Patents with Abstracts

8,178,594 
Antioxidant stabilized crosslinked ultra-high molecular weight polyethylene for medical device applications
 
Rufner et al of Zimmer, Indiana, combined an antioxidant such as tocopherol with UHMWPE prior to crosslinking irradiation.  After the antioxidant is combined with the UHMWPE, the resulting blend may be formed into slabs, bar stock, and/or incorporated into a substrate, such as a metal, for example.  The resulting product may, then, be subjected to crosslinking irradiation. In one exemplary embodiment, the UHMWPE blend is preheated prior to subjecting the same to crosslinking irradiation.  Once irradiated, the UHMWPE blended product may be machined, packaged, and sterilized in accordance with conventional techniques. (RDC 5/29/2012)

8,137,608 
Crosslinked polymeric material with enhanced strength and process for manufacturing
 
Schroeder et al of Biomet Manufacturing, Indiana, developed a radiation crosslinked (50 kGy), pressure-treated UHMWPE material 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.  (RDC 5/14/2012)

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 4/19/2012.