Maro Publications

UHMWPE Implants

Patent Abstracts

From 03/19/2014  
to 4/25/2012

Maro Topics

UHMWPE Implants: Patent Titles

UHMWPE Implants: Notes

 

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Patents with Abstracts

2. 8,241,564 
Polyethylene cross-linked with an anthocyanin
 
He et al of Howmedica Osteonics Corp., New Jersey, developed a method for manufacturing of ultrahigh molecular weight polyethylene (UHMWPE) for implants, where the implants have been machined out of UHMWPE blocks or extruded rods containing dispersed anthocyanin.  The implant is then exposed to .gamma. ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear. The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135.degree. C.-250.degree. C. and pressures in a range of approximately 2-70 MPa. (RDC 8/17/2012)

1. 8,133,436 
Polyethylene cross-linked with an anthocyanin
 
He et al of Howmedica Osteonics Corp, New Jersey developed  an ultrahigh molecular weight polyethylene (UHMWPE) with dispersed anthocyanin for implants, where the implants have been machined out of UHMWPE blocks or extruded rods.  The implant is then exposed to gamma. ray or electron beam irradiation in an amount of at least 2.5 Mrad followed by a heat treatment to prevent the implant from becoming brittle in the long term as well as to improve strength and wear.  The method includes mixing a powder or granulate resin of UHMWPE with an aqueous liquid that contains anthocyanin in a predetermined amount. The water is then evaporated in order to deposit the anthocyanin in a predetermined concentration on the polyethylene particles. The doped UHMWPE particles are compressed into blocks at temperatures in a range of approximately 135.degree. C.-250.degree. C. and pressures in a range of approximately 2-70 MPa. Medical implants are made from the blocks. (RDC 4/25/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
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E-Mail: cornelrd@bee.net  

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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.