U.S. Patent 8,933,145 (January 13, 2015), "High Temperature Melting," Ebru Oral and Orhun K. Muratoglu (The General Hospital Corp., Boston, Massachusetts, USA).
Ultrahigh molecular-weight polyethylene (UHMWPE) materials are useful implant materials, but total joint implants need improved oxidative stability and wear resistance. Wear resistance can be improved by crosslinking. However, crosslinking reduces toughness and ductility.
Oral and Muratoglu produced crosslinked, wear- and oxidation-resistant, tough, and ductile UHMWPE materials by localized, high-temperature melting. They irradiated a starting material containing antioxidants with ionizing radiation and then heated the irradiated material to 200[degrees]C. After cooling, the material showed enhanced wear resistance and oxidation resistance without noticeable degradation in the other desirable properties. This process is carried out in 1 to 22% oxygen with a radiation dose of 25 to 1000 kGy.
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|Title Annotation:||INDUSTRY PATENTS; Ultrahigh molecular weight polyethylene|
|Article Type:||Brief article|
|Date:||Apr 1, 2015|
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