| http://www.w3.org/ns/prov#value | - For covered medical device surfaces, such as those covered with a polymer like polytetrafluoroethylene (PTFE) or expanded PTFE (TEFLON), fluorinated ethylene propylene, polytetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylchloride, polypropylene, polyethylene terephthalate, polyurethane, polyureas, fibrins, broad fluoride, silicone and other biocompatible materials, exposure to o
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