. . . "The biomedical materials as shaped articles are composed of thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polyesters, polyamides, polycarbonates, polyurethanes, silicone resins and fluorocarbon resins; elastomers such as natural rubbers, synthetic rubbers, polyester ether elastomers and polyester ester elastomers; cellulose derivatives such as acetyl cellulose; and" .