| http://www.w3.org/ns/prov#value | - Elastomeric layer 500 is preferably manufactured from a biocompatible material such as silicone rubber, polyurethane, synthetic or natural rubber approved for implant use, elastic hydrogels, polyvinyl alcohol, or other like substantially elastic biocompatible materials that do not considerably rigidify the structure of underlying U-shaped frame member 210.
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