| http://www.w3.org/ns/prov#value | - In a further embodiment of either of these two constructions, the sheet may be formed of an expanded, porous, or sponge-like biocompatible polymer, or of a copolymer, for example made of a polyurethane and a PTFE, to achieve particular physical properties, such as enhanced elasticity or tensile strength, chemical compatibility, and the like.
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