| http://www.w3.org/ns/prov#value | - Although elastic body 15 is shown as one piece in, for example, FIGS. 1-4, it may be made from one or several pieces. [0068] Elastic body 15 may be formed from a wide variety of biocompatible polymeric materials, including elastic materials, such as elastomeric materials, hydrogels or other hydrophilic polymers, or composites thereof.
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