However, any biocompatible material that can be readily compressed and that provides a moderate back force when somewhat compressed, such as {HEAD ~ elastomers} including silicones and {TAIL ~ polyurethanes} and fabrics including those made with polyterefluoroethylene may be used to form fabric tube 50 
including
However , any biocompatible material that can be readily compressed and that provides a moderate back force when somewhat compressed , such as { HEAD ~ elastomers } including silicones and { TAIL ~ polyurethanes } and fabrics including those made with polyterefluoroethylene may be used to form fabric tube 50
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