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