{HEAD ~ The surgical port} generally comprises {TAIL ~ a hollow, thin walled flexible tubular body} provided with a thin walled flexible annular flange at one end of the tubular body 
generally comprises
{ HEAD ~ The surgical port } generally comprises { TAIL ~ a hollow , thin walled flexible tubular body } provided with a thin walled flexible annular flange at one end of the tubular body
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH