A retainer ring can be installed at the end of the tubular body opposite to {HEAD ~ the flange} to secure {TAIL ~ the surgical port} in the body wall 
to secure
A retainer ring can be installed at the end of the tubular body opposite to { HEAD ~ the flange } to secure { TAIL ~ the surgical port } in the body wall
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH