The cannula or {HEAD ~ probe tip} 14 is {TAIL ~ a rigid, tubular sleeve} preferably constructed of surgical steel 
is
The cannula or { HEAD ~ probe tip } 14 is { TAIL ~ a rigid , tubular sleeve } preferably constructed of surgical steel
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH