{TAIL ~ A hollow plastic dilator} 60 is then passed through passage 11 of {HEAD ~ the cannula housing} and is slid over guide 61 
{ TAIL ~ A hollow plastic dilator } 60 is then passed through passage 11 of { HEAD ~ the cannula housing } and is slid over guide 61
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH