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