The physician then dilates {HEAD ~ the hole} through {TAIL ~ the vessel wall} by maneuvering the tapered end 60 of the dilator 56, and introduces the entrance tube 35 into vessel lumen 62 
The physician then dilates { HEAD ~ the hole } through { TAIL ~ the vessel wall } by maneuvering the tapered end 60 of the dilator 56 , and introduces the entrance tube 35 into vessel lumen 62
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH