The valve body includes an opening in one side thereof which forms {HEAD ~ a seal} around {TAIL ~ a catheter} enclosed within the cannula 
around
The valve body includes an opening in one side thereof which forms { HEAD ~ a seal } around { TAIL ~ a catheter } enclosed within the cannula
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH