The catheter carries {HEAD ~ an inflatable occlusion balloon} capable of being formed into a funnel with the larger end of {TAIL ~ the funnel} facing distally 
The catheter carries { HEAD ~ an inflatable occlusion balloon } capable of being formed into a funnel with the larger end of { TAIL ~ the funnel } facing distally
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH