In use, the catheter is positioned so that the atherectomy assembly lies within a region of {TAIL ~ interest}, the filtration apparatus is deployed downstream of the region of interest, {HEAD ~ the plaque} is trapped and held by a snare, vacuum, or other trapping means, and then the excising mechanism is activated to remove the plaque 
In use , the catheter is positioned so that the atherectomy assembly lies within a region of { TAIL ~ interest } , the filtration apparatus is deployed downstream of the region of interest , { HEAD ~ the plaque } is trapped and held by a snare , vacuum , or other trapping means , and then the excising mechanism is activated to remove the plaque
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH