It is {HEAD ~ an object} of {TAIL ~ the invention} to reduce the risk of microembolic cereberal vessel occlusion when treating a stenosed cerebral artery 
of
It is { HEAD ~ an object } of { TAIL ~ the invention } to reduce the risk of microembolic cereberal vessel occlusion when treating a stenosed cerebral artery
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH