a rotor cooperating with {HEAD ~ said stator} to pump {TAIL ~ blood} axially through said pump 
to pump
a rotor cooperating with { HEAD ~ said stator } to pump { TAIL ~ blood } axially through said pump
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH