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