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