The implantable drug pump 11, further comprising a user programmable control mechanism coupled to the drug pump and effective to selectively control {HEAD ~ movement} of the at least one valve between {TAIL ~ the open and closed positions} 
The implantable drug pump 11 , further comprising a user programmable control mechanism coupled to the drug pump and effective to selectively control { HEAD ~ movement } of the at least one valve between { TAIL ~ the open and closed positions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL