In {HEAD ~ use}, {TAIL ~ the pump} preferably includes a fluid having one or more drugs disposed in at least one of the reservoirs, and a radiolucent fluid disposed in one of the reservoirs 
In { HEAD ~ use } , { TAIL ~ the pump } preferably includes a fluid having one or more drugs disposed in at least one of the reservoirs , and a radiolucent fluid disposed in one of the reservoirs
OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH