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