Instrument and methods for filling an implanted drug pump

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(57) Abstract : A tool for refilling an implantable pump (100) having at least one reservoir (104). The tool includes a plurality of independent fluid channels (212, 214, 216); a fluid reservoir in fluid communication with a first one of the fluid channels; at least one pump fluidly coupled to the fluid channels, the at least one pump and the independent fluid channels differing from each other in number, wherein (i) a pump is configured to apply positive pressure to the first fluid channel so as to drive fluid from the fluid reser - voir therethrough, and (ii) a pump is configured to apply negative pressure to the second fluid channel; and a connector (2 1 0) for re - movably connecting the fluid channels to the at least one reservoir.