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Multiple reservoir implantable drug infusion device and method

  • US 8,551,044 B2
  • Filed: 03/05/2008
  • Issued: 10/08/2013
  • Est. Priority Date: 03/05/2008
  • Status: Active Grant
First Claim
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1. An implantable infusion apparatus, comprising:

  • a housing defining a pressure chamber that contains a fluid having positive vapor pressure at normal body temperature;

    a first infusate reservoir defined within said pressure chamber and maintained at a positive pressure by said fluid that is external to said first infusate reservoir;

    a second infusate reservoir oppositely disposed to said first infusate reservoir and defined within said pressure chamber and maintained at a positive pressure by said fluid that is external to said second infusate reservoir, wherein said first and second infusate reservoirs are individually expandable to a selected portion respectively of a total available volume of the pressure chamber, the first infusate reservoir expanding in a first direction and the second infusate reservoir expanding in a second direction that is opposite the first direction;

    a metering assembly comprising a fixed volume accumulator having an inlet and an outlet, said accumulator comprising a chamber housing a flexible diaphragm that provides a barrier between a gas portion of the chamber and an infusate portion of the chamber;

    a first valve in fluid communication with said first infusate reservoir and said inlet of said accumulator;

    a second valve in fluid communication with said second infusate reservoir and said inlet of said accumulator;

    an outlet valve providing fluid communication through said outlet of said accumulator; and

    a control module programmed to actuate said first valve, said second valve, and said outlet valve.

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