Multiple reservoir implantable drug infusion device and method
First Claim
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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Accused Products
Abstract
Multiple reservoir implantable valve accumulator pump for the delivery of medication, and method of infusate delivery. The apparatus includes at least first and second infusate reservoirs in a common pressure chamber, each in fluid communication with a metering assembly. The metering assembly includes an accumulator that is preferably a fixed volume accumulator having an inlet and an outlet. A first valve is in fluid communication with the first infusate reservoir and an inlet of the accumulator, and a second valve is in fluid communication with the second infusate reservoir and an inlet of the accumulator. An outlet valve is in fluid communication with the outlet of the accumulator. The accumulator can be filled with infusate from the first and second infusate reservoirs sequentially, can be filled from the first infusate reservoir multiple times consecutively, the second infusate reservoir multiple times consecutively, or any combination or permutation thereof.
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Citations
14 Claims
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1. An implantable infusion apparatus, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification