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Implantable fluid dispensing system

  • US 4,505,710 A
  • Filed: 05/13/1983
  • Issued: 03/19/1985
  • Est. Priority Date: 05/13/1983
  • Status: Expired due to Fees
First Claim
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1. A fluid dispensing device for implantation in a biological system, which comprises:

  • a container having a closed wall, a closed end, and an end having a first and a second aperture;

    a unidirectional flow valve in said first aperture, adapted to conduct fluid away from said container;

    fill valve means in said second aperture adapted to conduct fluid into said container;

    a reciprocable diaphragm in said container, defining a first volume between the closed end of said container and said diaphragm, and a second volume between said diaphragm and said end having first and second apertures;

    a gas in the first volume of said container;

    a first heater in thermal contact with said gas in the first volume in said container, for expanding said gas;

    an expandable container having first and second concentric, closed, expandable walls and first and second ends, in said container, in contact with said diapragm at the first end, and in contact with the aperture end of said container at the second end, said expandable container surrounding a third volume inward from said first and second concentric expandable walls and between said diaphragm and the aperture end of said container;

    a gas in said expandable container; and

    a second heater in thermal contact with said gas in said expandable container for expanding said gas;

    control means connected to said first and second heater adapted to actuate said first and said second heaters autonomously from stored instructions in said control means;

    whereby said control means energizes said heaters differentially, urging said diaphragm in one direction or its opposite, forcing fluid out of said unidirectional valve and alternately drawing in fluid through said fill valve means to fill the dispensable fluid third volume in said container.

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