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Liquid delivery device

  • US 5,398,851 A
  • Filed: 08/06/1993
  • Issued: 03/21/1995
  • Est. Priority Date: 08/06/1993
  • Status: Expired due to Term
First Claim
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1. A controllable liquid delivery device comprising:

  • a hollow casing having a fluid impermeable wall, an inner surface of said wall surrounding and forming an open interior of said casing;

    a flexible fluid impermeable membrane disposed within said interior and separating a liquid chamber from a propellant chamber;

    a liquid filling said liquid chamber;

    an outlet port through said wall providing fluid communication between said liquid chamber and the exterior of said casing;

    first and second chemicals separately disposed in said propellant chamber, said first and second chemicals reactive with each other such that upon contact said first and second chemicals react to generate a quantity of propellant gas;

    means for controlling the rate at which said first and second chemicals generate the propellant gas;

    barrier means initially separating said chemicals; and

    means operable to allow one of said chemicals to pass through said barrier means and come into contact with the other of said chemicals,whereby, upon activation of said contacting means, said first and second chemicals react to generate said propellant gas, said propellant gas thereupon expanding against said membrane and causing said membrane to move against said liquid, causing the expulsion of said liquid from said liquid chamber.

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