Infusion apparatus

  • US 5,105,983 A
  • Filed: 10/31/1989
  • Issued: 04/21/1992
  • Est. Priority Date: 10/31/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for dispensing a liquid under pressure at a substantially constant flow rate over a period of time comprising:

  • a housing having a first chamber for containing a holding reservoir and a second chamber for containing a pressure reservoir;

    said second chamber being a substantially spherical chamber and an opening into said spherical chamber;

    an elongated support member disposed in said spherical chamber and having an end disposed at said opening;

    elastic means mounted on said support member in said spherical chamber for defining a pressure reservoir for holding a liquid in a pressurized state for dispensing therefrom;

    inlet means for introducing a liquid into said pressure reservoir;

    outlet means for dispensing liquid from said pressure reservoir to a selected site;

    a holding reservoir in said first chamber for containing a predetermined quantity of a liquid in a non-pressurized state to be dispensed;

    means for connecting said holding reservoir to said pressure reservoir for enabling the transfer of said liquid thereto;

    said holding reservoir is formed of a pliable plastic material having a neck and an opening in said neck for transferring said liquid to said pressure reservoir; and

    means in said first chamber for collapsing said holding reservoir comprising opposed moveable walls moveable toward one another for forcing liquid from said holding reservoir to said pressure reservoir.

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