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Fluid delivery apparatus

  • US 5,205,820 A
  • Filed: 04/17/1992
  • Issued: 04/27/1993
  • Est. Priority Date: 06/16/1989
  • Status: Expired due to Term
First Claim
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1. A device for use in infusing fluids into an ambulatory patient at a controlled rate comprising:

  • (a) a base having a fluid inlet and fluid outlet interconnected by a fluid flow path;

    (b) filling means for introducing fluid into said fluid inlet;

    (c) a distendable membrane constructed of an elastic material which is fitted over said base to define a chamber in communication with said fluid inlet and said fluid outlet, said membrane being distendable by fluid introduced into said chamber under pressure through said fluid inlet, said membrane having a tendency to return to a substantially nondistended configuration whereby fluid within said chamber will be expelled through said fluid outlet; and

    (d) adding means disposed within said fluid flow path for adding an additive to fluid flowing therethrough.

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