×

Fluid pump for a flexible, variable geometry reservoir

  • US 5,342,313 A
  • Filed: 11/02/1992
  • Issued: 08/30/1994
  • Est. Priority Date: 11/02/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. An infusion pump for delivering a controlled rate of an intravenous fluid from a reservoir to a patient, the infusion pump comprising:

  • a flexible, variable geometry reservoir containing intravenous fluid and having an outlet to allow the exit of fluid therefrom when the volume V of the reservoir is reduced;

    a chamber containing the reservoir and having initial volume greater than the reservoir, the chamber having volume σ

    which can be reduced;

    means for reducing the chamber volume incrementally by dσ and

    the volume of the reservoir therein incrementally by dV which is associated with dσ

    at specific chamber volume σ

    ; and

    programmable controller having a memory, the controller communicating with the chamber volume reducing means to control the rate of reduction of the chamber volume, wherein the controller, upon actuation, reduces the chamber volume according to the formula
    
    
    space="preserve" listing-type="equation">dσ

    =dV·

    S.sub.σ

    where S.sub.σ

    is the previously determined relationship of reservoir volume reduction to chamber volume reduction at chamber volume σ

    , and wherein the controller controls dσ

    by determinations from values of dV and S.sub.σ

    contained in the controller memory.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×