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Method for pumping fluid from a flexible, variable geometry reservoir

  • US 5,232,439 A
  • Filed: 11/02/1992
  • Issued: 08/03/1993
  • Est. Priority Date: 11/02/1992
  • Status: Expired due to Fees
First Claim
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1. A method of infusing a fluid from a variable geometry reservoir into a patient using a pump having a chamber with initial volume greater than the reservoir, the chamber capable of containing the reservoir, the chamber having reducible volume which in turn reduces the volume of the reservoir, the chamber also having a means for reducing its volume and a programmable controller for controlling the volume reducing means, the controller having a memory, the method comprising the steps of:

  • (a) electronically determining in the controller the volume of the chamber to be reduced according todσ

    =dV·

    S94 where dV is the incremental reservoir volume reduction associated with incremental chamber volume reduction dσ

    at chamber volume σ

    , and S.sub.σ

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

    , wherein the controller determines dσ

    of the chamber volume by determinations from values of dV and Sσ

    in the memory; and

    (b) electronically actuating the volume reducing means according to the determinations of the controller.

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