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Method of purging air from a medical fluid machine

  • US 7,662,286 B2
  • Filed: 02/12/2009
  • Issued: 02/16/2010
  • Est. Priority Date: 05/24/2002
  • Status: Expired due to Term
First Claim
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1. A method of purging air from a medical fluid machine,comprising:

  • furnishing a medical fluid pump in a medical fluid machine for pumping a medical fluid, the pump having a single inlet/outlet port connected to a valve manifold;

    connecting a source of medical fluid to the valve manifold;

    drawing the medical fluid into a chamber of the medical fluid pump by retracting a piston in communication with a membrane of the medical fluid pump;

    sensing for air in the medical fluid as the medical fluid is drawn into the chamber;

    pumping the medical fluid through the valve manifold to a patient, if no air is detected, by extending the piston in communication with the membrane; and

    purging the medical fluid through the valve manifold to an entrained air destination, if air is detected, by extending the piston in communication with the membrane, wherein the entrained air destination is a destination different from the patient.

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