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Medical fluid machine with air purging pump

  • US 7,500,962 B2
  • Filed: 07/22/2005
  • Issued: 03/10/2009
  • Est. Priority Date: 05/24/2002
  • Status: Expired due to Term
First Claim
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1. A medical fluid apparatus, comprising:

  • a diaphragm pump for pumping a medical fluid;

    an inlet of the diaphragm pump, connected to a source of the medical fluid;

    a piston in the diaphragm pump connected to a membrane in the diaphragm pump, the membrane forming a chamber within the diaphragm pump;

    a valve manifold connected to the chamber by a single inlet/outlet port;

    a source of the medical fluid connected to the valve manifold;

    a sensor for sensing air in the medical fluid or in the chamber;

    an outlet of the pump valve manifold connected to a patient, wherein if no air is detected, the medical fluid is pumped to the patient by extending the piston connected to the membrane; and

    an entrained air destination connected to the outlet of the pump valve manifold, the entrained air destination different from the patient, wherein if air is detected, the medical fluid is pumped to the entrained air destination by extending the piston.

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