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Automated drug infusion system with autopriming

  • US 5,496,273 A
  • Filed: 07/05/1994
  • Issued: 03/05/1996
  • Est. Priority Date: 12/20/1991
  • Status: Expired due to Term
First Claim
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1. A pumping system for providing positive displacement, volumetric liquid control comprising:

  • a liquid supply channel having a liquid supply inlet for receiving liquid from a liquid supply;

    a pump included in said liquid supply channel and having a pumping chamber with a pumping chamber inlet and a pumping chamber outlet;

    at least one detector, located in said liquid supply channel between the liquid supply inlet and a pumping system outlet, for detecting air in liquid flowing through the liquid supply channel;

    a first valve and valve actuator for regulating liquid flow through the liquid supply inlet and a second valve and valve actuator for regulating liquid flow through the pumping system outlet; and

    a controller responsive to an output from the detector for controlling the pump, the first valve actuator and the second valve actuator during a bi-directional priming of the liquid supply channel until a quantity of air in liquid within the liquid supply channel corresponds to a predetermined value.

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