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Bubble detection system

  • US 5,059,171 A
  • Filed: 06/21/1990
  • Issued: 10/22/1991
  • Est. Priority Date: 06/21/1990
  • Status: Expired due to Fees
First Claim
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1. In a fluid delivery system in which a liquid is delivered through a conduit leading to a patient, a bubble detection means comprising:

  • pump means for delivering liquid through the conduit toward the patient;

    control means adapted to control the movement of said pump means;

    detector means adapted to monitor a parameter indicating the compressibility of the liquid delivered through the conduit and to produce at least one signal representing said parameter;

    comparator means for comparing said at least one signal from said detector means with at least one signal of said same parameter indicative of said pump means delivering a known quantity of an incompressible liquid through the conduit at a specific rate, said comparator means producing a signal when said detected signal indicates that the compressibility of the liquid being delivered is a predetermined amount more than that of said compared signal;

    means responsive to said signal from said comparator to discontinue delivering liquid to the patient and to relieve pressure in said conduit.

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