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Ultrasonic air-in-line detector for a medication infusion system

  • US 5,064,412 A
  • Filed: 09/05/1989
  • Issued: 11/12/1991
  • Est. Priority Date: 09/05/1989
  • Status: Expired due to Term
First Claim
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1. A system for detecting the presence of a significant amount of air in fluid passing through a fluid passageway, comprising:

  • ultrasonic sensor means disposed adjacent said fluid passageway for providing an air-in-line output signal indicative of whether there is presently air or fluid in said fluid passageway at the location monitored by said ultrasonic sensor means;

    means for monitoring the volume pumped through said fluid passageway, said monitoring means providing a volume output signal indicative of the volume pumped;

    means, responsive to said air-in-line output signal and said volume output signal, for calculating the volume of air contained in the last predetermined volume pumped through said fluid passageway, said calculating means providing as an output the volume of air contained in the last predetermined volume pumped; and

    means for providing an alarm signal if the output from said calculating means is equal to or greater than a second predetermined volume.

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