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Air detector for intravenous infusion system

  • US 5,843,035 A
  • Filed: 04/10/1996
  • Issued: 12/01/1998
  • Est. Priority Date: 04/10/1996
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting excessive air in a liquid flow-through tube comprising:

  • an ultrasonic transmitter for transmitting ultrasonic signals the ultrasonic transmitter including an ultrasonic crystal having a thickness and a surface area;

    an ultrasonic receiver for receiving ultrasonic signals the ultrasonic transmitter and ultrasonic receiver being separated by the tube;

    circuit means for generating at least two transmitting signals a first transmitting signal based on the frequency of the thickness of the ultrasonic crystal and a second transmitting signal based on the surface area of the ultrasonic crystal, to actuate the ultrasonic transmitter;

    circuit means for detecting received signals; and

    means for determining whether the received signal is indicative of air or liquid in the tube.

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