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Air-in-line detector infusion system

  • US 5,006,110 A
  • Filed: 12/01/1987
  • Issued: 04/09/1991
  • Est. Priority Date: 12/01/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting the presence of air bubbles in liquid passing through a disposable cassette installed on a main unit in a medication infusion system or the like, comprising:

  • an optical receiving module adapted for mounting on said main unit;

    optical signal source means for providing a light beam, said optical signal source means being located in said optical receiving module;

    optical signal sensor means for receiving said light beam, said optical signal sensor means also being located in said optical receiving module;

    a liquid channel located in a disposable cassette, said liquid channel having a first wall, said liquid channel also having a second wall located opposite said first wall, liquid passing through said disposable cassette passing through said liquid channel in an area between said first wall and said second wall, said first wall being transparent to said light beam from said optical signal source means, said second wall being absorptive of light of the type provided by said optical signal source means, said first wall of said liquid channel being located adjacent said optical receiving module when said disposable cassette is installed on said main unit; and

    an optical viewing area located in said first wall, a first portion of said optical viewing area in said first wall being located adjacent said optical signal source means, a second portion of said optical viewing area in said first wall being located adjacent said optical signal sensor means, said optical viewing area comprising means for reflecting said light beam from said optical signal source means onto said optical signal sensor means when said area of said liquid channel has air therein, said light beam from said optical signal source means thereby passing through said optical viewing area when said area of said liquid channel has liquid therein.

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