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Apparatus for diagnostic gas analysis

  • US 8,597,580 B2
  • Filed: 11/16/2010
  • Issued: 12/03/2013
  • Est. Priority Date: 09/16/2002
  • Status: Active Grant
First Claim
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1. A device for diagnostic measurement of NO in exhaled breath, comprising:

  • an NO scrubber;

    an inlet/outlet through which a patient inhales air via the NO scrubber and exhales at a first flow rate and pressure dependent on the patient'"'"'s control over the patient'"'"'s exhalation;

    an NO sensor that analyzes a sample of the exhaled breath during an analysis period to detect a level of NO in the sample of the exhaled breath;

    a buffer chamber defining a volume and that temporarily stores the sample of the exhaled breath before analysis by the NO sensor;

    a flow controller disposed between the buffer chamber and the NO sensor that allows passage of the sample of exhaled breath to the NO sensor during the analysis period; and

    a sample feeder in the form of a sample pump or a fan that actively feeds the sample of exhaled breath from the buffer chamber to the NO sensor at a predetermined and constant second flow rate over the analysis period, wherein the second flow rate is smaller than the first flow rate.

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