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Parallel alarm processor

  • US 7,355,512 B1
  • Filed: 03/13/2007
  • Issued: 04/08/2008
  • Est. Priority Date: 01/24/2002
  • Status: Expired due to Term
First Claim
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1. A parallel alarm processor comprising:

  • a sensor signal responsive to multiple wavelengths of light transmitted into a tissue site and detected after attenuation by pulsatile blood flow within the tissue site;

    a first processor having an input responsive to the sensor signal and a smoothing output responsive to relatively long duration oxygen desaturations;

    a second processor having an input responsive to the sensor signal and a predictor output responsive to relatively short duration, intermittent oxygen desaturations;

    a threshold detector responsive to the smoothing output so as to generate a first alarm when the smoothing output crosses a predetermined threshold; and

    a pattern processor responsive to the predictor output so as to generate a second alarm when a predetermined pattern is detected in a series of oxygen desaturations.

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