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Apnea detector

  • US 4,765,340 A
  • Filed: 04/02/1986
  • Issued: 08/23/1988
  • Est. Priority Date: 04/02/1985
  • Status: Expired due to Fees
First Claim
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1. An apnea detector comprising:

  • means for measuring oxygen saturation in blood to produce a measured oxygen saturation signal indicating the measured oxygen saturation;

    means for storing a normal oxygen saturation of a normal condition to produce a normal oxygen saturation signal;

    means for storing an increasing speed of oxygen saturation;

    means for comparing the measured oxygen saturation signal with the normal oxygen saturation signal to produce a first detecting signal when the measured oxygen saturation is larger than the normal oxygen saturation stored;

    means for calculating an increasing speed of oxygen saturation based on a plurality of the measured oxygen saturation signals to produce a second detecting signal when the calculated increasing speed of oxygen saturation is higher than the stored increasing speed of oxygen saturation; and

    means for detecting recovery from apnea condition in accordance with the first and second detecting signals.

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