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Oximeter with motion detection for alarm modification

  • US 5,662,106 A
  • Filed: 01/29/1996
  • Issued: 09/02/1997
  • Est. Priority Date: 03/26/1993
  • Status: Expired due to Fees
First Claim
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1. A method of operating a pulse oximeter which emits light, the method comprising the steps of:

  • (a) qualifying pulses in a detector signal, the detector signal corresponding to absorption by blood constituents of the light emitted by the oximeter;

    (b) upon a condition suggesting a possible alarm situation, setting a first timer, the first timer expiring upon elapse of a time interval of a first predetermined duration;

    (c) if a pulse is detected in the detector signal after the first timer has been set and before the first timer expires, performing the steps of;

    (c1) determining if the pulse has resulted from motion artifact; and

    (c2) if the pulse is determined to have resulted from motion artifact, resetting the first timer; and

    (d) if and when the first timer expires, generating an alarm.

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