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Adaptive alarm system

DC CAFC
  • US RE47,218 E1
  • Filed: 01/26/2018
  • Issued: 02/05/2019
  • Est. Priority Date: 03/01/2010
  • Status: Active Grant
First Claim
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1. A system for reducing electronic alarms in a medical patient monitoring system, the system comprising:

  • an optical sensor configured to transmit optical radiation into a tissue site of a patient and detect attenuated optical radiation indicative of at least one physiological parameter of a patient; and

    one or more hardware processors in electronic communication with the optical sensor, the one or more hardware processors configured to;

    measuredetermine oxygen saturation values of athe patient over a first period of time;

    determine ifwhen at least one oxygen saturation value obtained over the first period of time exceeds a first alarm threshold;

    , determine whether a first alarm should be triggered based on the determination that the at least one oxygen saturation value obtained over the first period of time exceeds the first alarm threshold;

    determineaccess a second alarm threshold to be applied during a second period of time subsequent to the first period of time, the second alarm threshold replacing the first alarm threshold, wherein the second alarm threshold being determined by;

    comparing at least a first oxygen saturation value obtained during the first time period with a lower limit associated with oxygen saturation; and

    computing a second alarm threshold based on the comparison where the second alarm threshold is computed to be at has a value less than the at least first one oxygen saturation value and greater than the a lower limit and at an offset from the first at least one oxygen saturation value, wherein the offset is configured to diminish is diminished as a difference between the at least first oxygen saturation value and the lower limit diminishes;

    measuredetermine oxygen saturation values of athe patient over the second period of time to determine at least a second oxygen saturation value; and

    determine whethertrigger a second alarm should be triggered by determining ifbased on at least one value of the oxygen saturation valuevalues obtained duringover the second period of time exceedsexceeding the second alarm threshold and triggering an alarm if it is determined the second alarm should be triggered.

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