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Pulse oximeter probe-off detector

  • US 9,730,640 B2
  • Filed: 09/10/2013
  • Issued: 08/15/2017
  • Est. Priority Date: 03/25/1999
  • Status: Expired due to Fees
First Claim
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1. A patient monitor configured to obtain signals responsive to physiological parameters of a monitored patient and determine when a physiological sensor may not be properly attached to said monitored patient with respect to a measurement site, the patient monitor comprising:

  • one or more processors configured to;

    receive a sensitivity mode setting;

    determine a signal strength limit based at least in part on the sensitivity mode setting;

    determine a signal strength of one or more signals indicative of one or more physiological parameters of a monitored patient, wherein the one or more signals comprise a plurality of pulses, each pulse comprising a plurality of pulse features;

    perform one or more checks on one or more pulse features to determine one or more physiologically acceptable pulses from the plurality of pulses, wherein the one or more features include at least one of pulse starting point, pulse period, or pulse signal strength;

    determine a pulse rate density indicative of a percentage of time physiologically acceptable pulses occur;

    determine a sensor not properly attached condition exists when the signal strength and the pulse rate density fall within a probe off region, wherein the probe off region is associated with the signal strength limit and wherein the probe off region corresponds to operating conditions outside an acceptable operating range; and

    indicate an alarm condition responsive to a determination that the sensor not properly attached condition exists.

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