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Pulse oximeter probe-off detector

  • US 20040158134A1
  • Filed: 11/25/2003
  • Published: 08/12/2004
  • Est. Priority Date: 03/25/1999
  • Status: Active Grant
First Claim
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1. A probe-off detector providing an indication that a physiological sensor may not be properly positioned proximate a tissue site, said probe-off detector comprising:

  • a signal quality input that defines an acceptable operating region for the sensor;

    a signal strength calculator comprising an input in communications with a sensor signal from a sensor; and

    a signal strength output dependent on a time-varying component of the sensor signal;

    a stored relationship between the signal strength output and the signal quality input; and

    probe-off logic providing a probe-off output based on a comparison of the signal strength output and the signal quality input with said stored relationship.

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