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Pulse oximeter probe-off detector

  • US 6,654,624 B2
  • Filed: 12/19/2001
  • Issued: 11/25/2003
  • Est. Priority Date: 03/25/1999
  • Status: Expired due to Term
First Claim
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1. A detector for determining when a physiological sensor may not be properly positioned with respect to a measurement site, the detector comprising:

  • a signal strength calculator which processes an input signal expected to be representative of at least one parameter measured by a physiological sensor to produce an output representative of a strength of the input signal; and

    logic which indicates that the input signal may not represent the parameter when a predetermined portion of the output is below a threshold value, wherein the threshold value comprises a floor value below which a probe-off condition exists for all values of the output, and wherein the floor value comprises a ratio of a first value of a substantially alternating part of the output to a second value of a substantially non-alternating part of the output.

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