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Oximeter probe off indicator defining probe off space

  • US 8,265,723 B1
  • Filed: 10/12/2007
  • Issued: 09/11/2012
  • Est. Priority Date: 10/12/2006
  • Status: Active Grant
First Claim
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1. A method of determining whether an optical probe in an oximetry system is improperly positioned, the method comprising:

  • acquiring data responsive to light attenuated by body tissue;

    comparing characteristics of said data to a probe off space, wherein at least a portion of said probe off space comprises data acquired during known probe off conditions; and

    when said characteristics fall within said probe off space, outputting a probe off indication capable of alerting a caregiver to an improperly positioned probe condition,wherein said characteristic comprises normalized data channels corresponding to at least two emitted wavelengths of light, and wherein said at least two emitted wavelengths of light are selected to reduce a likelihood of overlap between said probe off space and probe on space.

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