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Oximeter probe off indicator defining probe off space

  • US 9,370,326 B2
  • Filed: 09/11/2012
  • Issued: 06/21/2016
  • Est. Priority Date: 10/12/2006
  • Status: Active Grant
First Claim
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1. In a pulse oximetry system including a noninvasive optical probe and a pulse oximeter including a memory, a method of determining that said optical probe is not properly positioned with respect to a measurement site on a patient, the method comprising:

  • providing said probe and said oximeter, said memory of said oximeter including measurements collectively defining a probe off space, said probe off space determined by at least the following;

    receiving one or more first signals from a different noninvasive optical probe positioned proximate a different patient or proximate no patient, said first signals normally responsive to light attenuated by body tissue at said measurement site of said different patient, however, said first signals being received by said different probe during known probe off conditions, said light corresponding to emission centroids configured to be centered at least one pair of (i) 610 nm and 620 nm, (ii) 610 nm and 630 nm, or (iii) 620 nm and 630 nm,processing said first signals to produce said measurements, anddefining said probe off space from analysis of said measurements, said probe off space being multi-dimensional and separate from a valid parameter space, wherein said defining said probe off space comprises increasing a number of dimensions in said multi-dimensional probe off space, thereby increasing separation between said probe off space and said valid parameter space representing measurements of valid parameters;

    receiving one or more second signals from said noninvasive optical probe;

    processing said second signals to produce current measurements;

    comparing said probe off space stored in said memory with said current measurements to determine whether said current measurements fall within said probe off space; and

    when said current measurements fall within said probe off space, outputting a probe off indication.

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