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Method and apparatus for the estimation of anesthetic depth using wavelet analysis of the electroencephalogram

  • US 20040010203A1
  • Filed: 07/11/2003
  • Published: 01/15/2004
  • Est. Priority Date: 07/12/2002
  • Status: Active Grant
First Claim
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1. A method for extracting information from an observed signal representing measured brain activity of a subject in order to evaluate the state of the CNS of said subject, said method comprising:

  • a) acquiring a plurality of reference signals, each said reference signal corresponding to a distinct CNS state obtained from a reference subject or subjects;

    b) selecting a transformation function which, when applied to one of said reference signals or said observed signal, yields a set of coefficients;

    c) selecting a statistical function which, when applied to said set of coefficients derived from one of said reference signals, or a subset of said set of coefficients, yields a reference data set which characterizes the distinct CNS state corresponding to said set of coefficients;

    d) applying said transformation and statistical function to said plurality of reference signals to produce a plurality of reference data sets which distinguish between the distinct CNS states corresponding to said reference signals;

    e) observing the brain activity of said subject to produce said observed signal;

    f) applying said transformation and statistical function to said observed signal to produce an observed data set;

    g) comparing the observed data set to one or more of said reference data sets; and

    h) computing a numerical value or values representative of said state of the CNS of said subject which results from said comparison.

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