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Method and system for analysis of long term physiological polygraphic recordings

  • US 5,299,118 A
  • Filed: 09/05/1991
  • Issued: 03/29/1994
  • Est. Priority Date: 06/26/1987
  • Status: Expired due to Fees
First Claim
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1. A system for analyzing physiological signals obtained from physiological sensors n a subject to determine stages of sleep comprising:

  • (a) means for receiving time varying physiological signals from the sensors on the subject and for digitizing the signals to provide digital physiological signal data;

    (b) means for storing the digitized physiological signal data in correlation with time and making such data available for later long term retrieval;

    (c) analysis means receiving the digital physiological signal data for initially analyzing the data on a real time basis to detect patterns therein indicating fluctuations in physiological function using criteria, wherein the analysis means analyses the data to determine the physiological function of sleep to produce an analysis result, and wherein the physiological sensor signals include time varying EEG signal data, and wherein the analysis means includes means for separating the time varying EEG signal data into a plurality of signals corresponding to frequency bands generally conforming to the frequencies of standard EEG waveform components, including frequencies for delta waves, the theta waves, beta waves and sleepspindles;

    (d) display means including a display screen for displaying to an operator on the display screen the results of the analysis from the analysis means on a real time basis, wherein the display means displays the results of the analysis as a hypnogram of the stages of sleep as a function of time;

    (e) input means receiving commands from the operator for providing new criteria specifications from the operator to the analysis means, wherein the analysis means includes means for reanalyzing the physiological data stored for long term retrieval utilizing the new criteria for determining fluctuations in physiological function, wherein the display means includes means for, during reanalysis, displaying to the operator a matrix of emulated classification rules having characterizing parameters listed on one axis of the matrix and classes on the other axis of the matrix, and for displaying reference levels and rules to the operator in matrix elements for the initial analysis, and wherein the input mans includes means for receiving input from the operator to change the reference level or rules indicated in the elements of the matrix to a level or rule desired by the operator, and the analysis means further includes means for analyzing the data utilizing the new reference levels and rules as modified by the operator to carry out the classification.

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