Anesthesia monitoring system based on electroencephalographic signals
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United States of America Patent
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N/A
Issued Date -
Jun 27, 2002
app pub date -
Nov 13, 2001
filing date -
Nov 2, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system which classifies patients according to their level of awareness or consciousness using measures derived solely from electroencephalograph (EEG) signals. The system comprises multiple observes of characteristics of signals, including artifact detectors, especially magnitude artifact detectors, eye blink detectors, stationarity/RMS detectors, slew rate detectors, and burst suppression detectors, and determination of power in certain frequency bands. The system produces a single derived probabilistic measure of conscious awareness called the patient state index (PSI) and displays values of trends in that index and values of an artifact index, an EMG index, and a suppression ratio in order to give the operator current information on the quality of the signal input. The PSI is derived from a statistical analysis using empirically derived population norms and other parameters.
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