Anesthesia monitoring system based on electroencephalographic signals
US6317627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Nov 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG16H50/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
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 observers 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.