Monitor system for determining the sleep stages of a person

Details Monitor system for determining the sleep stages of a person Monitor system for determining the sleep stages of a person

1992-10-19

1994-01-25

Kamm, William E.

Surgery

Truss

Pad

128708, A61B 50402

Patent

active

052807916

ABSTRACT:
A simple system for determining a non-invasive sleep state of a person is described. The system comprises: (a) means for measuring the person's cardiac R-R waves interval; (b) means for calculating the power spectrum of the cardiac R-R interval, thus obtaining a ratio between spectral power in the and high frequencies; (c) means responsive to the measuring and calculating means for generating output signals, one output signal having a first value when said ratio is above a specific predetermined threshold, designated as REM sleep-and one outputs signal having a second value when the above ratio is below this threshold, designated as non-REM sleep, and (d) means responsive to the output signal for designating a time period of predetermined duration as a REM period or a non-REM period, respectively. The system enables an accurate determination of the sleep state.

REFERENCES:
patent: 4784162 (1988-11-01), Ricks et al.
patent: 4836219 (1989-06-01), Hobson et al.
1: "Ethology of Sleep Studied with Time-Lapse Photography: Postural Immobility and Sleep-Cycle Phase in Humans," J. Allan Hobson, et al., Science, vol. 201, Sep. 29, 1978, pp. 1251-1253.

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