Sleep screening system with time based modulated data

Details Sleep screening system with time based modulated data Sleep screening system with time based modulated data

1989-01-24

1991-03-12

MacDonald, Allen R.

Boots, shoes, and leggings

728709, 728711, G06F 1542, A61B 50205

Patent

active

049997726

ABSTRACT:
A portable sleep monitoring system for recording on tape, transcribing and charting a plurality of physiologic data channels recorded relative to a known constant, user-transparent time base. Selected ECG, air flow, impedance and pulse oximetry sensor inputs are recorded under microprocessor control relative to a crystal controlled 40 Hz signal modulated with the physiologic data from one of the sensors. Upon reading the physiologic data from tape and/or charting, the collected data is displayed with the time base, normalized to the known crystal controlled timing signal. In the heart rate mode, QRS occurences are displayed on the heart rate trace line as singular hash marks. The presence of motion at the pulse O2 sensor is indicated by multiplexing high frequency hash markings onto the O2 saturation trace line. Calibration levels relating to four different O2 saturation percent vales are periodically written to tape for reference during tape reading.

REFERENCES:
patent: 4784162 (1988-11-01), Ricks et al.
patent: 4836219 (1989-06-01), Hobson et al.

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