US 8,784,324 B2 · Sleep monitoring system

Abstract

A sleep monitoring system includes an ECG device (2) and a respiration inductance plethysmogram (3) which monitor cardiac activity and physical (ribcage) respiration respectively and feed representative signals to a digital data processor. Operations (5-9) process the beat interval data, while in a second thread, operations (20-24) independently process the amplitude modulation of the ECG data caused by the respiratory motion of the subject. The inductance plethysmogram device (3) provides an input to the processor which represents respiration as directly monitored independently of the ECG. Operations (30-34) process this direct respiration data independently and in parallel, in a third thread. All extracted features are fed to a classifier which in step (10) combines selected combinations of features to make decisions in real time.

Claims24

Dependent claims

A sleep monitoring system comprising:

an interface for receiving sensor signals;
wherein the sensor signals include signals from both electrocardiogram and respiration sensors;
a processor for extracting a plurality of features from the sensor signals;
and
the processor is configured to operate as a classifier for generating an output indicating a sleep stage based upon classification of the plurality of extracted features, wherein at least one of the plurality of extracted features includes a measure of respiration and electrocardiogram derived respiratory (EDR) features, and
wherein the classifier uses a combination of the plurality of extracted features derived from frequency-domain and time-domain parameters of the electrocardiogram and respiration sensor signals to provide an estimate of the sleep stage based on probability distributions of the extracted features.

3 more elements

Dependencies are inferred from the claim text.

Sleep monitoring system

Life of this patent

Sleep monitoring system

Life of this patent

Abstract

Claims24