Method and system for monitoring sleep
First Claim
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1. A method of monitoring sleep of a sleeping subject using output radiofrequency signals transmitted to the subject during sleep and input radiofrequency signals received from the subject during sleep, the method comprising:
- determining a phase shift of the input radiofrequency signals relative to the output radiofrequency signals to provide processed signals;
applying to said processed signals a dynamically variable filter characterized by a frequency band which is dynamically adapted in response to a change in a physiological condition of the subject;
using a cardiac output calculator, calculating cardiac output based on said filtered processed signals; and
using said cardiac output for identifying sleep apnea events.
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Abstract
A method of monitoring sleep of a sleeping subject is disclosed. The method comprises determining a phase shift of input radiofrequency signals received from the subject during sleep relative to output radiofrequency signals transmitted to the subject during sleep, calculating cardiac output based on the phase shift, and using the cardiac output for identifying sleep apnea events.
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Citations
26 Claims
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1. A method of monitoring sleep of a sleeping subject using output radiofrequency signals transmitted to the subject during sleep and input radiofrequency signals received from the subject during sleep, the method comprising:
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determining a phase shift of the input radiofrequency signals relative to the output radiofrequency signals to provide processed signals; applying to said processed signals a dynamically variable filter characterized by a frequency band which is dynamically adapted in response to a change in a physiological condition of the subject; using a cardiac output calculator, calculating cardiac output based on said filtered processed signals; and using said cardiac output for identifying sleep apnea events. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Apparatus for monitoring sleep of a sleeping subject using output radiofrequency signals transmitted to the subject during sleep and input radiofrequency signals received from the subject during sleep, the apparatus comprising:
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a phase shift determinator configured for determining a phase shift of the input radiofrequency signals relative to the output radiofrequency signals, to provide processed signals; a filtering unit configured for applying to said processed signals a dynamically variable filter characterized by a frequency band which is dynamically adapted in response to a change in a physiological condition of the subject; a cardiac output calculator configured for calculating cardiac output based on said filtered processed signals; and a sleep apnea identification unit configured for identifying sleep apnea events based on said cardiac output. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification