Methods and Systems for Monitoring Cardiorespiratory Function Using Photoplethysmography
AssigneeXhale, Inc.
InventorMichael Stahl
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Abstract
Provided according to embodiments of the invention are methods, devices and systems for monitoring respiration. Methods described herein include isolating an isolated DC component signal stream, and optionally an isolated AC component signal stream, from the raw PPG signal; calculating a waveform parameter using at least a portion of the isolated DC component signal stream, and optionally, a corresponding portion of the raw PPG signal stream and/or the isolated AC component signal stream; and monitoring respiration in the individual by analyzing the waveform parameter over time.
Claims18
1-20. (canceled)
A microprocessing device configured to isolate an AC component signal stream, the DC component signal stream, or both, from a raw PPG signal obtained from an individual;
- calculate one or more waveform parameters from the DC component signal stream and optionally the AC component signal stream and/or the raw PPG signal stream to produce at least one waveform parameter data stream;
- determine whether a respiratory event has occurred in the individual by analyzing the at least one waveform parameter data stream;
- wherein the at least one waveform parameter comprises at least one of Peak Height, Trough Depth, additive AC Peak-to-Peak, subtractive AC Peak-to-Peak, Top Area, Bottom Area, Peak Rise Time, Rise Time Ratio, Trough Fall Time, Fall Time Ratio, Time Ratio, Peak Trough Ratio, Area Ratio, DC swing, DC variance, and the DC area.
The device of claim 1, wherein the at least one waveform parameter is calculated from both a PPG signal stream obtained from light emitted in an IR wavelength and from a PPG signal stream obtained from light emitted at a red wavelength.
Dependencies are inferred from the claim text.