System and method for interference and motion detection from dark periods
AssigneeCovidien LP
InventorsChristopher Meehan, Robert Eikel, Daniel Lisogurski, Eric Morland
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Abstract
Systems and methods for interference and motion detection from dark periods are provided, including analysis of a physiological signal to determine a physiological parameter of a subject, using a photoplethysmography system to monitor signals during an LED-off period to identify interference or motion artifacts in the signal.
Claims16
A method of processing a physiological signal to determine a physiological parameter of a subject, the method comprising:
- receiving a signal using a photoplethysmography system, wherein the signal comprises a first component, attenuated by a subject, measured during an light-on period and a second component measured during a light-off period;
- performing a first analysis operation on the signal from said second component to identify interference or motion artifacts, wherein a DC portion of the light-off period is permitted to pass through during the first analysis operation and wherein said analysis operation assesses the percent modulation of the LED-off period;
- and
- determining the physiological parameter based on the signal.
A photoplethysmography system for processing a physiological signal to determine a physiological parameter of a subject, the system comprising:
- a photoplethysmography sensor configured to receive a signal attenuated by a subject, wherein the signal comprises a first component measured during a light-on period and a second component measured during a light-off period, wherein the photoplethysmography system comprises:
- a first dark period analysis module configured to perform an analysis operation on the signal from said second component to identify interference or motion artifacts, wherein a DC portion of the dark period is permitted to pass through during measurement during the light-off period and wherein said analysis operation assesses the percent modulation of the LED-off period;
- and
- a processor configured to determine the physiological parameter based on a filtered digital signal.
Dependencies are inferred from the claim text.