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Photoplethysmogram System Patent, Multiple Light Sources

The USPTO granted Patent US12605077B2 to PranaQ Pte. Ltd. for a photoplethysmogram (PPG) system using multiple light sources of different frequencies (red, infrared, green). The system includes a PPG sensor that detects light after passage through a subject's skin and a processor that estimates physiological parameters including blood oxygen saturation, respiratory effort, pulse rate, and pulse rate variability. The patent contains 12 claims and covers dynamic signal processing methods including calibration using a green light source and imputation of inconsistent PPG signals.