Photoplethysmogram System Patent, Multiple Light Sources
Summary
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.
What changed
The USPTO granted Patent US12605077B2 to PranaQ Pte. Ltd., conferring exclusive rights to a photoplethysmogram system and method employing at least three light sources of different frequencies. The patent covers the use of red, infrared, and green light sources in combination with a PPG sensor and processor capable of dynamic signal imputation based on consistency across light sources.
Medical device manufacturers developing photoplethysmography-based products should review this patent before product launches to assess potential infringement exposure. Competitors working with multi-wavelength PPG systems for physiological monitoring may need to evaluate whether licensing is required for similar signal-processing approaches.
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Apr 22, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Photoplethysmogram system and method
Grant US12605077B2 Kind: B2 Apr 21, 2026
Assignee
PRANAQ PTE. LTD.
Inventors
Cheng-Yao Chen, Uei-Ming Jow, Chih-Wei Hsu
Abstract
A photoplethysmogram system and method are disclosed. The system includes at least three light sources of different frequencies configured to emit light into a subject's skin. A PPG sensor detects the light from the multiple light sources after it has passed through the subject's skin and generates a PPG signal for each light source. A processor, communicatively coupled to the PPG sensor, receives the PPG signals and estimates physiological parameters from each PPG signal. The light sources may include a red light source, an infrared light source, and a green light source, with the green light source used for calibration in the measurement of blood oxygen saturation. The processor may dynamically perform amputation or imputation of the PPG signals based on the consistency of the signals from the different light sources. The physiological parameters may include respiratory effort and pulse rate and pulse rate variability.
CPC Classifications
A61B 5/0205 A61B 5/14552 A61B 5/02405 A61B 5/02416 A61B 5/08
Filing Date
2023-08-25
Application No.
18237898
Claims
12
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