Method for measuring cardiovascular and respiratory parameters based on multi-wavelength photoplethysmography

US10542894B2 · kind B2 · utility

Assignee

• The Chinese University of Hong Kong · CN

Inventors

• Ni Zhao · Longbeilingcun, CN
• Yuanting Zhang
• Jing Liu · Tuji, CN
• Xiaorong Ding · Longdong, CN
• Wenxuan Dai · Zhejiang, CN
• Yao Li · Jinan, CN
• Shanshan Yuan · Riverview Drive, CN

Key dates

• Filing date: Dec 22, 2016
• Grant date: Jan 28, 2020
• Expiry date: Jan 22, 2038

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B2562/066
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Accurate and effective methods for measuring cardiovascular and respiratory parameters are provided. The method for deriving a depth-specific photoplethysmography (PPG) signal from multi-wavelength PPG signals includes choosing light wavelength combinations, calibrating a multi-layer light-tissue interaction model referring to a physiological signal, and generating the depth-specific PPG signal from the multi-wavelength PPG signals based on the calibrated light-tissue interaction model. The disclosed method for cuff-less blood pressure measurement includes recording a physiological signal and multi-wavelength PPG signals of a predetermined body part, deriving the depth-specific PPG signal reflecting the arterial blood volume with the physiological signal as a reference, calculating the pulse transit time (PTT) from the physiological signal and the derived arterial blood PPG signal, and calculating the blood pressure from the calibrated PTT and blood pressure relationship.