Non-invasive blood pressure estimation and blood vessel monitoring based on photoacoustic plethysmography

• Main Authors: STOIANOV, ALEXEI, KITCHENS, JACK CONWAY, GOJEVIC, STEPHEN MICHAEL, BROOKS, EMILY KATHRYN, JOHN ARCHIBALD, FITZGERALD, GORE, SHOUNAK UDAY, BUCHAN, NICHOLAS IAN, SCHNEIDER, JOHN KEITH, BRELOFF, EVAN MICHAEL
• Format: Patent
• Language: Chinese; English
• Published: 01.10.2022
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

Some disclosed methods involve controlling, via a control system, a light source system to emit a plurality of light pulses into biological tissue at a pulse repetition frequency, the biological tissue including blood and blood vessels at depths within the biological tissue. Such methods may involve receiving, by the control system, signals from the piezoelectric receiver corresponding to acoustic waves emitted from portions of the biological tissue, the acoustic waves corresponding to photoacoustic emissions from the blood and the blood vessels caused by the plurality of light pulses. Such methods may involve detecting, by the control system, heart rate waveforms in the signals, determining, by the control system, a first subset of detected heart rate waveforms corresponding to vein heart rate waveforms and determining, by the control system, a second subset of detected heart rate waveforms corresponding to artery heart rate waveforms.