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A new reflective photoplethysmography (PPG) sensor module is developed with effort to optimize the distances between light emitting diodes (LEDs) and a photodiode (PD) in the proposed module for precision cuffless, non-invasive blood pressure (BP) measurement based on PPG of wrist artery. In the developed module, four LEDs with different wavelengths of 530 nm, 660 nm, 850 nm, 940 nm are included....
This study proposes a theoretical basis of blood flow volume sensor for arteriovenous fistula (AVF) of hemodialysis patients in a noninvasive way by means of reflectance-type photoplethysmography (PPG). After Bayesian neural network calibration, the PPG sensors based on the proposed mathematical equation shows high correlation to ultrasound Doppler blood flow meter (R2 = 0.7625) and the root mean...
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