Detecting Four-Limb Blood Oxygen Saturation and Heart Rate based on Reflex Photoplethysmography

The study purpose is to construct a reflective Oxygen Saturation (SpO(2)) and Heart Rate (HR) four-limb detective device, improve transmission SpO(2) device only to measure finger, toe and earlobe. Using Silicon Labs Si1143, Arduino Nano, self-calibrated SpO(2) algorithm and mobile application software constitute a mobile reflective SpO(2) and HR detective device. Static four parts and post-exercise experiment had been carried out to test our device, the result can achieve comparable performance to a clinical device with no significant difference revealed by paired t-tests. This study has applied for clinical trial permission, the schedule will improve the calibration curve and compensation factor of unverifiable body parts by blood draw comparison. Provide clinical staff for immediate local SpO(2) and HR information, evaluate the effectiveness of vascular suture and hyperbaric oxygen therapy.