A contact-force regulated photoplethysmography (PPG) platform

• Published in: AIP advances Vol. 8; no. 4; pp. 045210 - 045210-7
• Main Authors: Sim, Jai Kyoung, Ahn, Bongyoung, Doh, Il
• Format: Journal Article
• Language: English
• Published: AIP Publishing LLC 01-04-2018
• ISSN: 2158-3226; 2158-3226
• DOI: 10.1063/1.5020914

A photoplethysmography (PPG) platform integrated with a miniaturized force-regulator is proposed in this study. Because a thermo-pneumatic type regulator maintains a consistent contact-force between the PPG probe and the measuring site, a consistent and stable PPG signal can be obtained. We designed and fabricated a watch-type PPG platform with an overall size of 35 mm × 19 mm. In the PPG measurement on the radial artery wrist while posture of the wrist is changed to extension, neutral, or flexion, regulation of the contact-force provides consistent PPG measurements for which the variations in the PPG amplitude (PPGA) was 7.2 %. The proposed PPG platform can be applied to biosignal measurements in various fields such as PPG-based ANS monitoring to estimate nociception, sleep apnea syndrome, and psychological stress.