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Soft Wearable Pressure Sensors for Beat‐to‐Beat Blood Pressure Monitoring
Author(s) -
Kim Joshua,
Chou EnFan,
Le Jamie,
Wong Sabrina,
Chu Michael,
Khine Michelle
Publication year - 2019
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.201900109
Subject(s) - materials science , elastomer , capacitive sensing , beat (acoustics) , pressure sensor , electrode , acoustics , pressure measurement , biomedical engineering , optoelectronics , composite material , electrical engineering , mechanical engineering , engineering , physics , quantum mechanics
Wrinkled gold thin films on elastomeric substrates are used as robust parallel plate electrodes for soft capacitive pressure sensors. The wrinkled structures create a robust integration with the polymer, allowing repeated normal force to deform the thin film without failure. By incorporating microridged structures that support the counter electrodes to create air cavities within the elastomeric dielectric layer, pressure sensitivity is further increased to 0.148 kPa −1 over a wide dynamic range of up to 10 kPa. The wide dynamic range and pressure sensitivity of the pressure sensor allow for consistent measurements of the pressure exerted by the radial artery located on the wrist. The soft capacitive pressure sensor displays comparable results when tested against an FDA approved device (Clearsight, Edwards Lifesciences, Irvine, CA) measuring beat‐to‐beat blood pressure. These soft pressure sensors using wrinkled thin films, therefore, illustrate considerable potential to continuously monitor beat‐to‐beat blood pressure.