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Outdoor-Useable, Wireless/Battery-Free Patch-Type Tissue Oximeter with Radiative Cooling

Title
Outdoor-Useable, Wireless/Battery-Free Patch-Type Tissue Oximeter with Radiative Cooling
Authors
Kang, Min HyungLee, Gil JuLee, Joong HoonKim, Min SeokYan, ZhengJeong, Jae-WoongJang, Kyung-InSong, Young Min
DGIST Authors
Kang, Min Hyung; Lee, Gil Ju; Lee, Joong Hoon; Kim, Min Seok; Yan, Zheng; Jeong, Jae-Woong; Jang, Kyung-In; Song, Young Min
Issue Date
2021-05
Citation
Advanced Science, 8(10), 2004885
Type
Article
Author Keywords
daytime radiative coolingnonmetallic/flexible radiative cooleroutdoor useable oximeterthermal managementwearable optoelectronics
Keywords
OximetersPolymersRadiative CoolingSignal processingSolar energyTemperature controlTissueWearable technologyCooling performanceCooling structuresMaintaining temperaturesSignal acquisitionsSub-ambient coolingTissue oxygenationAbsorption coolingThermally protectedTissue oxygen saturation
ISSN
2198-3844
Abstract
For wearable electronics/optoelectronics, thermal management should be provided for accurate signal acquisition as well as thermal comfort. However, outdoor solar energy gain has restricted the efficiency of some wearable devices like oximeters. Herein, wireless/battery-free and thermally regulated patch-type tissue oximeter (PTO) with radiative cooling structures are presented, which can measure tissue oxygenation under sunlight in reliable manner and will benefit athlete training. To maximize the radiative cooling performance, a nano/microvoids polymer (NMVP) is introduced by combining two perforated polymers to both reduce sunlight absorption and maximize thermal radiation. The optimized NMVP exhibits sub-ambient cooling of 6 °C in daytime under various conditions such as scattered/overcast clouds, high humidity, and clear weather. The NMVP-integrated PTO enables maintaining temperature within ≈1 °C on the skin under sunlight relative to indoor measurement, whereas the normally used, black encapsulated PTO shows over 40 °C owing to solar absorption. The heated PTO exhibits an inaccurate tissue oxygen saturation (StO2) value of ≈67% compared with StO2 in a normal state (i.e., ≈80%). However, the thermally protected PTO presents reliable StO2 of ≈80%. This successful demonstration provides a feasible strategy of thermal management in wearable devices for outdoor applications. © 2021 The Authors. Advanced Science published by Wiley-VCH GmbH
URI
http://hdl.handle.net/20.500.11750/13762
DOI
10.1002/advs.202004885
Publisher
John Wiley and Sons Inc
Related Researcher
  • Author Jang, Kyung-In Bio-integrated Electronics Lab
  • Research Interests Extreme mechanics; Stand-alone electronics; Heterogeneous materials; Biocompatible interfaces
Files:
Collection:
Department of Robotics and Mechatronics EngineeringBio-integrated Electronics Lab1. Journal Articles


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