Medical Design Briefs - June 2023 - 33
A biosensor
developed
by Huanyu
" Larry " Cheng,
the James
L.
Henderson,
Jr. Memorial Associate
Professor of Engineering Science and Mechanics, features superhydrophobic material that measures
sweat vapor without absorbing water. (Credit: Larry Cheng/Penn State)
and wound healing, as well as underlying
health statuses, such as pain or anxiety, "
Cheng says. " Skin-interfaced devices that
detect sweat rate and loss are currently
limited to working with sensible sweat
and are not suitable for insensible sweat
in a vapor state. "
Cheng developed a prototype of a
superhydrophobic sweat sensor to measure
vapor from insensible perspiration.
The material - a superabsorbent
hydrogel composite on a porous substrate
sandwiched between two superhydrophobic
textile layers - allows the
permeation of sweat vapor while preventing
the sensor from being affected
by the external water droplets of sensible
perspiration. The sensor could be
integrated with a flexible wireless communication
and powering module that
continuously monitors sweat rates at
different body locations.
" Proof-of-concept demonstrations
on human subjects showcased the feasibility
to continuously evaluate the
body's thermoregulation and skin barrier
functions, " Cheng says. " This enables
the assessment of thermal comfort,
disease conditions, and nervous
system activity and provides a low-cost
device platform to detect other
health-relevant biomarkers in the sweat
vapor as the next-generation sweat senMedical
Design Briefs, June 2023
sor for smart healthcare and personalized
medicine. "
Cheng's work was supported in part by
the National Institutes of Health, the National
Science Foundation, and Penn
State. The National
Natural
Science
Foundation of China, the Natural Science
Foundation of Hunan Province,
and the Furong Scholars of Hunan Province
program also provided support.
Co-authors include Shangda Chen,
Xiaofeng Li, Yujing Li, Weiyi Liu, Yangchengyi
Liu, Shun Qian, Yi Sun, Yao
A superabsorbent hydrogel composite on a porous
substrate
is
sandwiched
between
two
superhydrophobic
textile layers to allow the permeation
of sweat vapor while preventing the sensor
from being affected by the external water droplets
of sensible perspiration. (Credit: Larry
Cheng/Penn State)
Tian, Peihe Wang, Xiufeng Wang, Fengzhen
Yang, Hanlin Yang, and Ping
Zhang, all affiliated with Xiangtan University
in China.
This article was written by Mary Fetzer,
Penn State. For more information, contact
Larry Cheng, Penn State University,
Huanyu.Cheng@psu.edu or visit www.
psu.edu.
The integrated sensing device consists of the newly developed material attached to a flexible printed
circuit board and battery. (Credit: Larry Cheng/Penn State)
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Medical Design Briefs - June 2023
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