Tech Briefs Magazine - July 2021 - 47

sound waves mildly interfere with the
original chirp, creating a broad, shallow
dip in the overall signal. But when the
eardrum has fluid behind it, it doesn't
vibrate as well and reflects the original
sound waves back. They interfere more
strongly with the original chirp and create
a narrow, deep dip in the signal.
Researchers tested the algorithm on a
variety of smartphones and used different
types of paper to make the funnel.
The results were consistent regardless of
phone or paper type.
For more information, contact Sarah
McQuate at smcquate@uw.edu; 206-543-2580.
Electronic Tattoo Enables Uninterrupted Heart Monitoring
for Extended Periods
This wearable device is placed on the skin to measure a variety of body responses, from
electrical to biomechanical signals.
University of Texas, Austin
wearable technology made
from stretchy, lightweight
material could make heart health
monitoring easier and more
accurate than existing electrocardiograph
machines - a technology
that has changed little in
almost a century.
A
The electronic tattoo (e-tattoo)
technology is graphene-based
and is placed on the skin to measure
a variety of body responses,
from electrical to biomechanical
signals. The device is so lightweight
and stretchable that it can
be placed over the heart for ex -
tended periods with little or no
discomfort. It also measures cardiac
health in two ways, taking electrocardiograph
(ECG) and seismocar dio -
graph (SCG) readings simultaneously.
ECG records the rates of electrical activity
produced each time the heart beats;
SCG is a measurement technique using
chest vibrations associated with heartbeats.
Powered remotely by a smart -
phone, the e-tattoo is the first ultrathin
The e-tattoo is made from stretchy, lightweight material that can
be placed over the heart for extended periods.
and stretchable technology to measure
both ECG and SCG.
ECG readings alone are not accurate
enough for determining heart health
but they provide additional information
when combined with SCG signal
recordings. Like a form of quality control,
the SCG indicates the accuracy of
the ECG readings.
Antibacterial Gel Bandage Using Yeast
The gel works even at freezing temperatures and contains natural antimicrobial compounds
derived from durian husk.
Nanyang Technological University, Singapore
S
cientists have made an antibacterial
gel bandage using the discarded
husks of durian, a tropical fruit. Durian
has a thick husk with spiky thorns that is
discarded, while the sweet flesh surrounding
the seeds on the inside is considered
a delicacy.
By extracting high-quality cellulose
from the durian husks and combining it
with glycerol - a waste byproduct from
Tech Briefs, July 2021
Cov
the biodiesel and soap industry - the
scientists created a soft gel, similar to silicon
sheets, that can be cut into band -
ages of various shapes and sizes. They
then added the organic molecules produced
from baker's yeast known as natural
yeast phenolics, making the bandage
deadly to bacteria.
Conventional hydrogel patches are
commonly available at pharmacies, usuwww.techbriefs.com
ToC
ally
used to cover wounds from surgery
to minimize the formation of excessive
scar tissue, resulting in a softer and flatter
scar. The patch keeps the skin hydrated
instead of drying up when conventional
gauze bandages are used.
The conventional hydrogel patches
are made from synthetic materials such
as polymers like polymethacrylate and
polyvinylpyrrolidine. Those with antimi47
Although
soft e-tattoos for ECG
sensing are not new, other sensors
such as the SCG sensor are still
made from non-stretchable materials,
making them bulky and
uncomfortable to wear. The e-tattoo
is made of a piezoelectric
polymer called polyvinylidene fluoride
that is capable of generating
its own electric charge in response
to mechanical stress. The device
also includes 3D digital image correlation
technology that is used to
map chest vibrations in order to
identify the best location on the
chest to place the e-tattoo.
Usually, an ECG measurement
re quires going to a doctor's office
where heart health can be monitored only
for a couple of minutes at a time. This
device can be worn for days, providing
constant heart monitoring. A smartphone
app stores the data safely and shows a
heart beating on the screen in real time.
For more information, contact John
Holden at john.holden@utexas.edu; 512529-6013.
http://www.techbriefs.com http://www.abpi.net/ntbpdfclicks/l.php?202107TBNAV

Tech Briefs Magazine - July 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - July 2021

Tech Briefs Magazine - July 2021 - Intro
Tech Briefs Magazine - July 2021 - Sponsor
Tech Briefs Magazine - July 2021 - Cov1
Tech Briefs Magazine - July 2021 - Cov2
Tech Briefs Magazine - July 2021 - 1
Tech Briefs Magazine - July 2021 - 2
Tech Briefs Magazine - July 2021 - 3
Tech Briefs Magazine - July 2021 - 4
Tech Briefs Magazine - July 2021 - 5
Tech Briefs Magazine - July 2021 - 6
Tech Briefs Magazine - July 2021 - 7
Tech Briefs Magazine - July 2021 - 8
Tech Briefs Magazine - July 2021 - 9
Tech Briefs Magazine - July 2021 - 10
Tech Briefs Magazine - July 2021 - 11
Tech Briefs Magazine - July 2021 - 12
Tech Briefs Magazine - July 2021 - 13
Tech Briefs Magazine - July 2021 - 14
Tech Briefs Magazine - July 2021 - 15
Tech Briefs Magazine - July 2021 - 16
Tech Briefs Magazine - July 2021 - 17
Tech Briefs Magazine - July 2021 - 18
Tech Briefs Magazine - July 2021 - 19
Tech Briefs Magazine - July 2021 - 20
Tech Briefs Magazine - July 2021 - 21
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Tech Briefs Magazine - July 2021 - 46
Tech Briefs Magazine - July 2021 - 47
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Tech Briefs Magazine - July 2021 - 56
Tech Briefs Magazine - July 2021 - Cov3
Tech Briefs Magazine - July 2021 - Cov4
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