Tech Briefs Magazine - June 2022 - 44

Health & Biotech
Bandage Material Stops Bleeding Without Adhering to
the Wound
The bandage repels blood and aids the clotting process.
ETH Zurich, Switzerland, and National University of Singapore
R
esearchers have developed a new kind
of bandage that helps blood to clot and
doesn't stick to the wound. They tested various
superhydrophobic materials - which
are, like Teflon, extremely good at repelling
liquids such as water and blood. The goal
was to find coatings for devices that come
into contact with blood; for example, heartlung
machines or artificial heart devices.
One of the materials not only repelled
blood but also aided the clotting process.
Although this made the material unsuitable
for use as a coating for blood pumps
and related devices, it was ideally suited
for a bandage.
Repelling blood and achieving fast clotting
are two different properties that are
both beneficial in bandages: blood-repellent
bandages do not get soaked with blood
and do not adhere to the wound, so they
can be removed easily, which avoids secondary
bleeding. Sub stances and materials that
promote clotting, on the other hand, are
used in medicine to stop bleeding as quickly
as possible; however, to date, no materials
that simultaneously repel blood and also
promote clotting have been available.
The researchers took a conventional cotton
gauze and coated it with the new material
- a mix of silicone and carbon nanofibers.
They were able to show in laboratory
tests that blood in contact with the coated
gauze clotted in only a few minutes. Exactly
why the new material triggers blood clotting
is still unclear and requires further research
but the team suspects that it is due to
the interaction with the carbon nanofibers.
They were also able to show that the coated
gauze has an antibacterial effect, as bacteria
have trouble adhering to its surface.
With the superhydrophobic material,
the wound does not reopen when the bandage
is changed. Reopening wounds increases
the risk of infection including from
dangerous hospital germs - a risk that is
especially high when changing bandages.
For more information, contact Dr. Fabio
Bergamin at fabio.bergamin@hk.ethz.ch;
+41 44 632 57 80.
44
The bandage coated with silicone and carbon nanofibers promotes healing and can subsequently
be easliy removed. (Image: Li Z et al. Nature Communications 2019)
Regular gauze
Coated gauze
(Left) Regular cotton gauze that absorbs blood. (Right) Gauze coated with carbon nanofibers in
silicon. (Bottom) Close-ups of the cotton fibers under an electron microscope. (Image: Li Z et al.
Nature Communications 2019)
www.techbriefs.com
Tech Briefs, June 2022
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Cov
ToC
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Tech Briefs Magazine - June 2022

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Tech Briefs Magazine - June 2022 - Intro
Tech Briefs Magazine - June 2022 - Sponsor
Tech Briefs Magazine - June 2022 - Band1
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Tech Briefs Magazine - June 2022 - Cov2
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