Medical Design Briefs - July 2021 - 27

ing chip we could make, " says the study's
leader Ken Shepard, Lau Family professor
of electrical engineering and professor
of biomedical engineering. " This is a
new idea of 'chip as system' - this is a
chip that alone, with nothing else, is a
complete functioning electronic system.
This should be revolutionary for developing
wireless, miniaturized implantable
medical devices that can sense different
things, be used in clinical applications,
and eventually approved for
human use. "
Conformal copper layer
connects transducer
to input pad
50-nm gold layer
enhances connection
Microscale piezoelectric
transducer powers and
transmits data with IC
The team also included Elisa
Konofagou, the Robert and Margaret
Hariri Professor of Biomedical engineering
and professor of radiology, as well as
Stephen A. Lee, a PhD student in the
Konofagou lab who assisted in the animal
studies.
The design was done by doctoral student
Chen Shi, who is the first author of
the study. Shi's design is unique in its
volumetric efficiency, the amount of
function that is contained in a given
amount of volume. Traditional RF communications
links are not possible for a
device this small because the wavelength
of the electromagnetic wave is too large
Ground pad
Input pad
Anisotropic conductive
film (ACF) connects
transducer to ground pad
Temperature sensor
integrated circuit (IC)
Schematic representation of the device.
relative to the size of the device. Because
the wavelengths for ultrasound are
much smaller at a given frequency
because the speed of sound is so much
less than the speed of light, the team
used ultrasound to both power and communicate
with the device wirelessly.
They fabricated the " antenna " for communicating
and powering with ultrasound
directly on top of the chip.
The chip, which is the entire implant -
able/injectable mote with no additional
packaging, was fabricated at the Taiwan
Semiconductor Manufacturing Com -
Medical Design Briefs, July 2021
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Medical Design Briefs - July 2021

Table of Contents for the Digital Edition of Medical Design Briefs - July 2021

Medical Design Briefs - July 2021 - Intro
Medical Design Briefs - July 2021 - Cov4
Medical Design Briefs - July 2021 - Cov1
Medical Design Briefs - July 2021 - Cov2
Medical Design Briefs - July 2021 - 1
Medical Design Briefs - July 2021 - 2
Medical Design Briefs - July 2021 - 3
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Medical Design Briefs - July 2021 - Cov3
Medical Design Briefs - July 2021 - Cov4a
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