Medical Design Briefs - March 2022 - 29

Custom Finger Clip Offers
New Way to Measure Blood
Pressure, Other Vitals
The novel device uses two
MEDICAL
photoplethysmography (PPG) sensors.
University of Missouri
Columbia, MO
Monitoring a person's blood pressure on a regular basis can
help healthcare professionals with early detection of various
health problems such as high blood pressure, which has no
warning signs or symptoms. However, many things can alter an
accurate blood pressure reading, including a patient's nervousness
about having their blood pressure taken at a doctor's
office, otherwise known as white coat syndrome.
Now, researchers at the University of Missouri are customizing
a commercial finger clip device to provide a rapid, noninvasive
way for measuring and continually monitoring blood pressure.
The device can also simultaneously measure four additional vital
signs - heart rate, blood oxygen saturation, body temperature,
and respiratory rate, says Richard Byfield, a mechanical and aerospace
engineering graduate student in the MU College of
Engineering, and the lead author on the study.
" Typically, calculating someone's blood pressure at a hospital
or clinic involves using an inflatable cuff wrapped around
their arm, but there are three issues with that method - it can
cause damage to someone's arteries if done repeatedly within
a short amount of time; people's blood pressure can rise due
to nervousness; and it can take up to 30 seconds to complete, "
Byfield says. " Our device can record someone's blood pressure
within five seconds by using optical sensors placed on the
finger tip that measure the amount of light reflected off the
blood vessels underneath the surface of the skin. "
This process is called photoplethysmography (PPG), and the device
uses two PPG sensors located at two different points on a finger to
capture someone's pulse in order to calculate pulse wave velocity,
or how fast the blood is traveling through the bloodstream. Once
the data from the pulse wave velocity is gathered, it's transmitted
wirelessly to a computer for signal processing and blood pressure
calculation by a machine learning algorithm. The researchers say
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Researchers are customizing a commercial finger clip device to provide a
rapid, noninvasive way for measuring and continually monitoring blood
pressure. (Credit: University of Missouri)
Medical Design Briefs, March 2022
Cov
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Medical Design Briefs - March 2022

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