Health
Measure your blood pressure at your fingertips
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Soon you'll be able to measure your blood pressure at home using just your smartphone, thanks to an app called Vibro. Billion LabVibro is a spinoff company founded by electrical engineers from the University of California, San Diego. Designed by Edward Wang, assistant professor of electrical and computer engineering, and doctoral student Colin Barry, of the Jacobs School of Engineering and Design Lab, Vibro uses the phone's native camera, vibration motor, and motion sensors.
Unlike other devices currently on the market, Vibro does not require a separate blood pressure cuff. When a patient's finger is pressed against the vibrating phone screen, the pressure of the finger dampens the vibrations. The phone senses how much the vibration dampens and uses this value to calculate the amount of force being applied to the screen. The camera can see through the relatively thin tissue of the finger both the pulse and the point where blood flow is blocked by finger pressure. Oscillometric blood pressure is then determined using standard calculations based on the time that has passed since blood flow was blocked.
Competing solutions for measuring blood pressure in development use a method called pulse wave analysis, which is affected by factors such as body length, arterial stiffness and body position, making it an unreliable method despite incorporating calibration with a blood pressure cuff. “The literature is starting to show that pulse wave analysis of blood pressure is very unstable,” Wang says.
Development of the Vibro app has been supported by the National Institutes of Health (NIH) through multiple programs, including the third-year cohort of NIH MassAITC Pilot Award recipients (a $4.3 million initiative) and the NIH POCTRN program based on the CAPCaT mechanism. Billion Labs' pilot research at the University of California, San Diego was funded by Wang's Google Research Scholar Award fellowship.
The developers' dedication to user-centric design recently received a special mention in the Don Norman Design Awards. If you press too hard, blood flow will stop before your pulse is measured. If you press too lightly on the smartphone screen and blood flow stops, your blood pressure won't be measured. In addition, a steady pressure of several seconds is required to measure blood pressure.
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