The streaming data from these biosensors can be used for health monitoring and diagnosis of neuro-degenerative conditions. A pair of earbuds can be turned into a tool to record the electrical activity of the brain as well as levels of lactate in the body with the addition of two flexible sensors
The screen-printed, flexible sensors are attached to the earbuds on a flexible, stamp-like surface. Credit: Erik Jepsen/University of California San Diego
The sensors, developed by a multidisciplinary research team of engineers at the University of California, San Diego, are a lot less cumbersome than state-of-the-art devices currently used to sense the brain’s electrical activity and the body’s sweat secretions. They can be used in the real world during exercise, the researchers showed.
“Being able to measure the dynamics of both brain cognitive activity and body metabolic state in one in-ear integrated device that doesn’t intrude on the comfort and mobility of the user opens up tremendous opportunities for advancing health and wellness of people of all ages, anytime and anywhere,” said Gert Cauwenberghs, a professor in the Shu Chien Gene Lay Department of Bioengineering at UC San Diego.
“One of the reasons why we were able to achieve this breakthrough was that we really thought about integration,” said Ernesto De La Paz, a Ph.D. alumnus from the research group of nanoengineering Professor Joseph Wang, and co-first author of the paper. “We wanted to make the sensors as small as possible to collect tiny sweat samples. We also accounted for the irregular shape of the ear by integrating components that can bend.
It is difficult to avoid crosstalk between the two sensors given the limited space inside the ear. Researchers analyzed various material selections, structural designs and validated the feasibility of simultaneously recording EEG and lactate signals with two sensors separated by two millimeters.
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