University of California, Irvine researchers announced on May 13 the invention of a wearable, wireless, battery-free bioelectronic sensor designed to monitor users’ health by analyzing molecular biomarkers in human sweat. The device, named the In-Situ Regeneratable, Environmentally Stable, Multimodal, Wireless, Wearable Molecular Sweat Sensing System (IREM-W2MS3), is detailed in a study published in Nature Biomedical Engineering.
The development of this sensor matters because it addresses major challenges in long-term health monitoring. The IREM-W2MS3 offers continuous and stable measurement of key biomarkers associated with stress response, metabolic activity, physical exertion and kidney function. According to Rahim Esfandyar-pour, senior author and assistant professor of electrical engineering and computer science at UC Irvine: “The regenerative capability of the IREM-W2MS3 addresses one of the biggest obstacles in long-term wearable biosensing, which is sensor surfaces that lose performance after repeated measurements because molecules remain bound to the sensing layer.”
Worn as a flexible skin patch and paired with either an Android smartphone or a custom wrist-watch-like reader, the system can simultaneously track cortisol, glucose, lactate and urea levels in sweat. Esfandyar-pour said: “By being able to refresh itself, generate sweat and be worn for long durations outside of laboratory or clinical settings, the device offers users a health monitoring platform that is robust and highly practical.” He also said: “Chronic illnesses and stress-related conditions affect hundreds of millions of people worldwide, making early diagnosis and consistent health monitoring essential in reducing disease burden and improving patients’ quality of life.”
Unlike other sensors that degrade over time or struggle to measure multiple biomarkers accurately under varying environmental conditions, this device automatically applies a low voltage to its sensing surface during operation. This process restores sensitivity without manual cleaning or replacement. Testing showed nearly full recovery across multiple cycles over 21 days without signal degradation.
The patch operates without an internal battery by drawing power wirelessly from nearby devices using near field communication technology. It can also induce perspiration through activation of an embedded hydrogel when needed for analysis—eliminating the need for exercise before sampling.
Esfandyar-pour said: “Applications for the IREM-W2MS3 are numerous and varied. Potential uses include chronic disease management, stress and mental health monitoring, sports science and performance optimization; preventive medicine; early disease detection; and remote community health monitoring. We designed this wearable to be durable easy to use highly reliable.” The research team has submitted a patent application through UC Irvine’s Beall Applied Innovation office while continuing further development toward manufacturing.
Founded in 1965 as part of the University of California system,according to the official website, University of California Irvine participates in NCAA Division I athletics as the Anteaters; holds accreditation from the Western Association of Schools & Colleges Senior College & University Commission; earned Carnegie classification for very high research activity; focuses on advancing knowledge through research education public service with inclusive excellence; engages internationally via collaborations programs enhancing global influence.