Wearable Patch That Powers Itself and Reads Sweat for 21 Days

A new skin‑attached device can keep working for three weeks without a battery, thanks to wireless power from a phone or wrist reader. The patch draws electricity from the nearby device’s magnetic field and uses it to refresh its sensor surface, so it stays accurate over time.

Technology: Developed by researchers at the University of California, Irvine; named IREM‑W2MS3.
Form factor: A flexible band that sticks to the skin and analyzes sweat in real time.
On‑Demand Sweat: Activates a hydrogel inside the patch when powered, making the wearer sweat without exercise or special equipment.
Analytes: Detects four key molecules—cortisol, glucose, lactate, and urea—to provide insights into stress levels, blood sugar, exercise intensity, and kidney health.
Robustness: Functions across varying temperatures, humidity levels, and pH values; tested for 21 days with no loss of signal quality.
Self‑Cleaning Surface: A low‑voltage pulse removes residue that would otherwise degrade performance, enabling long‑term accurate measurements.
Future Impact: Combining wireless power, surface regeneration, and multi‑marker detection could make continuous health monitoring practical for conditions such as diabetes or kidney disease.
Commercial Path: The team has filed a patent and is exploring market entry.

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