by Mat Dirjish

CEA-Leti and partner STMicroelectronics take a major step toward practical, continuous biochemical monitoring via their wearable patch prototype that analyzes sweat in real time. Pairing ST’s analog front-end R&D prototype project for solid-state electrochemical sensors with CEA-Leti’s sensing platform, the prototype collects sweat directly from the skin through an adhesive collection layer with an integrated microfluidic circuit.

Electrochemical pilot sensors in the device track indicators linked to hydration, fatigue, thermal stress, and exertion. After analysis, sweat evacuates through a microporous evaporation layer. All functional layers reside on flexible substrates thin enough to conform comfortably to the arm.

Called the Sweat Patch, the small device combines solid-state prototype sensors, a microfluidic network, and compact wireless electronics. Designed for extreme environmental conditions, it continuously measures three key physiological markers in its first version: pH, sodium, and potassium.

Developed under CEA-Leti’s “human-use-compliant by design” framework for health technologies, the prototype measures 3 cm in diameter and under 1 cm thick. All materials are medical-grade, non-toxic, and biocompatible.

Additionally, the Sweat Patch continuously tracks biochemical markers such as glucose, potassium, sodium, and lactate, providing real-time insights into hydration status, electrolyte balance, physical exertion, and stress levels. For further insights, visit the CEA-Leti and STMicroelectronics websites.

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