Skin-interfaced microfluidic sweat collection devices for personalized hydration management through thermal feedback

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Microfluidics

Background:

• Wearable microfluidic devices offer valuable biochemical insights from sweat for hydration monitoring.
• Current devices often require active monitoring and are difficult to scale due to complex manufacturing.

Purpose of the Study:

• To develop a self-feedback microfluidic device for sweat analysis with an integrated dehydration reminder.
• To present a cost-effective "CAD-to-3D device" manufacturing approach for improved scalability.

Main Methods:

• The device integrates separate sweat collection and thermal feedback systems with serpentine microchannels, reservoirs, and bursting valves.
• A chemical exothermic reaction, triggered by sweat collection and valve rupture, activates thermal feedback.
• Human trials were conducted to validate the device's functionality and user feedback.

Main Results:

• The microfluidic device successfully collected sweat and provided a thermal sensation alert to users, indicating potential dehydration.
• The "CAD-to-3D device" approach demonstrated cost-effectiveness and facilitated scalable fabrication.
• The device effectively alerted users to hydration status through tactile thermal feedback.

Conclusions:

• The developed self-feedback microfluidic device offers a user-friendly and scalable solution for real-time hydration monitoring.
• The innovative dehydration reminder system enhances user experience by providing non-intrusive alerts.
• This technology shows significant potential for hydration management in sports and high-temperature environments.