Sweat sensing devices with electromagnetically shielded sensors, interconnects, and electronics
A technology of electromagnetic shielding and electronic devices, applied in the direction of sensors, biological testing, diagnostic recording/measurement, etc.
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[0046] Our calculations aim to reduce the fluid volume between the eccrine sweat duct and the sensor from 1 μL to 10 nL (10–100X), resulting in chronologically correlated sweat biosensing with a maximum resolution of ~2 min. Aspects of the disclosed invention include eliminating greater than 90% of the dead volume adjacent to the epidermal surface, mitigating surface contamination, and resulting in ultra-efficient transport of sweat across sub-mm electrochemical biosensor arrays. Ultra-efficient sweat sampling and delivery is critical for applications that require minute-level resolution, and even for those that do not, can greatly reduce the burden of sweat volume required to obtain viable samples. It should be recognized that the calculations below do not take into account certain effects such as surface non-uniformity and sweat contact angle hysteresis.
[0047] In all calculations here, the wicking pressures P1, P2, P3 are derived from the negative Laplace pressure The su...
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