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Sweat conductivity, volumetric sweat rate, and galvanic skin response devices and applications

  • US 10,405,794 B2
  • Filed: 07/18/2017
  • Issued: 09/10/2019
  • Est. Priority Date: 07/19/2016
  • Status: Active Grant
First Claim
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1. A sweat sensing device configured to be worn on an individual'"'"'s skin, comprising:

  • a sweat collector, comprising a concave surface facing the skin, a substantially circular seal, and a fluid port, wherein the concave surface creates a clearance from the skin to promote natural flow of sweat, wherein the seal interacts with the skin to create a coverage area within the collector that is determined, and wherein the seal is configured to substantially prevent sweat from exiting the coverage area from skin located inside the coverage area, and to substantially prevent sweat and surface contaminants from entering the coverage area from skin located outside the coverage area, and wherein the fluid port is in fluidic communication with the microfluidic channel inlet;

    a microfluidic channel for receiving and transporting a sweat sample, wherein the channel has an inlet at a first end, an outlet at a second end, and has a known volume;

    a plurality of GSR electrodes for measuring galvanic skin response (“

    GSR”

    ), wherein said GSR electrodes are configured to contact the individual'"'"'s skin when the device is being worn, and wherein the GSR electrodes are located outside the seal of the sweat collector;

    a plurality of conductivity electrodes for measuring sweat conductivity, wherein said conductivity electrodes are in fluid communication with said channel, and wherein the conductivity electrodes are located proximate to the first end of the channel; and

    a volumetric sweat rate sensor, wherein the volumetric sensor includes a detection circuit that includes a plurality of sweat rate electrodes, wherein said sweat rate electrodes intersect said channel at known intervals, where said sweat rate electrodes are in fluid communication with the channel, wherein said sweat rate electrodes divide the channel into a plurality of channel sections, and wherein a plurality of primary sweat rate electrodes located proximate to the channel'"'"'s first end are separated by a first interval, and a plurality of secondary sweat rate electrodes located proximate to the channel'"'"'s second end are separated by a second interval, and wherein the second interval is greater than the first interval.

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