Sweat electrolyte loss monitoring devices
First Claim
1. A sweat sensing device configured to be worn on a skin surface of an individual, comprising:
- a first layer, comprising one or more ion selective electrode (ISE) sensors for measuring a concentration of an ion in a sweat sample, the one or more ISE sensors located in a sensor channel, the sensor channel comprising an inlet and an outlet, wherein the inlet is in fluidic communication with the skin surface, and the one or more ISE sensors are located between the inlet and the outlet; and
a second layer, comprising a water impermeable substrate and a reference electrode, the reference electrode comprising;
a reference chamber containing a mixture that includes a fumed silica matrix and a reference salt, and including a fill port at a first end of the reference chamber,a salt bridge chamber located at a second end of the reference chamber, the salt bridge chamber containing a mixture that includes a fumed silica matrix and a bridge salt, and including an exchange port configured to fluidically connect the reference electrode to the one or more ISE sensors, wherein the exchange port connects to the sensor channel at a location between the inlet and the one or more ISE sensors, anda wire electrode extending into the reference chamber from the fill port.
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Accused Products
Abstract
Embodiments of the disclosed invention provide devices and methods to incorporate suspension-based, i.e., hydrogel-based and thixotropic compound-based, ion-selective electrodes and reference electrodes into a wearable sweat sensing device. Embodiments of this device are configured to monitor sweat electrolyte concentrations, trends, and ratios under demanding use conditions. The accompanying method includes use of the disclosed device to track fluid and electrolyte gain and loss in order to produce an electrolyte estimate, such as a sweat electrolyte concentration, a sweat electrolyte concentration trend, a sweat rate, or a concentration ratio between a plurality of electrolytes.
130 Citations
15 Claims
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1. A sweat sensing device configured to be worn on a skin surface of an individual, comprising:
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a first layer, comprising one or more ion selective electrode (ISE) sensors for measuring a concentration of an ion in a sweat sample, the one or more ISE sensors located in a sensor channel, the sensor channel comprising an inlet and an outlet, wherein the inlet is in fluidic communication with the skin surface, and the one or more ISE sensors are located between the inlet and the outlet; and a second layer, comprising a water impermeable substrate and a reference electrode, the reference electrode comprising; a reference chamber containing a mixture that includes a fumed silica matrix and a reference salt, and including a fill port at a first end of the reference chamber, a salt bridge chamber located at a second end of the reference chamber, the salt bridge chamber containing a mixture that includes a fumed silica matrix and a bridge salt, and including an exchange port configured to fluidically connect the reference electrode to the one or more ISE sensors, wherein the exchange port connects to the sensor channel at a location between the inlet and the one or more ISE sensors, and a wire electrode extending into the reference chamber from the fill port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification