Patent ID: 9572522
Date: 2017-02-21
CPC Classifications: A61B

Claim:
1. An eye-mountable device comprising: a transparent polymeric material; a substrate at least partially embedded within the polymeric material; an antenna disposed on the substrate; a conductivity sensor disposed on the substrate, wherein the conductivity sensor includes: a frame having a trench formed therein that defines a fluid sample cell, wherein the trench includes a first sidewall and a second sidewall, a first electrode formed on the first sidewall, and a second electrode formed on the second sidewall such that the first and second electrodes are on opposite sides of the fluid sample cell; and a controller electrically connected to the sensor electrodes and the antenna, wherein the controller is configured to: (i) apply a voltage to the electrodes sufficient to generate a current through the electrodes related to a conductance of a fluid occupying the fluid sample cell; (ii) measure the generated current; and (iii) use the antenna to indicate the measured current.