Patent ID: 9724027
Date: 2017-08-08
CPC Classifications: A61B,G01N,G02C

Claim:
1. An eye-mountable device, comprising: a transparent polymeric material having an eye-facing surface and an outward facing surface, wherein the transparent polymeric material is configured to be mounted in front of an eye surface, and wherein the transparent polymeric material includes a channel in the outward facing surface; a substrate at least partially embedded within the polymeric material; an antenna disposed on the substrate; a two-electrode electrochemical sensor disposed on a surface of the substrate and including: a controller electrically connected to the electrochemical sensor and the antenna, wherein the controller is configured to: (i) apply a voltage between the working electrode and the reference electrode sufficient to generate an amperometric current related to the concentration of an analyte in a fluid to which the eye-mountable device is exposed; (ii) measure the amperometric current; and (iii) use the antenna to indicate the measured amperometric current, wherein the working electrode and the reference electrode are both exposed by the channel to provide direct contact with the fluid.