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Symmetrically Arranged Sensor Electrodes in an Ophthalmic Electrochemical Sensor

  • US 20140371558A1
  • Filed: 06/17/2013
  • Published: 12/18/2014
  • Est. Priority Date: 06/17/2013
  • Status: Active Grant
First Claim
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1. An eye-mountable device comprising:

  • a polymeric material having a concave surface and a convex surface, wherein the concave surface is configured to be removably mounted over a corneal surface and the convex surface is configured to be compatible with eyelid motion when the concave surface is so mounted;

    a substrate at least partially embedded within the polymeric material;

    an antenna disposed on the substrate;

    an electrochemical sensor disposed on the substrate and including (i) a working electrode having a first side edge and a second side edge, and (ii) a reference electrode situated such that at least a portion of the first and second side edges of the working electrode are adjacent respective sections of the reference electrode; and

    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 substrate is a ring-like structure having inner and outer edges,wherein the working electrode and the reference electrode each include a plurality of interdigitated extensions oriented on the substrate to be locally parallel to the inner and outer edges of the ring-like structure at one or more locations along the interdigitated extensions.

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