Back to results
US 2014/0371558 A1Published application
Symmetrically Arranged Sensor Electrodes in an Ophthalmic Electrochemical Sensor
AssigneeGoogle Inc.
InventorsJames Etzkorn, Zenghe Liu
Life of this patent
Estimating the term…
Abstract
An eye-mountable device includes an electrochemical sensor embedded in a polymeric material configured for mounting to a surface of an eye. The electrochemical sensor includes a working electrode, a reference electrode, and a reagent that selectively reacts with an analyte to generate a sensor measurement related to a concentration of the analyte in a fluid to which the eye-mountable device is exposed. The working electrode can have a first side edge and a second side edge. The reference electrode can be 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.
Claims20
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.
8 more elements
A system comprising:
- an eye-mountable device including:
- a transparent 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;
- and
- a reader including:
- one or more antennas configured to:
- (i) transmit radio frequency radiation to power the eye-mountable device, and (ii) receive indications of the measured amperometric current via backscatter radiation received at the one or more antennas;
- and
- a processing system configured to determine a tear film analyte concentration value based on the backscatter radiation,
- 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.
15 more elements
A device comprising:
- a bio-compatible polymeric material;
- a substrate at least partially embedded within the bio-compatible 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.
8 more elements
Dependencies are inferred from the claim text.