Standby Biasing Of Electrochemical Sensor To Reduce Sensor Stabilization Time During Measurement
First Claim
1. A method comprising:
- applying a stabilization voltage between a working electrode and a reference electrode in an eye-mountable device, wherein the stabilization voltage is sufficient to cause an analyte to undergo an electrochemical reaction at the working electrode;
while the stabilization voltage is being applied, wirelessly receiving a measurement signal at an antenna in the eye-mountable device;
responsive to receiving the measurement signal, activating measurement electronics in the eye-mountable device to transition the measurement electronics from a standby mode to an active mode, wherein the measurement electronics consume more power in the active mode than in the standby mode; and
during the active mode, operating the measurement electronics to (i) measure an amperometric current through the working electrode, wherein the amperometric current is related to the analyte, and (ii) wirelessly communicate the measured amperometric current via the antenna.
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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 applies a stabilization voltage between a working electrode and a reference electrode to allow the amperometric current to stabilize before powering measurement electronics configured to measure the amperometric current and communicate the measured amperometric current. The electrochemical sensor consumes less power while applying the stabilization voltage than during the measurement. The measurement is initiated in response to receiving a measurement signal at an antenna in the eye-mountable device.
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Citations
23 Claims
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1. A method comprising:
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applying a stabilization voltage between a working electrode and a reference electrode in an eye-mountable device, wherein the stabilization voltage is sufficient to cause an analyte to undergo an electrochemical reaction at the working electrode; while the stabilization voltage is being applied, wirelessly receiving a measurement signal at an antenna in the eye-mountable device; responsive to receiving the measurement signal, activating measurement electronics in the eye-mountable device to transition the measurement electronics from a standby mode to an active mode, wherein the measurement electronics consume more power in the active mode than in the standby mode; and during the active mode, operating the measurement electronics to (i) measure an amperometric current through the working electrode, wherein the amperometric current is related to the analyte, and (ii) wirelessly communicate the measured amperometric current via the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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during a stabilization period, wirelessly transmitting, by a reader, a stabilization signal to an eye-mountable device comprising a working electrode, stabilization electronics, measurement electronics, and an antenna, wherein the stabilization signal is configured to cause the stabilization electronics to apply a stabilization voltage between the working electrode and the reference electrode, wherein the stabilization voltage is sufficient to cause an analyte to undergo an electrochemical reaction at the working electrode; during a measurement period following the stabilization period, wirelessly transmitting, by the reader, a measurement signal to the eye-mountable device, wherein the measurement signal is configured to (i) cause the measurement electronics to measure an amperometric current through the working electrode, wherein the amperometric current is related to the analyte, (ii) cause the measurement electronics to wirelessly communicate the measured amperometric current via the antenna, and (iii) supply power for powering the measurement electronics; and receiving, by the reader, an indication of the measured amperometric current wirelessly communicated from the eye-mountable device. - View Dependent Claims (14, 15, 16, 17)
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18. An eye-mountable device comprising:
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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; an antenna; an electrochemical sensor that includes a working electrode and a reference electrode; stabilization electronics operable to apply a stabilization voltage between the working electrode and the reference electrode, wherein the stabilization voltage is sufficient to cause an analyte to undergo an electrochemical reaction at the working electrode; measurement electronics, wherein the measurement electronics, when activated, are configured to;
(i) apply a measurement voltage between the working electrode and the reference electrode, (ii) measure an amperometric current through the working electrode, wherein the amperometric current is related to the analyte, and (iii) use the antenna to communicate the measured amperometric current; anda controller, wherein the controller is configured to operate the stabilization electronics to apply the stabilization voltage during a stabilization period and to activate the measurement electronics during a measurement period in response to receiving a measurement signal via the antenna. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification