Standby Biasing Of Electrochemical Sensor To Reduce Sensor Stabilization Time During Measurement

摘要

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.

主权项

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.