Open-Circuit Potential Glucose Sensing for Oxygen Compensation
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Solution Overview
Problem
Glucose sensors face inaccuracies due to variations in oxygen concentration in interstitial fluid, leading to fluctuations in glucose level measurements.
Innovation Solution
The glucose sensor utilizes an open circuit potential (OCP) signal, generated by a second working electrode, to account for changes in oxygen levels, thereby improving the accuracy of glucose level estimation by correcting sensor signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional glucose sensing methods are used, then glucose level can be measured, but measurement accuracy deteriorates due to oxygen concentration variations
Solution Approach 1:
The patent introduces an OCP signal as an intermediary parameter that mediates between the sensor current and glucose concentration. The OCP signal, measured under open-circuit conditions, serves as a proxy for oxygen concentration and is used to correct the amperometric glucose measurement, thereby eliminating the direct harmful effect of oxygen variations on measurement accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the OCP signal continuously monitors oxygen concentration changes and feeds this information back to correct the glucose measurement in real-time. The system dynamically adjusts the glucose reading based on the measured OCP signal, ensuring accurate measurements even when oxygen levels fluctuate
2Measurement precision
If a second working electrode is added to measure OCP signal, then oxygen level compensation is achieved, but device complexity increases
Solution Approach 1:
The patent makes the second working electrode multi-functional: it serves both as a glucose sensing electrode (when used with the counter electrode) and as an OCP measurement electrode (when used with the reference electrode). This universal approach allows oxygen compensation without requiring a completely separate sensing system, thereby limiting the increase in device complexity
Solution Approach 2:
The patent merges the glucose sensing function and oxygen monitoring function into a unified electrode system. The second working electrode is shared between both functions, and the system combines amperometric and open-circuit potential measurements into a single integrated measurement platform, reducing overall system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The OCP signal helps mitigate errors caused by oxygen fluctuations, enhancing the accuracy and longevity of glucose level measurements in continuous glucose monitors.
Implementation Method 1
The OCP signal may refer to a voltage between a working electrode and a reference electrode with little or no current flowing from the working electrode
Implementation Method 2
determine a sensor signal based on current flowing between the first working electrode and the counter electrode
Data Source
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AI summary
A device for determining a glucose level of a patient includes a set of electrodes comprising a first working electrode, a second working electrode, a counter electrode, and a reference electrode. The reference electrode is electrically coupled to the counter electrode. The device further includes a memory and one or more processors implemented in circuitry and in communication with the memory. The one or more processors configured to determine a sensor signal based on current flowing between the first working electrode and the counter electrode and determine an open circuit potential (OCP) signal based on a voltage across the second working electrode and the reference electrode. The one or more processors are further configured to determine the glucose level of the patient based on the sensor signal and the OCP signal and output an indication of the glucose level.