Glucose Sensor Electrochemical Interference Detection
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Solution Overview
Problem
Continuous glucose monitoring (CGM) systems face electrochemical interference due to insulin excipients and other substances, leading to inaccurate glucose readings, which can result in improper insulin dosages and adverse effects for diabetic patients.
Innovation Solution
The implementation of electrochemical impedance spectroscopy (EIS) to monitor and detect electrochemical interference by measuring electrical impedances at various frequencies, determining charge transfer conductance and solution resistance, and outputting signals to indicate interference, thereby correcting sensor readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical impedance spectroscopy (EIS) is implemented to detect electrochemical interference, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the impedance measurement process into multiple frequency points (at least two different frequencies) to detect electrochemical interference. By measuring impedance at different frequencies and comparing the results, the system can identify interference conditions without requiring a single complex measurement technique, thus improving precision while managing device complexity through procedural segmentation.
2Reliability
If impedance measurements are taken at multiple frequencies to detect interference, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by performing impedance measurements at multiple frequencies before final glucose calculation. The system measures impedance at different frequencies, compares these preliminary measurements to detect interference, and only then proceeds with accurate glucose determination. This preliminary detection step ensures reliability by identifying interference conditions early, preventing wasted time on inaccurate measurements.
3Measurement precision
If electrochemical interference is detected and corrected, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using impedance measurement results to inform and adjust the glucose measurement process. The system measures impedance at multiple frequencies, uses these results to detect electrochemical interference, and then applies appropriate corrections or flags to the glucose reading based on the interference detection. This feedback loop improves precision by accounting for interference conditions while managing complexity through systematic processing rules.
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
This method effectively identifies and mitigates electrochemical interference, ensuring accurate glucose monitoring and reducing the risk of adverse effects by providing reliable glucose readings for diabetic patients.
Implementation Method 1
measuring, via the device, a plurality of impedances of the electrochemical cell corresponding to a plurality of frequencies; determining a charge transfer conductance and a solution resistance based on the plurality of impedances
Data Source
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AI summary
A method includes monitoring, via a device including an electrochemical cell, an electrical current that is proportional to an impedance of the electrochemical cell, and responsive to determining that the electrical current satisfies a threshold, measuring, via the device, a plurality of impedances of the electrochemical cell corresponding to a plurality of frequencies. The method further includes determining a charge transfer conductance and a solution resistance based on the plurality of impedances at fewer than four of the corresponding plurality of frequencies and determining the presence of electrochemical interference based on the solution resistance and the charge transfer conductance. The method further includes outputting an alert based on the determination of the presence of electrochemical interference.