Dual Electrode Continuous Glucose Sensor Calibration
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Solution Overview
Problem
Conventional continuous glucose sensors require frequent recalibration due to sensitivity changes over time, caused by metabolic changes, tissue maturation, and interfering species, leading to inaccurate glucose measurements and increased discomfort for diabetic patients.
Innovation Solution
The development of improved calibration techniques using electrode systems and signal processing that measure glucose-related and non-glucose related signals to determine sensitivity changes, allowing for reduced reference glucose values and increased accuracy, including the use of a glucose-measuring electrode and a transport-measuring electrode to calculate a glucose-to-oxygen ratio for stability assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous glucose sensors are used to provide continuous monitoring, then the ability to track glucose trends is improved, but sensitivity changes over time require frequent recalibration
Solution Approach 1:
The patent implements a feedback mechanism where the sensor system continuously monitors its own sensitivity changes by comparing sensor output signals with reference glucose measurements. This feedback loop enables automatic detection of sensitivity drift and triggers recalibration when needed, maintaining measurement precision while preserving continuous monitoring capability.
Solution Approach 2:
The patent performs preliminary calibration actions by establishing an initial sensitivity relationship between sensor output and glucose concentration. This preliminary calibration creates a baseline that the system uses to detect future sensitivity changes, allowing the system to proactively identify when recalibration is needed rather than waiting for accuracy degradation.
2Measurement precision
If frequent recalibration is performed to maintain accuracy, then measurement precision is improved, but user convenience deteriorates due to increased discomfort
Solution Approach 1:
The patent enables the sensor system to perform self-calibration by automatically detecting sensitivity changes through its own output signals and comparing them with stored reference data. This self-service capability eliminates the need for frequent manual recalibration by the user, maintaining measurement precision while preserving convenience. The system serves itself by identifying when calibration is needed and executing the necessary adjustments.
3Measurement precision
If multiple blood glucose measurements are required for calibration, then sensor accuracy is improved, but the complexity of the calibration process increases
Solution Approach 1:
The patent merges the calibration process with routine glucose monitoring by using the same sensor output signals for both purposes. Instead of requiring separate calibration procedures with multiple blood glucose measurements, the system combines calibration data collection with normal operational data, reducing the number of additional measurements needed and simplifying the overall process.
Solution Approach 2:
The patent makes the sensor system multi-functional by enabling it to perform both continuous glucose monitoring and self-calibration using the same hardware and data streams. The sensor output serves dual purposes: providing glucose concentration information and detecting sensitivity changes for calibration, thereby reducing the need for separate calibration procedures and simplifying the user experience.
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 approach simplifies and enhances calibration, providing more accurate and stable glucose measurements with fewer user interventions, thereby improving patient convenience and confidence in glucose monitoring.
Implementation Method 1
measuring a first signal in the host by obtaining at least one glucose-related sensor data point, wherein the first signal is measured at a glucose-measuring electrode disposed beneath an enzymatic portion of a membrane system on the sensor
Implementation Method 2
measuring a second signal in the host by obtaining at least one non-glucose constant data point, wherein the second signal is measured beneath the inactive or non-enzymatic portion of the membrane system on the sensor
Implementation Method 3
continuous glucose sensors are conventionally also sensitive to non-glucose related changes in the baseline current and sensitivity over time, for example, due to changes in a host's metabolism, maturation of the tissue at the biointerface of the sensor
Data Source
AI summary
Disclosed herein are systems and methods for a continuous analyte sensor, such as a continuous glucose sensor. One such system utilizes first and second working electrodes to measure additional analyte or non-analyte related signal. Such measurements may provide a background and/or sensitivity measurement(s) for use in processing sensor data and may be used to trigger events such as digital filtering of data or suspending display of data.