Nonlinear Mapping for Calibration-Free Glucose Sensors
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Solution Overview
Problem
Current continuous glucose monitoring systems require frequent calibration using finger stick measurements, which is inconvenient and unreliable, as the sensor output current (Isig) is not analyte-independent and cannot predict continued sensor performance.
Innovation Solution
A calibration-free blood glucose sensor system that applies a constant voltage potential to generate a constant potential sensor current, performs electrochemical impedance spectroscopy, and uses nonlinear mapping operations on the sensor current and impedance measurements to generate accurate glucose values without the need for calibration factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear sensor output methods are used, then the sensor structure remains simple, but the sensor requires frequent calibration and cannot provide reliable continuous monitoring
Solution Approach 1:
The patent transforms the sensor output from linear current (Isig) to nonlinear parameters including impedance magnitude and phase angle across multiple frequencies. This parameter transformation enables analyte-independent diagnostics and calibration-free operation, resolving the contradiction between reliability and complexity by changing the mathematical domain of sensor outputs rather than adding physical components
Solution Approach 2:
The patent introduces impedance spectroscopy as an intermediary measurement that provides analyte-independent information about sensor health. This intermediary parameter acts as a mediator between the raw sensor current and the final glucose concentration, enabling reliable monitoring without direct calibration while maintaining system feasibility through software-based processing
2Measurement precision
If calibration factors are applied to improve measurement accuracy, then glucose measurement precision improves, but the need for frequent finger stick measurements increases
Solution Approach 1:
The patent enables the sensor system to self-calibrate by using impedance spectroscopy measurements to automatically detect and compensate for sensor degradation, manufacturing variations, and drift over time. The system performs self-diagnosis through analyte-independent impedance parameters, eliminating the need for external calibration references and reducing calibration time to near zero
Solution Approach 2:
The patent implements continuous feedback through impedance spectroscopy measurements that monitor sensor health in real-time. This feedback mechanism allows the system to detect changes in sensor characteristics and adjust measurements accordingly, maintaining precision without requiring periodic manual calibration interventions
3Adaptability or versatility
If the sensor output current (Isig) is used directly for monitoring, then the measurement process remains simple, but the sensor cannot provide analyte-independent diagnostics
Solution Approach 1:
The patent adds a new dimension to sensor measurements by incorporating impedance spectroscopy across multiple frequencies rather than relying solely on DC current. This dimensional expansion from scalar current to complex frequency-domain impedance provides analyte-independent information while the nonlinear mapping algorithms process this extended data space to deliver enhanced diagnostics and calibration-free operation
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
Enables reliable, continuous glucose monitoring without the need for frequent calibration, automatically compensating for manufacturing tolerances and sensor aging, providing accurate blood glucose values independently of linear translation.
Implementation Method 1
performing an electrochemical impedance spectroscopy (EIS) procedure for the glucose sensor to obtain EIS output measurements
Implementation Method 2
The EIS output measurements are obtained in response to application of alternating current (AC) voltage signals to the glucose sensor
Data Source
AI summary
A method of measuring blood glucose of a patient is presented here. In accordance with certain embodiments, the method applies a constant voltage potential to a glucose sensor and obtains a constant potential sensor current from the glucose sensor, wherein the constant potential sensor current is generated in response to applying the constant voltage potential to the glucose sensor. The method continues by performing an electrochemical impedance spectroscopy (EIS) procedure for the glucose sensor to obtain EIS output measurements. The method also performs a nonlinear mapping operation on the constant potential sensor current and the EIS output measurements to generate a blood glucose value.