Orthogonally Redundant Glucose Sensor System
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Solution Overview
Problem
Current glucose monitoring systems for diabetes management face challenges in accuracy, reliability, and user comfort due to the need for frequent calibration and susceptibility to environmental factors, particularly in closed-loop insulin-infusion systems where reliable data is crucial for automated insulin delivery.
Innovation Solution
An orthogonally redundant glucose monitoring system combining optical and electrochemical sensors, where each sensor type has unique interference profiles and failure modes, providing true redundancy and enhanced accuracy through weighted reliability calculations and predictive diagnostics, minimizing the need for external calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single glucose sensor is used, then the device complexity is low, but the reliability and accuracy are insufficient due to susceptibility to environmental factors and sensor drift
Solution Approach 1:
The patent combines multiple different types of glucose sensors (optical, electrochemical, magnetic, mechanical) into a single sensor system. Each sensor type operates through different measurement principles and is susceptible to different environmental factors, allowing them to compensate for each other's weaknesses and provide more reliable glucose monitoring data
2Measurement precision
If frequent calibration is performed, then the measurement precision is maintained, but the ease of operation deteriorates due to user burden and discomfort
Solution Approach 1:
The sensor system performs self-calibration by using multiple redundant sensors that automatically cross-validate their measurements. The system can detect and correct drift without user intervention by comparing readings from different sensor types, eliminating the need for frequent manual calibration procedures
Solution Approach 2:
The system continuously monitors glucose levels using multiple sensors and provides feedback to detect patterns of drift or interference. When anomalies are detected, the system can automatically adjust measurements or alert users, maintaining accuracy without requiring frequent manual calibration
3Reliability
If redundant sensors of the same type are used, then the reliability improves through backup capability, but the redundancy is insufficient because all sensors share the same interference profiles and failure modes
Solution Approach 1:
The patent employs a composite sensor system integrating multiple different sensing technologies (optical, electrochemical, magnetic, mechanical) rather than simply replicating the same sensor type. Each sensor technology has distinct interference profiles and failure modes, creating a more robust system where environmental factors affecting one sensor type do not simultaneously affect all sensors
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 system achieves improved accuracy and reliability, reducing the frequency of calibrations and enhancing user comfort by providing continuous, accurate glucose monitoring with reduced sensor drift and failure detection, thus supporting more effective closed-loop insulin delivery.
Implementation Method 1
an optical glucose sensor
Implementation Method 2
an optical glucose sensor
Implementation Method 3
a non-optical glucose sensor, which may be an electrochemical glucose sensor
Data Source
AI summary
A continuous glucose monitoring system may include a hand-held monitor, a transmitter, an insulin pump, and an orthogonally redundant glucose sensor, which may comprise an optical glucose sensor and a non-optical glucose sensor. The former may be a fiber optical sensor, including a competitive glucose binding affinity assay with a glucose analog and a fluorophore-labeled glucose receptor, which is interrogated by an optical interrogating system, e.g., a stacked planar integrated optical system. The non-optical sensor may be an electrochemical sensor having a plurality of electrodes distributed along the length thereof. Proximal portions of the optical and electrochemical sensors may be housed inside the transmitter and operationally coupled with instrumentation for, e.g., receiving signals from the sensors, converting to respective glucose values, and communicating the glucose values. The sensors' distal portions may be inserted into a user's body via a single delivery needle and may be co-located inside the user's body.