Sensor Hydration Detection Circuit for Glucose Monitoring
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Solution Overview
Problem
Current continuous glucose measurement systems require a significant stabilization time before providing accurate readings, often inconvenient for patients and prone to inaccurate initial readings due to non-hydrated electrodes, with no automatic procedure to determine when sensors are ready for use.
Innovation Solution
A sensing system with a sensor electronics device that includes a connection detection device, delay circuit, and hydration detection mechanisms to ensure electrodes are sufficiently hydrated before power is applied, using methods such as electrical detection circuits, AC or DC signals, and impedance/resistance measurement to determine hydration status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor is activated immediately after insertion, then the device complexity is reduced and ease of operation is improved, but the measurement precision deteriorates due to non-hydrated electrodes
Solution Approach 1:
The system performs preliminary hydration detection before activating the sensor for measurement. The controller detects whether the electrode is sufficiently hydrated before allowing normal operation, ensuring measurement precision is not compromised while maintaining ease of operation through automated detection
Solution Approach 2:
The system implements feedback by continuously monitoring hydration status and providing signals to the controller. Based on the detected hydration level, the controller either enables or disables normal sensor operation, creating a closed-loop system that ensures accurate measurements while simplifying user operation
2Measurement precision
If a manual hydration check procedure is implemented, then the measurement precision is improved, but the ease of operation deteriorates and loss of time increases
Solution Approach 1:
The system performs self-service by automatically detecting electrode hydration status without requiring user intervention. The detection circuit and controller work autonomously to determine readiness for measurement, eliminating manual procedures while maintaining measurement precision
Solution Approach 2:
The patent replaces manual mechanical hydration checking with an electrical detection system. The detection circuit uses electrical signals to assess hydration status, substituting mechanical user actions with automated electronic detection to improve both ease of operation and measurement precision
3Measurement precision
If the sensor stabilization time is extended, then the measurement precision is improved, but the loss of time increases and productivity decreases
Solution Approach 1:
The system uses feedback from the detection circuit to determine when hydration is sufficient. Rather than using a fixed extended stabilization time, the controller continuously monitors hydration status and enables measurement as soon as adequate hydration is detected, reducing unnecessary waiting time while ensuring measurement precision
Solution Approach 2:
The stabilization period is made dynamic rather than fixed. The system adjusts the effective stabilization time based on actual hydration conditions detected by the detection circuit, allowing the sensor to become operational as soon as hydration requirements are met, thereby reducing time loss while maintaining measurement quality
4Measurement precision
If automated hydration detection is implemented, then the measurement precision is improved and ease of operation is maintained, but the device complexity increases
Solution Approach 1:
The detection circuit serves multiple functions: it detects electrode hydration status, provides feedback to the controller, and enables automated control of sensor operation. By making the detection circuit multi-functional, the patent improves measurement precision without proportionally increasing device complexity
Solution Approach 2:
The patent merges the detection circuit, controller, and sensor into an integrated system. The detection circuit is combined with the existing sensor electronics, and the controller integrates hydration detection with normal sensor operation control, reducing overall system complexity while achieving automated hydration detection and improved measurement precision
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
Reduces stabilization time and ensures accurate initial readings by automatically determining when the sensor is hydrated and ready for use, enhancing patient convenience and measurement reliability.
Implementation Method 1
A detection circuit is utilized to detect changes in capacitance or impedance indicating hydration
Implementation Method 2
Impedance measuring device measures impedance across the sensor electrodes to determine hydration status
Data Source
AI summary
A sensor system includes a sensor and a sensor electronics device. The sensor includes a plurality of electrodes. The sensor electronics device includes a connection detection device, a power source, and a delay circuit. The connection detection device determines if the sensor electronics device is connected to the sensor and transmits a connection signal. The delay circuit receives the connection signal, waits a preset hydration time, and couples the regulated voltage from the power source to an electrode in the sensor after the preset hydration time has elapsed. Alternatively, the sensor electronics device may include an electrical detection circuit and a microcontroller. The electrical detection circuit determines if the plurality of electrodes are hydrated and generates an interrupt if the electrodes are hydrated. A microcontroller receives the interrupt and transmits a signal representative of a voltage to an electrode of the plurality of electrodes.