Dual-Sensor Glucose Test System for Temperature Compensation
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Solution Overview
Problem
Blood glucose meters face inaccuracies in measuring blood glucose concentration due to temperature discrepancies between the reagent and the temperature sensing elements, leading to erroneous results and slow response to environmental temperature changes.
Innovation Solution
A test sensor system with temperature differential measurement capabilities, utilizing thermocouples or resistive components with equivalent resistance to accurately determine temperature differences between the reagent and the sensing elements, ensuring precise glucose concentration calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single temperature sensor is placed inside the blood glucose meter to measure ambient temperature, then the device structure is simple, but the measurement precision of reagent temperature is poor due to temperature discrepancies between the sensor and reagent
Solution Approach 1:
The temperature sensing function is segmented into two separate sensors: one positioned at the reagent location and another at the ambient environment location. This segmentation allows independent measurement of reagent temperature and ambient temperature, resolving the accuracy issue while maintaining manageable system complexity through modular sensor placement.
Solution Approach 2:
The temperature sensing system implements local quality by placing temperature sensors at specific locations where temperature measurements are most critical - directly at the reagent site and at the ambient environment site. This ensures that each sensor measures the temperature most relevant to its location, improving overall measurement precision without requiring a complex distributed sensing network.
2Measurement precision
If the blood glucose meter assumes reagent temperature equals ambient temperature reading, then the calculation is simple, but the blood glucose concentration measurement accuracy decreases due to temperature differences
Solution Approach 1:
The system implements feedback by continuously monitoring both reagent temperature and ambient temperature, then using these measurements to dynamically adjust the blood glucose concentration calculation. The processor receives temperature data from both sensors and applies appropriate compensation algorithms, ensuring accurate glucose measurements while maintaining computational simplicity through automated feedback-based correction.
Solution Approach 2:
The system applies parameter changes by using the measured temperature difference between reagent and ambient environment to adjust the calculation parameters for blood glucose concentration. The processor modifies the interpretation of the electrochemical signal based on the actual reagent temperature, thereby improving measurement accuracy without requiring complex hardware changes.
3Adaptability or versatility
If heat sources are present within the blood glucose meter, then the device can perform additional functions, but erroneous blood glucose measurements result due to increased temperature
Solution Approach 1:
The dual-temperature sensing system provides feedback that enables the processor to detect and compensate for temperature increases caused by internal heat sources. By continuously monitoring reagent temperature separately from ambient temperature, the system can identify when heating occurs and adjust the glucose calculation accordingly, maintaining measurement accuracy despite the presence of functional heat-generating components.
Solution Approach 2:
The system extracts the temperature measurement function from the ambient environment and places it directly at the reagent location. This extraction allows the system to independently measure reagent temperature without being influenced by ambient conditions or internal heat sources, thereby isolating the critical measurement from sources of error while preserving device functionality.
4Speed
If the blood glucose meter responds slowly to environmental temperature changes, then thermal stability is maintained, but the response time to accurate measurement is delayed
Solution Approach 1:
The temperature monitoring system is segmented into two independent measurement points: reagent temperature and ambient temperature. This segmentation allows the system to respond quickly to environmental changes through the ambient sensor while maintaining thermal stability at the reagent site through separate monitoring, enabling differentiated response strategies for each location.
Solution Approach 2:
The system performs preliminary action by measuring ambient temperature in advance and using this information to predict or prepare for upcoming temperature changes that may affect the reagent. The processor can pre-adjust calculation parameters based on ambient trends, enabling faster effective response to environmental changes while maintaining reagent thermal stability.
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 enhances the accuracy of blood glucose measurements by accounting for temperature discrepancies, providing more reliable and responsive results to environmental changes.
Implementation Method 1
The third conductive trace includes a different material than the first conductive trace such that a first thermocouple is formed at the first temperature sensing interface. The first thermocouple provides temperature data to assist in determining the fluid analyte concentration.
Implementation Method 2
The first temperature element and the second temperature element each include one or more resistive components. The resistive components of the first temperature element have a substantially equivalent resistance to the resistive components of the second temperature element.
Data Source
AI summary
A test sensor includes a body, a first conductive trace, a second conductive trace, and a third conductive trace. The body includes a first region that has a fluid-receiving area, a second region separate from the first region, and a first temperature sensing interface disposed at or adjacent to the fluid-receiving area. The fluid-receiving area receives a sample. The first trace is disposed on the body, and at least a portion of the first trace is disposed in the first region. The second and third traces are disposed on the body. The third trace extends from the first to the second regions. The third trace is connected to the first trace at the first temperature sensing interface. The third trace includes a different material than the first trace. A first thermocouple is formed at the first temperature sensing interface. The thermocouple provides temperature data to determine an analyte concentration.