Offset-Corrected Reflectance for Glucose Measurement
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Solution Overview
Problem
Existing glucose measurement systems in body fluids face inaccuracies due to environmental factors like temperature and humidity, which are not adequately accounted for in current methods, leading to potential false readings and reduced measurement accuracy.
Innovation Solution
A method that includes a layered test element with an enzyme-based chemistry layer responsive to analytes, using a photometric reflectance measuring device to detect reflectance values, correcting these values with a predetermined offset specific to the test element to account for environmental influences, and determining analyte concentration using offset-corrected values, while also calibrating the device to zero device-specific offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration measurement on a black field is implemented to account for device signal offset, then device-specific measurement accuracy is improved, but test element-specific environmental influences (temperature, humidity) are not accounted for
Solution Approach 1:
The patent applies preliminary action by determining a test element-specific offset value before actual measurements are performed. This offset value, which accounts for environmental influences on the test element, is calculated in advance and stored for subsequent use in correcting measurements, thereby proactively compensating for environmental variations rather than reacting to them during measurement
Solution Approach 2:
The patent introduces an intermediary offset value that mediates between the raw reflectance signal and the final concentration calculation. This offset value acts as a correction factor that accounts for test element-specific environmental influences, separating the device signal offset from the test element environmental offset, and allowing independent correction of each
2Measurement precision
If the reflectance measurement range is limited by an offset value, then the lower detection limit is defined, but the measurable range is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the offset correction based on the measured reflectance value. When the reflectance exceeds a threshold value, a different offset correction is applied compared to when it remains below the threshold, allowing the system to adapt the measurement range and maintain precision across varying concentration levels
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 enhances measurement accuracy by correcting for test element-specific offsets and environmental factors, ensuring reliable glucose concentration determination even under varying conditions, providing precise and unambiguous results.
Implementation Method 1
providing a layered test element including an enzyme-based chemistry layer which is responsive to the analyte by a color change
Implementation Method 2
detecting by means of a photometric reflectance measuring device a reflectance value of the test element
Data Source
AI summary
The invention concerns a method and an apparatus for determining the concentration of an analyte in a body fluid, where the following measures are proposed: providing a layered test element (12) including an enzyme-based chemistry layer which is responsive to the analyte by a color change, applying a sample of the body fluid onto the test element (12), detecting by means of a photometric reflectance measuring device (16) a reflectance value of the test element (12), correcting the measured reflectance value by a predetermined offset value attributed to the test element (12), determining a concentration value of the analyte using the offset-corrected reflectance value.