Test Device Control Value Determination for Body Fluid Analysis
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Solution Overview
Problem
Existing test methods and devices for blood sugar determination in body fluids face challenges in ensuring security against operating and measuring errors, particularly in tape systems where consumable transport and guidance differ from traditional test strip systems.
Innovation Solution
The method involves determining a control value from time-dependent and/or wavelength-dependent changes in measurement signals, processing signals as valid or erroneous based on a preset threshold, and using multiple wavelength recordings to detect errors, including manipulations and environmental effects, while also employing lot control values and signal offsets for quality checks and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement signals are recorded and processed without additional control mechanisms, then the device complexity is reduced, but the reliability of measurement results deteriorates due to potential operating errors and external effects
Solution Approach 1:
The patent applies preliminary action by determining control values from time-dependent and wavelength-dependent changes in measurement signals before final result processing. This preliminary analysis of signal characteristics allows the system to detect and exclude erroneous measurements caused by operating errors or external effects, thereby improving reliability without requiring complex additional hardware
Solution Approach 2:
The patent implements feedback by processing measurement signals through control value determination and comparing them against validity criteria. The system provides feedback on whether measurement signals are valid or erroneous, allowing automatic rejection of faulty measurements and ensuring only reliable results are reported, thus enhancing measurement reliability through a built-in validation loop
2Reliability
If multiple measurement signals at different wavelengths are recorded to detect errors, then the reliability of measurement results is improved, but the productivity decreases due to extended measurement time
Solution Approach 1:
The patent applies periodic action by recording measurement signals at multiple discrete time points during the color development process. Instead of continuous monitoring, the system takes periodic measurements at strategically chosen intervals, allowing sufficient color development while capturing the time-dependent signal changes needed for error detection, thus balancing accuracy with measurement speed
Solution Approach 2:
The patent utilizes parameter changes by measuring at different wavelengths to detect errors. The system records measurement signals at multiple wavelengths and determines control values from wavelength-dependent changes, enabling error detection through spectral analysis without requiring excessive measurement time, thereby maintaining both accuracy and productivity
3Measurement precision
If control values are determined from time-dependent and wavelength-dependent changes in measurement signals, then the measurement precision is improved by excluding external effects, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies universality by using the same measurement signal for multiple purposes: determining the final blood sugar result and simultaneously calculating control values for error detection. The wavelength-dependent and time-dependent changes in the measurement signal serve dual functions, enabling precision improvement without requiring separate dedicated measurement systems, thus avoiding additional device complexity
Solution Approach 2:
The patent implements self-service by having the measurement signal itself provide the information needed for error detection. The control values are derived from the inherent time-dependent and wavelength-dependent characteristics of the measurement signal, allowing the system to self-validate without external intervention or complex additional processing, thereby improving precision while maintaining manageable device complexity
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 significantly reduces falsification of measurement results by excluding external effects and detecting errors, ensuring accurate blood sugar determination with enhanced security and reliability.
Implementation Method 1
the test field is photometrically scanned using a measuring unit of the device to record measurement signals
Implementation Method 2
The signal difference of the measurement signals at different wavelengths is advantageously based on the wetting of the provided test field with the body fluid
Data Source
AI summary
There is provided a test method for analysing a body fluid in which a test tape is used in a test device to successively provide analytical test fields stored on the test tape, wherein body fluid is applied by a user to the test field provided at a time and the said test field is photometrically scanned using a measuring unit of the device to record measurement signals. To increase the measurement reliability, it is proposed that a control value is determined from a time-dependent and/or wavelength-dependent change in the measurement signals and that the measurement signals are processed as valid or discarded as erroneous depending on the control value.