Reader Calibration System for Lateral Flow Assay Consistency
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Solution Overview
Problem
Lateral flow assay test strips produce inconsistent results due to variations in physical properties, manufacturing processes, and environmental conditions, leading to discrepancies in test results even when using the same reagents and analytes.
Innovation Solution
A calibration system comprising an electrical memory chip, optical check, and interface for the reader, which includes a power source, optical check with a calibrated light source, and wireless transmission capabilities, to ensure accurate analyte detection and environmental monitoring, enabling proper calibration and disabling of the reader if conditions exceed thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lateral flow assay test strips are used for testing, then a wide variety of medical and environmental conditions can be detected, but different test strips produce inconsistent results due to variations in physical properties, manufacturing processes, and environmental conditions
Solution Approach 1:
The patent applies parameter changes by using a calibration cartridge that contains reference samples with known analyte concentrations. The reader measures the optical signals from these reference samples and adjusts its measurement parameters (such as signal intensity thresholds and calculation algorithms) to compensate for variations in test strip physical properties, manufacturing differences, and environmental conditions. This recalibration process ensures consistent test results across different test strips while maintaining the ability to detect various analytes.
2Adaptability or versatility
If test strips are stored in hot or humid environments, then testing can be performed in various conditions, but the biological materials on the assay test strip degrade leading to variable results
Solution Approach 1:
The patent implements preliminary action by including environmental monitoring functionality in the calibration cartridge. Before performing the actual assay, the system checks environmental conditions (temperature, humidity) and the stability status of biological materials on the test strip. If degradation is detected or environmental conditions are unsuitable, the system alerts the user or prevents testing, ensuring that only stable test strips under appropriate conditions are used. This preliminary check maintains reliability while allowing flexible storage and usage conditions.
3Productivity
If chemical reagents are applied to the assay, then analyte detection can be performed, but manufacturing process variations cause differences in chemical effectiveness leading to inconsistent results
Solution Approach 1:
The patent applies feedback by using the calibration cartridge with known reference samples to measure the actual performance of chemical reagents on each test strip. The reader compares the measured signals from the reference samples against expected values and uses this feedback to adjust measurement parameters, signal processing algorithms, or calibration factors specific to that test strip. This compensates for manufacturing variations in chemical reagent effectiveness and ensures consistent analytical results across different production batches.
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 calibration system ensures consistent and accurate analyte detection by verifying the reader's optical properties and environmental conditions, reducing inconsistencies and ensuring reliable test results.
Implementation Method 1
an optical check that verifies the optical properties of the detector in the reader
Implementation Method 2
the optical check comprises a calibrated light source that verifies the optical properties of the detector in the reader
Implementation Method 3
a sensor that detects one or more environmental conditions that effect the assay
Data Source
AI summary
The present disclosure relates generally to devices that may be used to calibrate a reader. Such devices may comprise an electrical memory chip, a calibration device comprising an optical check, and an interface that allows interaction with the reader.