Indexed Lateral Flow Microarray for Scanner-Free Multi-Analyte Detection
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Solution Overview
Problem
Current lateral flow immunoassays face challenges in providing reliable and immediate visual interpretation of multiple analyte results without external imaging devices, leading to operational complexity and variability in user-dependent results.
Innovation Solution
An indexed lateral flow microarray device with a substrate embedded in a Cartesian (x,y) array format and indexing elements for precise analyte detection, allowing direct visual identification of multiple analytes using positional reference markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lateral flow immunoassays are used for detecting multiple analytes, then the device complexity increases due to the need for external imaging devices and specialized personnel, but the ease of operation decreases and reliability becomes variable due to user-dependent interpretation
Solution Approach 1:
The test strip performs self-interpretation by incorporating visual controls and a grid system that enable users to directly read results without external imaging devices. The control lines and indexed grid patterns allow the test strip to provide its own reference framework for result interpretation, eliminating dependence on complex external equipment.
Solution Approach 2:
The patent introduces an intermediary grid system with control lines that mediates between the analyte detection function and the user interpretation function. This grid serves as a visual intermediary that translates complex detection data into easily interpretable patterns, bridging the gap between the technical detection process and user-friendly reading.
2Measurement precision
If external imaging devices are used for visual interpretation, then the measurement precision improves, but the ease of operation worsens due to the need for specialized personnel and additional equipment
Solution Approach 1:
The test strip utilizes color changes and visual pattern formation to provide precise result interpretation directly on the strip. Control lines and indexed grid patterns create visual contrasts that enable accurate reading without external imaging devices, maintaining precision while dramatically improving ease of operation for end users.
Solution Approach 2:
The test strip is segmented into distinct functional zones including control lines, indexed grid patterns, and analyte detection regions. This segmentation allows each zone to serve a specific interpretive function, enabling users to systematically read and understand results without requiring complex imaging systems or specialized training.
3Reliability
If control elements are added to improve result interpretation, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent merges control elements with the grid system and analyte detection zones into a single integrated test strip structure. The control lines are combined with the indexed grid patterns, creating a unified system where control functions are embedded within the overall strip design rather than adding separate complex components.
Solution Approach 2:
The grid system serves multiple functions simultaneously: it provides indexed positioning for analyte identification, acts as a visual control framework, and enables direct user interpretation. This multi-functionality reduces the need for separate control elements, maintaining reliability while minimizing added 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
Enables clear, at-a-glance interpretation of multiple analytes, enhancing usability and reliability, reducing reliance on external equipment, and improving diagnostic accuracy.
Implementation Method 1
When a liquid sample is introduced to the membrane, capillary action draws it along the length of the strip
Data Source
AI summary
The present invention relates to an indexed lateral flow microarray device (iLFM) for direct visual detection of multiple analytes in biological samples. The device utilizes indexing elements to eliminate the need for imaging scanners or image analysis software typically required for lateral flow strips. As a result, users can easily identify multiple analytes in a biological sample by visually inspecting analyte spots aligned with a set of positional reference markers. The iLFM features a substrate, such as a nitrocellulose strip, embedded with specific analyte affinity capture elements arranged in a Cartesian (x,y) array format simplifying the analysis process, enhancing accessibility, and expanding the potential applications of lateral flow assays in various diagnostic settings. By enabling a direct visual method for detecting multiple analytes, the iLFM has significant potential in areas like clinical diagnostics, environmental monitoring, and food safety, making it a promising tool for rapid and efficient analyte detection.