Microfluidic Analyte Sensor Gaps for Multi-Range Detection
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Solution Overview
Problem
Developing countries face challenges in accurate and accessible healthcare diagnostics due to limited access to fully equipped laboratories, necessitating the development of affordable, user-friendly, and rapid point-of-care devices for infectious disease detection.
Innovation Solution
A microfluidic device with varying sensor gaps and integrated fuel cells for analyte detection, utilizing analyte capturing molecules and silver dendrite formation to bridge sensor gaps, enabling sensitive and quantitative analysis without external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors with different gap sizes are used to achieve different sensitivities, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The device is segmented into multiple sensors, each with different gap sizes (first sensor with gap g1, second sensor with gap g2 where g1 ≠ g2). Each sensor segment targets different analyte concentration ranges, enabling multi-range detection without requiring a single complex sensor design.
Solution Approach 2:
Different regions of the device (different sensors) have different local properties (different gap sizes) optimized for specific detection needs. The first sensor has a gap optimized for high sensitivity to low analyte concentrations, while the second sensor has a different gap for detecting higher concentrations, allowing each local region to excel at its specific function.
2Measurement precision
If analyte capturing molecules are immobilized in the sensor gap to enhance detection, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The capturing molecules are pre-immobilized on the substrate in the sensor gap region before final device assembly. This preliminary functionalization allows for optimized molecule placement and orientation, enhancing detection precision while the gap dimensions are predetermined by the substrate design rather than requiring post-manufacturing adjustment.
Solution Approach 2:
The substrate acts as an intermediary element that provides a stable platform for immobilizing capturing molecules. The substrate's essentially electrically isolating properties enable precise control of the electric field in the gap while supporting the biological capturing molecules, decoupling the electrical measurement requirements from the biological functionalization requirements.
3Measurement precision
If the sensor gap is made smaller to increase sensitivity, then measurement precision is improved, but device complexity increases due to tighter manufacturing tolerances
Solution Approach 1:
The detection system is divided into multiple sensor segments with different gap sizes rather than using a single small gap for all measurements. This segmentation allows each sensor to operate in an optimized gap regime for its specific detection range, avoiding the need for extremely tight tolerances across the entire device.
Solution Approach 2:
The gap size parameter is varied between different sensors (g1, g2, ...) to optimize detection for different analyte concentration ranges. By changing this critical parameter across multiple instances rather than optimizing a single instance, the system achieves high sensitivity where needed while maintaining manufacturability through relaxed tolerances on other sensors.
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 device allows for accurate and quick detection of multiple analytes with varying concentrations, providing reliable diagnostic information at the point of care, even in resource-limited settings.
Implementation Method 1
at least one analyte capturing molecule is immobilized in the gap on the substrate. The at least one capturing molecule is adapted to capture at least one analyte of a fluid sample
Implementation Method 2
silver enhancement for signal amplification
Data Source
AI summary
Microfluidic device (1) comprising at least one fluid channel (2) comprising at least one inlet (3), wherein said at least one fluid channel (2) is fluidly connected to a first sensor (4) downstream of said at least one fluid inlet (3), wherein the first sensor (4) comprises at least one sensor cathode (5) and at least one sensor anode (6) formed on an essentially electrically isolating substrate (7), wherein the sensor cathode (5) and the sensor anode (6) are spaced apart by a gap (8) formed on the electrically isolating substrate (7), and wherein at least one analyte capturing molecule (9) is immobilized in the gap (8) on the substrate (7), wherein the at least one capturing molecule (9) is adapted to capture at least one analyte (10) of a fluid sample introduced into the inlet (3) and transported to the first sensor (4).