Microfluidic PCR Test Card With Integrated Heating Electrodes
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Solution Overview
Problem
Current POC diagnostic immunoassays lack the sensitivity and specificity of nucleic acid amplification methods, particularly in the early stages of infection, and require complex equipment and processes, while NAATs are cumbersome and expensive.
Innovation Solution
A disposable test card with a microfluidic platform that integrates electrodes for heating and a microchannel system to perform PCR, allowing for rapid, sensitive, and specific detection of infectious agents using a low-cost, user-friendly design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If NAATs are used to achieve high sensitivity and specificity in early infection detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions (sample loading, heating, PCR reaction, and detection) into a single integrated microfluidic test card. The microchannel system merges fluid transport with the heating electrodes, creating a unified platform that performs NAAT functionality without requiring separate complex equipment for each function.
Solution Approach 2:
The patent replaces complex mechanical heating systems with a simple resistive heating mechanism. Instead of requiring external thermal cyclers or complex temperature control mechanisms, the test card uses electrical resistance directly in the microchannel to generate heat for PCR amplification, significantly simplifying the overall device.
2Ease of operation
If immunoassays are used for POC testing, then ease of operation is improved, but sensitivity and specificity deteriorate
Solution Approach 1:
The test card is designed as a self-contained unit where the user simply loads the sample and initiates the test. The microfluidic system automatically handles sample transport, the heating electrodes automatically perform thermal cycling, and the detection system automatically analyzes results. This automation maintains ease of operation while achieving NAAT-level sensitivity through integrated microfluidic PCR.
3Measurement precision
If complex equipment is used for NAATs, then detection sensitivity is improved, but manufacturing cost increases
Solution Approach 1:
The test card is divided into distinct functional layers: a substrate layer with inlet/outlet ports, a microchannel layer with integrated heating electrodes, and a detection layer. This segmentation allows each component to be manufactured independently using standard printing and fabrication techniques, then assembled into a complete test card, significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The patent designs a disposable test card that can be manufactured at low cost and discarded after use. The microfluidic chip and reagents are contained in a single-use card, eliminating the need for expensive, reusable laboratory equipment. This disposable approach reduces both manufacturing cost and the complexity of maintenance and calibration.
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 early detection of infections with high sensitivity and specificity, reducing the need for complex equipment and processes, and is suitable for low-resource settings.
Implementation Method 1
the electrodes are configured to raise the temperature of the fluid sample within the target zone of the microchannel when a current is applied thereto
Data Source
AI summary
Disclosed herein is a test card including at least one fluid inlet port, at least one microchannel, and a plurality of target zones, where the test card is configured to perform a plurality of assays in the plurality of target zones. Also described herein is a method of using the test card to perform a plurality of assays on a fluid sample in the plurality of target zones.