Closed Microfluidic POCT for Contamination-Free Nucleic Acid Testing
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Solution Overview
Problem
Existing POCT devices face challenges in achieving molecular-based sensitivity without requiring complex machinery, professional operation, and are prone to contamination, making them unsuitable for self-testing by non-medical personnel.
Innovation Solution
A portable, disposable device with a closed system design that integrates isothermal nucleic acid amplification, passive fluid transfer, and visual result interpretation, using a sample-in-result-out principle to prevent contamination and simplify operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If molecular-based testing is used to achieve high sensitivity, then detection sensitivity is improved, but device complexity and need for controlled heating increases
Solution Approach 1:
The patent combines nucleic acid extraction, amplification, and detection functions into a single integrated microfluidic chip. The chip integrates reagent reservoirs, reaction chambers, and detection zones into one device, eliminating the need for separate equipment for each step while maintaining molecular-level detection sensitivity.
Solution Approach 2:
The patent employs isothermal amplification techniques that maintain constant temperature rather than requiring controlled heating cycles. This parameter change from temperature-variable to temperature-constant operation simplifies the device by eliminating complex thermal control systems while preserving amplification sensitivity.
2Measurement precision
If molecular-based testing is used to detect nucleic acid directly, then detection sensitivity is improved, but risk of contamination increases
Solution Approach 1:
The patent introduces a disposable microfluidic chip as an intermediary between the sample and the detection system. This single-use chip prevents cross-contamination between samples and eliminates the need for cleaning and sterilization between uses, while still enabling sensitive molecular detection through integrated reagents and controlled fluid handling.
Solution Approach 2:
The patent employs disposable microfluidic chips that are discarded after a single use. This approach eliminates contamination risks associated with reusable equipment while maintaining cost-effectiveness. Each chip contains pre-loaded reagents and structured pathways that ensure sample containment throughout the testing process.
3Measurement precision
If molecular-based testing with multiple steps is used, then detection accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent divides the complex molecular testing process into distinct functional zones within the microfluidic chip: sample loading area, reagent mixing zone, amplification chamber, and detection region. Each zone performs a specific function, allowing the overall complex process to be simplified into a straightforward sequential operation for the user while maintaining high detection accuracy.
Solution Approach 2:
The microfluidic chip incorporates passive fluid transport mechanisms and pre-loaded reagents that automatically perform mixing, incubation, and detection steps without requiring user intervention. The chip's structured pathways and capillary forces drive fluid movement automatically, eliminating the need for manual mixing, heating, or timing operations while preserving multi-step processing accuracy.
4Measurement precision
If laboratory-based molecular testing is used, then detection sensitivity is improved, but productivity and speed deteriorate
Solution Approach 1:
The patent combines multiple sequential laboratory steps into a single integrated microfluidic device that processes samples continuously. The chip integrates extraction, amplification, and detection in one flow path, allowing samples to move through all stages without manual transfer between equipment, thereby maintaining molecular-level sensitivity while dramatically increasing throughput and reducing turnaround time.
Solution Approach 2:
The microfluidic chip enables continuous sample processing through its integrated flow system. Multiple samples can be loaded and processed simultaneously through parallel channels, and the automated fluid handling eliminates idle time between steps. This continuous operation maintains sensitive molecular detection while significantly improving productivity compared to discrete laboratory procedures.
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 rapid, sensitive, and user-friendly molecular testing for various diseases, suitable for field applications and self-testing by non-trained individuals, with simplified operation and reliable result interpretation.
Implementation Method 1
The reaction tube includes one or more reaction chambers. An individual reaction chamber is arranged to receive a portion of the received sample buffer. The individual reaction chamber includes an amplification reagent for amplifying a test-sample content in the received portion to yield an amplified result
Implementation Method 2
The reaction tube is configured to lock and seal the reaction tube and the sample tube together to create a closed enclosure confining the sample buffer for advantageously avoiding contamination of the sample buffer from outside the sample tube and the reaction tube
Implementation Method 3
A portable, disposable device with a closed system design that integrates isothermal nucleic acid amplification, passive fluid transfer, and visual result interpretation
Data Source
AI summary
A molecular point-of-care testing (POCT) diagnostic device for molecular detection of various diseases with “sample-in-result-out” principle is provided. The device has a sample tube in which a test sample is mixed with a sample buffer, a microfluidic-based reaction tube with a simple flow-based system for amplifying the sample buffer mixed with the test sample to form an amplified result, and a closed-system, disposable result interpretation using colorimetric- or lateral flow assay-based for assaying the amplified result. The device is portable and simple to use, which can help bring laboratory detection to the field.