Opportunity
The COVID-19 pandemic exposed critical gaps in global healthcare systems, particularly in diagnostic testing. Laboratories faced overwhelming backlogs due to high sample volumes, leading to delayed results and hindered disease control. Existing point-of-care testing (POCT) devices often lack sensitivity because they rely on detecting pathogens or antibodies indirectly, while molecular tests (e.g., PCR) require complex lab infrastructure, trained personnel, and controlled environments. Contamination risks from amplified nucleic acids further limit decentralized testing. There is a pressing need for a portable, user-friendly, and contamination-proof molecular POCT device that integrates sample processing, amplification, and result interpretation into a single, closed system for untrained users in non-laboratory settings.
Technology
This patent introduces a fully integrated, disposable microfluidic device designed for nucleic acid testing with a "sample-in, result-out" workflow. The device comprises three key components: (1) a sample tube with buffer for initial mixing, (2) a microfluidic reaction tube pre-loaded with dried amplification reagents, and (3) a readout cartridge for visual interpretation. The innovation lies in its closed-system design: the reaction tube locks into the sample tube, forming a sealed unit to prevent contamination. Capillary-driven fluidics and thermally activated valves ensure controlled liquid transfer to reaction chambers, while a puncture mechanism in the readout cartridge releases amplified products onto a lateral flow assay (LFA) strip for colorimetric detection. The device eliminates manual steps (e.g., pipetting, centrifugation) and leverages isothermal amplification (e.g., LAMP) for rapid, equipment-free nucleic acid detection.
Advantages
- Closed-system design: Prevents contamination from amplified products or environmental exposure.
- Portable and user-friendly: No lab equipment or expertise required; suitable for field use.
- Integrated workflow: Combines sample lysis, amplification, and LFA-based detection in one device.
- Passive fluid control: Capillary action and thermal valves automate liquid handling.
- Multiplexing capability: Four reaction chambers enable parallel detection of multiple targets.
- Cost-effective: Disposable and scalable for mass production.
Applications
- Infectious disease screening: Rapid detection of COVID-19, Ebola, dengue, etc., in remote or resource-limited areas.
- Cross-border and hospital testing: High-throughput deployment for outbreak control.
- Cancer diagnostics: Identification of genetic mutations (e.g., chromosomal rearrangements).
- Veterinary and agricultural use: Pathogen detection in livestock or crops.
