A gravity-driven droplet fluidic point-of-care test
Hamed Vahabi1, Jason Liu1, Yifan Dai1
1Department of Biomedical Engineering, Duke University, Durham, NC, 27705.
Device
|October 24, 2023
Summary
We developed a gravity-powered droplet fluidic test for point-of-care diagnostics. This novel device precisely controls droplet movement for multi-step assays like lactate dehydrogenase (LDH) detection.
Area of Science:
- Biomedical Engineering
- Microfluidics
- Point-of-Care Diagnostics
Background:
- Point-of-care testing (POCT) requires precise control over fluid dynamics.
- Existing microfluidic devices often rely on complex external components.
- Developing simple, low-cost diagnostic tools is crucial for global health.
Purpose of the Study:
- To create a gravity-driven droplet fluidic system for point-of-care applications.
- To develop a versatile surface coating toolbox for independent control of wettability and slipperiness.
- To demonstrate the system's capability in performing multi-step enzymatic assays for clinical diagnostics.
Main Methods:
- Fabrication of a POCT device using a toolbox of nine tailored surface coatings.
- Integration of fluidic elements (pumps, resistors, guides) on a highly slippery surface.
- Utilizing gravity for precise manipulation of droplet sequence, timing, and motion.
- Performing a multi-step enzymatic assay for lactate dehydrogenase (LDH).
Main Results:
- Successful development of a surface coating toolbox with independently tunable wettability and slipperiness.
- Demonstration of precise control over droplet movement and interactions using gravity.
- Successful execution of a multi-step enzymatic assay for LDH detection on the developed platform.
Conclusions:
- The gravity-driven droplet fluidic POCT offers a simple and effective platform for complex assays.
- The tailored surface coatings provide independent control over fluid behavior.
- This technology has significant potential for point-of-care diagnosis in resource-limited settings.
