Magnetic-adhesive based valves for microfluidic devices used in low-resource settings

Area of Science:

• Biomedical Engineering
• Microfluidics
• Lab-on-a-Chip Technology

Background:

• Micro total analytical systems (μTASs) and lab-on-a-chip (LOC) platforms offer revolutionary potential for public health applications.
• Current LOC technologies face limitations in low-resource settings due to complex, costly, and power-dependent off-device hardware for microfluidic control.

Purpose of the Study:

• To develop a simple, low-cost, and easily operable valve for controlling fluid flow and reagent storage in microfluidic devices.
• To enable the practical application of lab-on-a-chip technology in resource-limited environments and point-of-care settings.

Main Methods:

• A novel magnetic-adhesive based valve was designed, utilizing a neodymium magnet and adhesive ring to seal a port between microfluidic chambers.
• Actuation is achieved by an external magnet, unseating the internal magnet to open the port without compromising device integrity.
• Demonstrated on-device reagent storage and controlled transport for reactions between chambers.

Main Results:

• The magnetic-adhesive valve is simple to construct and operate, with a material cost of $0.20 per valve.
• Requires no external power or instrumentation, operable by individuals with no technical training using only a hand-held magnet.
• Valve actuation maintains the sealed integrity of the microfluidic device, enhancing safety for handling potentially hazardous substances.

Conclusions:

• This magnetic-adhesive valve design significantly simplifies microfluidic control for μTASs and LOC devices.
• The technology has the potential to facilitate the development of practical lab-on-a-chip systems for point-of-care and low-resource settings.
• Enables wider accessibility and application of advanced microfluidic assays in diverse environments.