A Disposable Electromagnetic Bi-Directional Micropump Utilizing a Rotating Multi-Pole Ring Magnetic Coupling.

Area of Science:

• Microfluidics
• Biomedical Engineering
• Materials Science

Background:

• Electromagnetic bi-directional micropumps (EMBMs) are crucial for portable fluidic devices.
• Current EMBMs face limitations in cost and pump density for disposable multi-channel applications, hindering rapid PCR.
• High disposal costs of rare-earth magnets and low pump density are key challenges.

Purpose of the Study:

• To develop a low-cost, disposable, and high-pump-density EMBM.
• To address the limitations of existing EMBMs for applications like droplet-based oscillatory-flow (DBOF) rapid PCR.
• To enable cost-effective and high-throughput microfluidic systems.

Main Methods:

• Separated rare-earth magnets from the disposable fluidic part for reuse.
• Designed cylindrical holes to store and guide magnets, enabling multi-channel operation with a single motor.
• Fabricated a proof-of-concept prototype with a pump density of 0.28 cm⁻².

Main Results:

• Achieved a maximum flow rate of 0.86 mL/min.
• Demonstrated a maximum backpressure of 0.5 kPa at approximately 50 Hz resonant frequency.
• Successfully developed a multi-channel micropump with reusable magnets and high pump density.

Conclusions:

• The developed EMBM offers a cost-effective solution for disposable microfluidic applications.
• Reusable magnets significantly reduce disposal costs.
• This technology is highly beneficial for low-cost, high-throughput rapid PCR amplification microchips, impacting infectious disease diagnostics.