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

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  • 1Department of Mechanical Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.

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|October 27, 2022
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Summary

This study presents a low-cost, disposable electromagnetic bi-directional micropump (EMBM) with reusable magnets. This innovation enhances pump density for multi-channel applications like rapid PCR, reducing costs and improving disease detection.

Keywords:
bi-directional pumpingdiscrete peristaltic micropumpdisposable micropumphigh pump densityhigh-throughput rapid PCRmagnetic coupling

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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.