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Local Microbubble Removal in Polydimethylsiloxane Microchannel by Balancing Negative and Atmospheric Pressures.

Yasunori Tokuoka1, Tadashi Ishida1

  • 1Department of Mechanical Engineering, School of Engineering, Institute of Technology, Tokyo 226-8503, Japan.

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Summary

A novel microfluidic method locally removes microbubbles, protecting long-term cell cultures in drug development. This technique prevents microbubble damage to tissues during extended perfusion tests.

Keywords:
local removallong-term perfusionmicrobubblesmicrofluidicspolydimethylsiloxane

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Drug Development

Background:

  • Long-term organoid and tissue experiments are vital for drug development.
  • Microfluidic devices are commonly used but susceptible to microbubble formation.
  • Microbubbles can damage and starve cells, compromising experimental integrity.

Purpose of the Study:

  • To develop a localized microbubble removal method for microfluidic devices.
  • To mitigate the detrimental effects of microbubbles on cells and tissues in microfluidic systems.
  • To enable reliable long-term cell culture experiments in microfluidics.

Main Methods:

  • A microfluidic device with thin (0.5 mm) polydimethylsiloxane sidewalls was engineered.
  • Localized negative pressure was applied to selectively remove microbubbles.
  • The thin sidewalls balanced pressures, confining the negative pressure effect.
  • A 72-hour long-term perfusion test was conducted using the developed method.

Main Results:

  • Microbubbles were effectively removed within a 5 mm radius of the pressurized chamber.
  • Microbubbles beyond 7 mm from the chamber remained unaffected.
  • No contact between microbubbles and simulated tissue was observed during the 72-hour perfusion test.
  • The localized negative pressure method proved compatible with long-term cell culture.

Conclusions:

  • The developed local microbubble removal technique enhances the reliability of long-term microfluidic experiments.
  • This method protects cellular structures from microbubble-induced damage.
  • It offers a promising solution for advancing drug development through improved microfluidic cell culture models.