Fabrication of gravity-driven microfluidic device.

Area of Science:

• Biomedical Engineering
• Microfluidics
• Cellular Biology

Background:

• Micro total analysis systems (MTAS) offer miniaturized platforms for complex biological assays.
• Accurate manipulation and observation of blood cells are crucial for effective blood diagnostics.
• Existing microfluidic devices face challenges in precise cell focusing and deformation analysis.

Purpose of the Study:

• To develop and characterize a novel microfluidic device for blood analysis.
• To enable precise focusing and alignment of blood cells within microchannels.
• To facilitate the observation of red blood cell deformation using artificial capillary vessels.

Main Methods:

• Fabrication of a microfluidic device using laser ablation on stacked thermosetting resin and fluororesin films.
• Integration of a three-pronged microchannel (50-150 µm width, 45 µm depth) and artificial capillary vessels (5 µm diameter, 100 µm length).
• Utilized gravity, sheath flow, and varied groove patterns for blood cell manipulation and focusing.

Main Results:

• Successfully fabricated a 3D microfluidic device capable of transporting and focusing blood cells.
• Demonstrated the ability of artificial capillary vessels to facilitate red blood cell deformation observation.
• Observed red blood cell deformation under microscopic examination within the fabricated vessels.

Conclusions:

• The developed microfluidic device is effective for blood cell focusing and analysis.
• The artificial capillary vessels provide a suitable environment for studying red blood cell mechanics.
• This technology advances the capabilities of micro total analysis systems for hematological diagnostics.