A Biochip with a 3D microfluidic architecture for trapping white blood cells

Area of Science:

• Biomedical Engineering
• Microfluidics
• Cell Biology

Background:

• Accurate single-cell analysis is crucial for disease monitoring.
• Existing methods for cell trapping can be inefficient or complex.
• Microfluidic devices offer potential for precise cell manipulation.

Purpose of the Study:

• To develop and characterize a novel microfluidic biochip for efficient single white blood cell (WBC) trapping.
• To evaluate the biochip's trapping efficiency and capacity.
• To explore its potential applications in cell imaging and point-of-care diagnostics.

Main Methods:

• Microfabrication of a biochip with an array of microholes using standard surface micromachining.
• Delivery of WBC-containing samples to the biochip at controlled pressures.
• Assessment of trapping efficiency at varying cell concentrations.
• Imaging of trapped cells using a standard fluorescent microscope.

Main Results:

• Achieved a high trapping efficiency (> 87%) for WBCs at an optimal pressure of 3 psi.
• The biochip can trap up to 7,500 cells with high efficiency, even at low cell numbers (~200 cells).
• Demonstrated successful single-cell confinement and mechanical immobilization.

Conclusions:

• The developed microfluidic biochip enables efficient and precise trapping of single white blood cells.
• It serves as a standalone unit for cell imaging and can be integrated into portable diagnostic platforms.
• This technology holds promise for advancing point-of-care monitoring of human diseases.