Generation of digitized microfluidic filling flow by vent control

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Microfluidics

Background:

• Microfluidic point-of-care testing (POCT) is crucial for rapid clinical decisions.
• Existing nanointerstice-driven filling techniques lack consistent filling times due to viscosity variations, increasing quantification errors.
• Accurate quantification in microfluidic devices requires simple, rapid flow control without added system complexity.

Purpose of the Study:

• To develop a novel flow control mechanism for microfluidic devices.
• To eliminate quantification errors caused by liquid viscosity variations in microfluidic channels.
• To enhance the reliability and accuracy of microfluidic point-of-care testing.

Main Methods:

• Development of a new control mechanism utilizing two-beam refraction and a single solenoid valve.
• Generation of digitized filling flow, independent of liquid viscosity.
• Validation of the digitized filling flow using immunoassay with liquids of varying viscosities.

Main Results:

• The developed control mechanism successfully generated digitized filling flow.
• The digitized filling flow eliminated errors associated with viscosity changes.
• The method demonstrated validity in immunoassay applications across a range of liquid viscosities.

Conclusions:

• A novel digitized microfluidic filling flow control mechanism has been successfully developed.
• This approach ensures accurate quantification in microfluidic devices, regardless of sample viscosity.
• The digitized microfluidic filling flow is a promising advancement for conventional microfluidic point-of-care testing.