Automated Flushing System for Post-Processing in Microfluidic Device Fabrication

Area of Science:

• Microfluidics
• 3D Printing
• Biotechnology

Background:

• Post-processing of microfluidic devices fabricated with Digital Light Processing Stereolithography (DLP-SLA) is a significant challenge.
• Manual flushing methods are inefficient, inconsistent, and risk damaging delicate microfluidic components like valves and pumps.
• Increasing device complexity and port count exacerbate these post-processing difficulties.

Purpose of the Study:

• To develop the first fully automated flushing system for DLP-SLA 3D-printed microfluidic devices.
• To address the limitations of manual post-processing by introducing a reliable and scalable solution.
• To improve the fabrication workflow for complex microfluidic devices.

Main Methods:

• Implementation of a standardized chip-to-chip (C2C) interconnect architecture.
• Development of an electronically controlled pneumatic routing platform with pressure controllers, sensors, and rotary valves.
• Creation and experimental validation of a fluidic-circuit model to predict pressure drops across device structures.

Main Results:

• Demonstration of robust and repeatable flushing of passive and active microfluidic elements, including channels, valves, and pumps.
• Successful application of the system to complex devices such as mixers and concentration-gradient generators.
• Significant improvement in valve membrane survival rates and elimination of manual handling during post-processing.

Conclusions:

• The developed automated flushing system provides a scalable foundation for post-processing 3D-printed microfluidics.
• This technology significantly enhances the practicality of DLP-SLA for fabricating complex, multi-layered microfluidic devices.
• The system offers improved efficiency, reliability, and component survival in microfluidic device fabrication.