3D Printing Solutions for Microfluidic Chip-To-World Connections.

Area of Science:

• Microfluidics
• Additive Manufacturing
• Biocompatible Materials

Background:

• Connecting microfluidic chips to external systems via tubes and wires presents significant challenges.
• Existing connection methods often lack reliability and ease of use, hindering microfluidic applications.

Purpose of the Study:

• To present 3D printing methods for fabricating microfluidic chip holders with robust fluidic and electrical connections.
• To address the issue of cytotoxic residue leakage from 3D-printed materials in bioanalysis.

Main Methods:

• Microstereolithography was used to create high-resolution 3D-printed chip holders.
• Integrated O-rings provided fluidic sealing, and spring probes ensured electrical connectivity.
• Parylene-C coating was applied to mitigate cytotoxicity of the 3D-printed resin.

Main Results:

• The 3D-printed holders facilitated easy chip replacement without gluing or wire bonding.
• Automatic alignment of spring probes and O-rings was achieved due to fixed positioning.
• Parylene-C coating successfully resolved issues with cytotoxic residue leakage.

Conclusions:

• 3D-printed chip holders offer a reliable and user-friendly solution for microfluidic chip-to-world interconnections.
• The combination of cleanroom-fabricated chips and 3D-printed holders ensures biocompatibility, optical transparency, and precise sample handling.
• This technology paves the way for the fabrication of complete, integrated microfluidic devices using additive manufacturing.