3D-printed self-sensing magnetically actuated microfluidic chip for closed-loop drug delivery.

Area of Science:

• Microfluidics
• Biosensing
• Additive Manufacturing

Background:

• Microfluidic lab-on-a-chip technology offers significant potential in bioscience, medical diagnostics, and environmental monitoring.
• Widespread adoption is limited by challenges in functional integration, operational autonomy, and scalable manufacturing.
• Existing microfluidic systems often require bulky external pumps and complex control mechanisms.

Purpose of the Study:

• To develop a 3D-printed, self-sensing, magnetically actuated microfluidic (SMAM) chip for autonomous bioanalysis.
• To overcome limitations of current microfluidic technologies regarding integration, autonomy, and scalability.
• To demonstrate a novel approach for intelligent, automated microfluidic devices.

Main Methods:

• Utilized stereolithography apparatus (SLA) 3D printing for rapid prototyping and integration of microchannels and a magnetic actuation module.
• Implemented magnetic actuation for wireless fluid manipulation, eliminating the need for external pumps.
• Integrated a self-sensing mechanism for real-time flow monitoring and on-chip analyte detection.

Main Results:

• Achieved a high pumping flow rate of up to 972 μL min⁻¹.
• Demonstrated good piezoresistive sensitivity of 43.1 MPa⁻¹ for self-sensing capabilities.
• Successfully assembled the SMAM chip into a modular, wirelessly monitored platform and validated its use in a drug release application.

Conclusions:

• The 3D-printed SMAM chip offers a novel solution for autonomous bioanalysis, addressing key limitations in microfluidic technology.
• The device enables precise, wireless fluid control and integrated sensing, paving the way for intelligent analytical devices.
• This technology promises to enable new paradigms in automated biological research, diagnostics, and therapeutic interventions.