Versatile Compartmentalization of Hydrogel-Medium Interfaces in Microfluidic Channels for Reconstructing Complex...

Area of Science:

• Biomaterials Engineering
• Microfluidics
• Tissue Engineering

Background:

• Replicating complex in vivo tissue geometries in vitro is challenging.
• Current micropillar-based microfluidic methods create segmented interfaces, limiting continuous compartment design.

Purpose of the Study:

• To develop a weir-based microfluidic platform for continuous hydrogel patterning in complex, tissue-relevant architectures.
• To establish a predictive design framework for stable hydrogel compartmentalization.

Main Methods:

• Development of a weir-based microfluidic platform.
• Theoretical analysis and computational simulations to predict hydrogel front advancement and interface failure.
• Experimental validation of the design framework and platform capabilities.
• Engineering of complex 3D vascular networks and renal epithelial tubes.

Main Results:

• The weir-based platform enables stable hydrogel patterning across diverse and complex geometries.
• A pressure-based design framework accurately predicts hydrogel filling stability.
• Identified critical intersection geometries prone to failure and provided layout guidelines.
• Successfully engineered interconnected 3D vascular networks and continuous renal epithelial tubes.

Conclusions:

• The developed platform significantly improves the predictability and design versatility of microfluidic hydrogel compartmentalization.
• This approach facilitates the creation of more physiologically relevant tissue models with complex, continuous architectures.
• Enables the study of how local connectivity and spatial architecture influence tissue morphogenesis.