Multicellular Cell Seeding on a Chip: New Design and Optimization towards Commercialization.

Area of Science:

• Biomedical Engineering
• Microfluidics
• Tissue Engineering

Background:

• Tissue-on-chip models require optimized microfluidic platforms for disease research.
• Microfluidic chips often use micro-posts to separate channels, but their design and fabrication are not optimized for scale.
• Previous designs lack cost-efficient and rapid fabrication methods for commercialization.

Purpose of the Study:

• To optimize microfluidic chip design for 3D multicellular co-culture applications.
• To investigate the impact of micro-post structure and spacing on chip performance.
• To develop a rapid and cost-efficient fabrication method for tissue-on-chip models.

Main Methods:

• Experimental studies on a microfluidic platform.
• In-depth theoretical analysis including COMSOL simulations and analytical solutions.
• Computer-aided manufacturing (CAM) simulations for fabrication process evaluation.

Main Results:

• Successful cell seeding achieved when pressure drops across posts exceed those across channel width.
• Circular micro-posts demonstrated superior barrier effects, preventing channel cross-contamination.
• CAM simulations confirmed circular-post fabrication is faster and simpler than hexagonal posts using micro-milling.

Conclusions:

• Optimized microfluidic chip design using circular micro-posts enhances barrier function and cell seeding.
• Circular micro-posts facilitate rapid, cost-efficient, large-scale fabrication via micro-milling and injection molding.
• This approach advances commercialization of tissue-on-chip technology for disease modeling.