Effect of scaffold architecture on cell seeding efficiency: A discrete phase model CFD analysis

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Computational Biology

Background:

• Scaffold architecture critically influences cell behavior in perfusion culture systems.
• Cell adhesion to scaffolds is vital for differentiation and proliferation.
• Understanding scaffold design's impact is key for effective tissue engineering.

Purpose of the Study:

• To computationally investigate the effect of scaffold architecture on cell adhesion.
• To compare different triply periodic minimal surface (TPMS) geometries for cell culture applications.
• To evaluate scaffold performance under static and dynamic perfusion conditions.

Main Methods:

• Designed four TPMS scaffold models (double-diamond, gyroid, FR-D, Schwarz-primitive) with 80% porosity.
• Simulated cell culture under static (zero inlet velocity) and dynamic (three different inlet velocities) conditions.
• Analyzed cell adhesion and distribution patterns based on scaffold architecture and flow conditions.

Main Results:

• Cell culture efficiency varied up to sevenfold across different scaffold architectures.
• Scaffolds with tortuous microchannels exhibited higher cell culture efficiency than those with straight channels.
• Dynamic culture promoted more homogeneous cell distribution than static culture, where cells agglomerated at the entrance.

Conclusions:

• Scaffold architecture is a crucial design parameter for optimizing cell adhesion and distribution in perfusion culture.
• Tortuous architectures are superior for achieving efficient and widespread cell seeding.
• Computational modeling provides valuable insights for selecting and designing scaffolds for tissue engineering.