Architecture of Life Support
A tissue engineering scaffold is not merely a passive support — its three-dimensional pore architecture actively directs cell behavior. Pore size controls which cells can enter, porosity determines how much living tissue can grow within, and interconnectivity governs whether nutrients and oxygen can reach cells deep inside the construct. Getting this architecture right is the first critical step in engineering functional tissues.
Pore Size and Cell Migration
Cells migrate through scaffold pores by extending processes (filopodia and lamellipodia) that probe the local geometry. If pores are too small, cells cannot physically squeeze through; if too large, cells cannot bridge across and establish contact with pore walls. The optimal pore diameter typically ranges from 5 to 20 times the cell diameter, depending on cell type and whether migration or attachment is prioritized.
Permeability and Transport
The Kozeny-Carman equation relates scaffold permeability to porosity and pore size, providing a key design parameter for nutrient and oxygen transport. High permeability ensures convective nutrient delivery in perfusion bioreactors, while low permeability causes diffusion-limited regions where cells become hypoxic and die. This simulation computes permeability from your scaffold parameters and visualizes the resulting flow potential.
Design Trade-offs
Every scaffold design faces a fundamental tension: more porosity means more space for cells but less mechanical strength; larger pores improve infiltration but reduce surface area for attachment; higher interconnectivity aids transport but may compromise structural integrity. This simulator helps you navigate these trade-offs by visualizing the coupled effects of pore geometry on cell infiltration, nutrient transport, and available surface area simultaneously.