Numerical Evaluation and Prediction of Porous Implant Design and Flow Performance

Area of Science:

• Biomaterials Engineering
• Tissue Engineering
• Computational Fluid Dynamics

Background:

• Porous structures are crucial for mass transfer and tissue regeneration in implants.
• Regular unit cell designs are commonly employed in porous implant fabrication.
• Understanding the interplay between structural parameters and biological performance is essential.

Purpose of the Study:

• To investigate the effect of controlled design on mass transfer and tissue regeneration in porous implants.
• To evaluate how unit cell shape and strut size influence fluid flow properties.
• To establish relationships between physical parameters of porous structures and their flow performance.

Main Methods:

• Parametric design was used to create porous scaffolds with varying strut sizes (0.5-1.1 mm).
• Two unit cell geometries (Octet truss and Rhombic dodecahedron) were selected for comparison.
• Fluid flow simulations were conducted to analyze flow velocity, permeability, and shear stress.

Main Results:

• Unit cell shape and strut size significantly influence implant physical parameters and flow performance.
• Increasing strut size decreases pore size and porosity but increases volume and surface area.
• Smaller strut sizes lead to lower flow velocity but higher permeability and more favorable shear stress for cell proliferation.

Conclusions:

• Porous implants with different unit cell designs exhibit distinct mass transfer and tissue regeneration capabilities.
• Unit cell shape and strut size are critical factors for optimizing porous implant design.
• Findings support quantitative assessment and optimization of porous implants for enhanced biological outcomes.