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Designing a Bioreactor to Improve Data Acquisition and Model Throughput of Engineered Cardiac Tissues
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Modeling nutrient consumptions in large flow-through bioreactors for tissue engineering.

Mamatha Devarapalli1, Benjamin J Lawrence, Sundararajan V Madihally

  • 1School of Chemical Engineering, Oklahoma State University, 423 Engineering North, Stillwater, Oklahoma 74078, USA.

Biotechnology and Bioengineering
|May 8, 2009
PubMed
Summary

Optimizing flow-through bioreactors for tissue regeneration requires understanding dynamic changes in porous scaffolds. Novel bioreactor designs enhance nutrient distribution and hydrodynamic stress for better tissue engineering outcomes.

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Area of Science:

  • Biomedical Engineering
  • Tissue Engineering
  • Bioreactor Design

Background:

  • Flow-through bioreactors are crucial for tissue regeneration, ensuring nutrient supply and controlled hydrodynamic forces.
  • Designing bioreactors for large, high aspect ratio tissues (e.g., skin, cartilage) lacks defined principles.
  • Tissue regeneration dynamically alters scaffold properties, impacting transport phenomena.

Purpose of the Study:

  • To investigate the influence of changing porous characteristics on transport phenomena during tissue regeneration.
  • To evaluate bioreactor designs for optimal nutrient distribution and hydrodynamic stress.
  • To determine minimum flow rates for supporting different cell types (SMCs, chondrocytes, hepatocytes).

Main Methods:

  • Computational fluid dynamics (CFD) simulations using the Brinkman equation for porous media.
  • Analysis of pressure drop, shear stress, and nutrient consumption patterns.
  • Evaluation of convective diffusion and Michaelis-Menten kinetics for nutrient consumption.

Main Results:

  • A circular bioreactor with semicircular inlets/outlets improved hydrodynamic stress and nutrient uniformity.
  • Oxygen consumption exceeded glucose consumption across all tested cell types.
  • Hepatocytes required significantly higher flow rates compared to SMCs and chondrocytes.

Conclusions:

  • Bioreactor geometry significantly impacts nutrient and hydrodynamic uniformity in tissue regeneration.
  • Cell type and density necessitate adjustments in flow rates for optimal tissue engineering.
  • Optimized bioreactor design is essential for efficient regeneration of large tissues.