Development of a biomimetic microfluidic oxygen transfer device.

Area of Science:

• Biomedical Engineering
• Cardiovascular Science
• Microfluidics

Background:

• Current blood oxygenators face limitations due to complex circuits and complications like bleeding and clotting.
• A microfluidic prototype offers potential for lower blood prime volume and improved circulation.
• Scaling this device is crucial for clinical applications in respiratory and cardiopulmonary support.

Purpose of the Study:

• To scale a multilayer microfluidic blood oxygenator prototype for clinically relevant oxygen transfer rates.
• To maintain a low prime blood volume essential for cardiopulmonary support and chronic use.
• To enhance device safety and hemocompatibility through biomimetic design and endothelial cell coating.

Main Methods:

• Fabrication and testing of a multilayer microfluidic blood oxygenator.
• Scaling strategies involving expanding surface area and increasing device layers.
• Coating microfluidic channels with human endothelial cells to improve hemocompatibility.
• Blood testing to assess clot formation and gas transfer efficiency.

Main Results:

• Endothelial cell coating significantly inhibited fibrin clot formation compared to non-coated devices.
• Gas transfer efficiency remained unaffected by the endothelial cell lining.
• The microfluidic design promotes biomimetic blood flow, enhancing safety.
• Scaling approaches demonstrated feasibility for increased oxygen transfer rates.

Conclusions:

• The developed microfluidic blood oxygenator, particularly with endothelial cell lining, shows promise for safer and more effective respiratory support.
• Scaling the device architecture and utilizing autologous cells represent a significant advancement for treating acute and chronic lung diseases.
• This technology offers a potential therapeutic avenue for patients requiring extracorporeal gas exchange.