Current progress in the development of an intravenous membrane oxygenator

Area of Science:

• Biomedical Engineering
• Cardiovascular Technology
• Respiratory Support

Background:

• Current extracorporeal membrane oxygenation (ECMO) devices face challenges with blood trauma and efficiency.
• Membrane oxygenators are crucial for gas exchange in cardiopulmonary bypass and ECMO.
• Improving convective blood flow around oxygenator membranes is a key area for enhanced performance.

Purpose of the Study:

• To evaluate the gas exchange efficiency and durability of a novel intravenous membrane oxygenator (IMO) design.
• To test the hypothesis that a pulsating balloon mechanism enhances convective mixing and blood-side gas transfer.
• To assess the long-term reliability of the IMO prototype.

Main Methods:

• Six IMO prototypes with hollow fiber membranes and a central pulsating balloon were constructed.
• Prototypes were tested in a mock circulatory loop using physiologic saline and bovine blood.
• Oxygen and carbon dioxide transfer rates were measured under varying pulsation frequencies.
• One prototype underwent a 13-day continuous perfusion durability test with saline.

Main Results:

• Gas exchange efficiency significantly increased with higher frequencies of balloon pulsation.
• The pulsating balloon mechanism demonstrably enhanced convective mixing and cross-flow around the fibers.
• No significant decline in oxygen transfer performance was observed during the 13-day durability test.
• The IMO prototypes showed effective oxygen and carbon dioxide transfer capabilities in vitro.

Conclusions:

• The pulsating balloon design effectively enhances gas exchange in the investigated intravenous membrane oxygenator.
• The IMO demonstrates potential for improved performance in respiratory and circulatory support applications.
• The device shows promising durability and reliability for extended use in extracorporeal circuits.