Asymmetric Triple-Functional Janus Membrane for Blood Oxygenation

Area of Science:

• Biomaterials Science
• Medical Engineering
• Cardiovascular Research

Background:

• Current oxygenation membranes for ECMO face challenges balancing plasma leakage, gas exchange efficiency, and hemocompatibility.
• The asymmetric structure of lung alveoli offers inspiration for improved membrane design.

Purpose of the Study:

• To develop a novel triple-functional Janus oxygenation membrane for ECMO applications.
• To mimic the asymmetric structure of lung alveoli for enhanced membrane performance.

Main Methods:

• Fabrication of a Janus membrane with distinct hydrophobic (polydimethylsiloxane), gas-exchange-enhancing (polyamide), and hydrophilic (polyzwitterionic) layers.
• Simulated ECMO testing to evaluate membrane performance in preventing plasma leakage and thrombus formation.
• Assessment of gas transfer rates (O2 and CO2) and CO2:O2 permeance ratio.

Main Results:

• The Janus membrane demonstrated excellent prevention of plasma leakage and thrombus formation.
• Achieved adequate oxygen transfer rate (17.8 mL min⁻² m⁻²) and carbon dioxide transfer rate (70.1 mL min⁻² m⁻²).
• Exhibited a high CO2:O2 permeance ratio of approximately 10.7, indicating efficient gas exchange.

Conclusions:

• The developed asymmetric triple-functional Janus oxygenation membrane shows significant potential for advancing ECMO technology.
• This novel membrane design offers a promising solution for overcoming current limitations in blood oxygenation devices.
• The Janus architecture provides a versatile platform for creating next-generation oxygenation membranes.