New, optimized, dual-lumen cannula for veno-venous ECMO

Area of Science:

• Cardiovascular research
• Medical device engineering
• Extracorporeal life support

Background:

• Veno-venous extracorporeal membrane oxygenation (ECMO) is a critical life support technology.
• Cannula design significantly impacts ECMO efficiency and patient outcomes.
• Optimizing cannula hemodynamics is essential for improving veno-venous ECMO performance.

Purpose of the Study:

• To evaluate a novel, virtually wall-less, dual-lumen, bi-caval cannula for veno-venous ECMO.
• To compare the performance of the new cannula against a standard commercial cannula in vivo.
• To assess hemodynamic parameters including blood flow, suction, and injection pressures.

Main Methods:

• A bovine model (n=5) was used to assess veno-venous ECMO.
• A new 24F virtually wall-less dual-lumen cannula was compared to a 23F commercial dual-lumen control cannula.
• Hemodynamic parameters were recorded at increasing pump speeds from 500 to 2500 RPM.

Main Results:

• The wall-less cannula achieved significantly higher blood flows at all tested RPMs (e.g., 3.02 L/min vs. 2.11 L/min at 2500 RPM).
• Mean venous suction pressures were comparable, with the wall-less cannula showing slightly less negative pressure at higher flows.
• Venous injection pressures were consistently lower with the wall-less cannula compared to the control.

Conclusions:

• The optimized, virtually wall-less dual-lumen cannula offers superior hemodynamic performance in veno-venous ECMO.
• This novel cannula design facilitates higher blood flow rates with reduced recirculation.
• The findings suggest potential for improved efficacy and safety in clinical ECMO applications.