What does the term "dual lumen" refer to in ECMO cannulas like the Avalon?

The term "dual lumen" in the context of ECMO cannulas, such as the Avalon, specifically refers to a design that allows for both drainage and return functions within a single device. This means that one lumen is responsible for drawing blood away from the patient's body to be oxygenated, while the second lumen returns the oxygenated blood back into the patient. This integrated function enhances the efficiency of the ECMO circuit by minimizing the number of cannulas required, simplifying the insertion process, and improving patient comfort.

Moreover, the dual lumen design is particularly advantageous in certain clinical scenarios, such as in patients with limited vascular access or when minimizing potential infection sites is crucial. It allows for a continuous flow of blood through the system while optimizing space within blood vessels, reducing trauma and complications.

In contrast, options referencing multiple drain sites or double lumen ventilation do not accurately describe the specific function of a dual lumen cannula in ECMO. The focus on temporary placement also does not capture the critical functional aspect of how a dual lumen cannula is utilized within the ECMO circuit.