Dual lumen cannula with expandable lumen

A veno-arterial extracorporeal membrane oxygenation (VA ECMO) system comprising:

• a dual lumen drainage cannula comprising:
• a first drainage tube having a proximal end, a distal end, and at least one aperture proximate to the distal end of the first drainage tube, the first drainage tube defining a first fluid flow path extending between the proximal and distal ends of the first drainage tube;
• a second drainage tube having a proximal end, a distal end, and at least one aperture proximate to the distal end of the second drainage tube, the second drainage tube defining a second fluid flow path extending between the proximal and distal ends of the second drainage tube, wherein, the first drainage tube extends through the second drainage tube and distally beyond the second drainage tube, wherein the distal end of the second drainage tube is coupled to a portion of the first drainage tube between the proximal end and the distal end of the first drainage tube, wherein a cross-sectional area of the second fluid flow path is adjustable;
• a blood pump having an inlet connected to an outlet of the dual lumen drainage cannula;
• an oxygenator connected to an outlet of the blood pump;
• and
• an infusion cannula connected to an outlet of the oxygenator and configured for insertion into a vasculature of a patient.

A method of providing veno-arterial extracorporeal membrane oxygenation (VA ECMO) of a heart, the method comprising:

• providing a dual lumen drainage cannula comprising:
• a first drainage tube having a proximal end, a distal end, and at least one aperture proximate to the distal end of the first drainage tube, the first drainage tube defining a first fluid flow path extending between the proximal and distal ends of the first drainage tube;
• and
• a second drainage tube having a proximal end, a distal end, and at least one aperture proximate to the distal end of the second drainage tube, the second drainage tube defining a second fluid flow path extending between the proximal and distal ends of the second drainage tube, wherein the first drainage tube extends through the second drainage tube and distally beyond the second drainage tube, and wherein the distal end of the second drainage tube is coupled to a portion of the first drainage tube between the proximal end and the distal end of the first drainage tube, wherein a cross-sectional area of the second fluid flow path is adjustable;
• inserting the dual lumen drainage cannula into a first site in a patient's vasculature;
• maneuvering the dual lumen drainage cannula through the patient's vasculature such that the distal end of the first drainage tube is at least within proximity of the patient's pulmonary artery and such that the distal end of the second drainage tube is at least within proximity of the patient's right atrium;
• draining blood through the first drainage tube and the second drainage tube of the dual lumen drainage cannula to a blood pump;
• pumping drained blood from the dual lumen drainage cannula through an oxygenator;
• and
• delivering oxygenated blood to a second site in the patient's vasculature.