Biatrial catheters and cardiopulmonary support systems

A catheter comprising

• a first portion having a proximal end and a distal end,
• a second portion having a proximal end and a distal end and extending between the first portion and a third portion of the catheter, and
• the third portion having a proximal end and a distal end, the distal end defining a distal end of the catheter,
• wherein the first and the second portions comprise an outflow lumen;
• wherein the third portion comprises an inflow lumen and the outflow lumen;
• wherein the first portion has a helical portion having a first length and extending from the distal end of the first portion toward the distal end of the second portion, the helical portion following a helical path having a pitch greater than zero and with a distal end surface of the first portion oriented in a direction away from the catheter;
• and
• wherein the catheter is configured to be inserted into a patient body such that the first portion penetrates an atrial septum and extends into a left atrium and the helical portion is positioned within the left atrium to assist with systemic perfusion with oxygenated blood.