The Venous Return Catheters from MAQUET are available in different models to suit every need. The Venous Return Catheters are available as both single and as two-stage catheters. The Venous Return Catheter are used during cardiac surgery, they are designed for venous cannulation during extra-corporeal circulation. The single-stage Venous Catheters are inserted into the superior and inferior vena cava through the right atrial wall. While as the two-stage venous catheter is commonly inserted through the right atrial auricle. This is done is order to position the distal end in the inferior vena cava and the proximal opening of the catheter.