Catheter and catheter assemblies for extracorporeal circulation of body fluids, such as blood, are described. A catheter includes a septum that divides an internal lumen into fluidicly isolated drainage and infusion lumens. The infusion lumen extends along only a portion of the axial length of the catheter and terminates at an infusion opening defined by the circumferential wall of the elongate member of the catheter. The drainage lumen extends the full axial length of the catheter and is laterally accessible via first and second sets of drainage openings.
