A catheter includes an elongated catheter body having a proximal portion and a distal portion. A first longitudinally accessible lumen and a second lumen extend side by side within and along the proximal portion, and the first lumen and the second lumen form a single common lumen within the distal portion which extends to a distal end of the distal portion. The first lumen and second lumen are co-axial within the distal portion prior to forming a single common lumen.