Tip configurations for a multi-lumen catheter

A multi-lumen catheter for insertion into a mammalian body, comprising:

• an elongated catheter body having a proximal end and a distal end, said catheter body including an outer wall enclosing at least a first, second and third lumen, the first and second lumens sharing a first wall, the first and third lumens sharing a second wall, the first and second walls meeting at a central axis of the elongated catheter body to form an angle of approximately 120 degrees from the perspective of the first lumen, the second and third lumens in fluid communication, respectively, with second and third distal openings positioned side by side at approximately the same location at a distal portion of the catheter body, a first distal opening in fluid communication with the first lumen positioned distally of the second and third lumen distal openings, the first lumen transitioning from a first cross-sectional area to a second cross-sectional area larger than the first cross-sectional area distally of the second and third distal openings.