A catheter (10) includes an elongate body (14) having a proximal portion and a distal portion, and a tip (16) having a proximal portion coupled to a distal portion of the elongate body along a longitudinal axis of the elongate body. The elongate body and tip together define a first lumen (42) and a second lumen (46). The elongate body further defines a third lumen (48) extending distally to a body opening (52) defined by the elongate body and in fluid communication with the third lumen. A cross-sectional area, orthogonal to the longitudinal axis, of at least one of the first and second lumens increases from a point proximal to the body opening to a point distal to the body opening.
