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1. A multi-lumen catheter comprising:
a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween, the tubular shaft member having an outer cross-sectional dimension that varies along the length of the tubular shaft member, the tubular shaft member having an inner core made of a first material and an outer layer made of a second material, the inner core having a first lumen and a second lumen defined therein, the first lumen having a first lumen cross-section and a length extending at least along a portion of the length of the tubular shaft member, the first lumen cross-section being substantially uniform along the length of the first lumen, and the second lumen having a second lumen cross-section and a length extending along the length of tubular shaft member, the second lumen cross-section being substantially uniform along the length of the second lumen.
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