Dual lumen catheter

A multilumen catheter comprising an extraction lumen including a proximal extraction portion and a return lumen including a corresponding proximal return portion coupled to a medical device, an arcuate intermediate section, and a distal section to be partially placed into the patient wherein the cross-sectional area of said extraction lumen and said return lumen in said proximal section is greater than the cross-sectional area of said extraction lumen and said return lumen in at least a portion of said distal section, said distal extraction portion comprises a first extraction region having a first cross-sectional area and a second extraction having a second cross-sectional area less than said first diameter of said first extraction region disposed in spaced relationship relative to each other by an extraction transition region having a proximal end and a distal end wherein the cross-sectional area thereof decreases from said proximal end and to said distal end and said distal return portion comprises a first return region having a first diameter and a second return region having a second diameter less than said first diameter of said first return region diameter disposed in operative communication relative to each other by a return transition region to reduce the creation of fluid pressure resulting from the flow of fluid through said multilumen catheter.