Otherwise this friction and turbulence is translated into resistance to blood flow with increased pressure in the blood flow path. The invention herein described compensates for the need to curve a catheter by expanding the diameter of the lumens in the bend to neutralize the increased friction and turbulence which is created by the bend. If they are bent accidentally or for tape-down purposes, blood flow is restricted, or worse, the catheters will kink and occlude. All work well when they are maintained in a straight fashion. They are the coaxial configuration, the side-by-side configuration and the triple-lumen configuration in which a third smaller lumen for placement over a guide wire is located in the partition between the two blood transmission channels. The multilumen catheter of claim 1 wherein said arcuate intermediate section circumscribes an arc of substantially 180 degrees.Ī dual lumen catheter for use in hemodialysis treatment and the like.Ĭurrently, there are three basic catheter configurations available for temporary hemodialysis. Them multilumen catheter of claim 3 wherein said reduced tip of said second extraction section includes a plurality of extraction apertures formed therethrough and said reduced tip of said second return region includes a return aperture formed therethrough.ĥ. The multilumen catheter of claim 2 wherein said second extraction region includes a reduced tip on the end thereof and said second return region includes a reduced tip on the end thereof.Ĥ. The multilumen catheter of claim 1 wherein said second return region is concentrically disposed within said second extraction region.ģ. 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.Ģ.
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