Triple lumen catheter with occlusion resistant tip

1. A catheter comprising:

an elongated tubular body defining a longitudinal axis and extending to a distal end thereof, the tubular body having a first lumen and a second lumen with a septum disposed therebetween, the tubular body including a first wall that defines the first lumen and a second wall that defines the second lumen, a portion of the septum extending distally beyond the first lumen and the second lumen;

wherein the first wall includes a first wall extension that extends in a spiral configuration from the first lumen about the longitudinal axis and is spaced apart from the portion of the septum; and

the tubular body having a third lumen.

2. A catheter as recited in claim 1 , wherein the third lumen is located coaxially along a longitudinal center axis of the tubular body.

3. A catheter as recited in claim 1 , wherein the third lumen has a substantially circular cross section.

4. A catheter as recited in claim 1 , wherein an exterior of the third lumen is defined by a first outer wall and a second outer wall, the third lumen is separated from the first lumen by said first outer wall, and the third lumen is separated from the second lumen by said second outer wall.

5. A catheter as recited in claim 4 , wherein the first outer wall is bound along a length of the third lumen by a first surface of the septum, and the second outer wall is bound along the length of the third lumen by a second surface of the septum.

6. A catheter as recited in claim 1 , wherein a portion of the third lumen extends distally beyond the first and second lumens.

7. A catheter as recited in claim 1 , wherein the second wall includes a second wall extension that extends in a spiral configuration from the second lumen and is spaced apart from the portion of the septum.

8. A catheter as recited in claim 1 , wherein the first wall extension includes a planar end surface that forms a boundary about the first wall extension and defines the spiral configuration of the first wall extension.

9. A catheter as recited in claim 7 , wherein the first wall extension defines a first cavity and the second wall extension defines a second cavity, the first cavity and the second cavity being symmetrical.

10. A catheter as recited in claim 1 , wherein the third lumen has a substantially wedge shaped cross section.

11. A catheter as recited in claim 10 , wherein the wedge shaped third lumen is separated from said first lumen by a third outer wall, and is separated from said second lumen by said septum.

12. A catheter comprising:

an elongated tubular body defining a longitudinal axis and extending to a distal end thereof, the tubular body having a first lumen and a second lumen with a septum disposed therebetween, the tubular body including a first wall that defines the first lumen and a second wall that defines the second lumen, a portion of the septum extending distally beyond the first lumen and the second lumen;

wherein the first wall includes a first wall extension that extends in a spiral configuration from the first lumen about the longitudinal axis and is spaced apart from the portion of the septum; and

the tubular body includes a third lumen which extends distally beyond the first wall extension.

13. A catheter as recited in claim 12 , wherein the first wall extension defines a concave surface facing said portion of the septum and includes a planar surface that forms a boundary about said concave surface and defines the spiral configuration of the first wall extension.

14. A catheter as recited in claim 12 , wherein the third lumen is located coaxially along a longitudinal center axis of the tubular body.

15. A catheter as recited in claim 12 , wherein the third lumen has a substantially circular cross section.

16. A catheter as recited in claim 12 , wherein an exterior of the third lumen is defined by a first outer wall and a second outer wall, the third lumen is separated from the first lumen by said first outer wall, and the third lumen is separated from the second lumen by said second outer wall.

17. A catheter as recited in claim 16 , wherein the first outer wall is bound along a length of the third lumen by a first surface of the septum, and the second outer wall is bound along the length of the third lumen by a second surface of the septum.

18. A catheter as recited in claim 12 , wherein a portion of the third lumen extends distally beyond said first and second lumens.

19. A catheter as recited in claim 12 , wherein the third lumen has a substantially wedge shaped cross section.

20. A catheter as recited in claim 19 , wherein the wedge shaped third lumen is separated from said first lumen by a third outer wall, and is separated from said second lumen by said septum.

21. A catheter comprising:

an elongated tubular body defining a longitudinal axis and extending to a distal end thereof, the tubular body having a first lumen and a second lumen with a septum disposed therebetween, the tubular body including a first wall that defines the first lumen and a second wall that defines the second lumen, a portion of the septum extending distally beyond the first lumen and the second lumen;

wherein the first wall includes a first wall extension that extends in a spiral configuration from the first lumen about the longitudinal axis and is spaced apart from the portion of the septum; and

the tubular body having a third lumen of substantially circular cross section and extending distally beyond the first and second lumens, said third lumen located coaxially along a center longitudinal axis of said tubular body so to bisect said septum,

an exterior of the third lumen is defined by a first arcuate wall and a second arcuate wall, the third lumen is separated from the first lumen by said first arcuate wall, and the third lumen is separated from the second lumen by said second arcuate wall.

22. A catheter comprising:

an elongated tubular body defining a longitudinal axis and extending to a distal end thereof, the tubular body having a first lumen and a second lumen with a septum disposed therebetween, the tubular body including a first wall that defines the first lumen and a second wall that defines the second lumen, a portion of the septum extending distally beyond the first lumen and the second lumen;

wherein the first wall includes a first wall extension that extends in a spiral configuration from the first lumen about the longitudinal axis and is separated from the portion of the septum,

a blunt tip section is disposed at a distal end of said first wall extension; and

the tubular body has a third lumen.

23. A catheter as recited in claim 22 , wherein said first tip section extends about a distal perimeter of said first wall extension from a surface of said septum to an end surface of said first wall extension in an arcuate configuration.

24. A catheter as recited in claim 22 , wherein the third lumen is located coaxially along a longitudinal center axis of the tubular body.

25. A catheter as recited in claim 22 , wherein the third lumen has a substantially circular cross section.

26. A catheter as recited in claim 22 , wherein an exterior of the third lumen is defined by a first outer wall and a second outer wall, the third lumen is separated from the first lumen by said first outer wall, the third lumen is separated from the second lumen by said second outer wall.

27. A catheter as recited in claim 26 , wherein the first outer wall is bound along a length of the third lumen by a first surface of the septum, and the second outer wall is bound along the length of the third lumen by a second surface of the septum.

28. A catheter as recited in claim 22 , wherein a portion of the third lumen extends distally beyond said first and second lumens.

29. A catheter as recited in claim 22 , wherein the third lumen has a substantially wedge shape cross section.

30. A catheter as recited in claim 29 , wherein the wedge shaped third lumen is separated from said first lumen by a third outer wall, and is separated from said second lumen by said septum.

31. A catheter as recited in claim 22 , wherein the second wall includes a second wall extension that extends in a spiral configuration from the second lumen and is spaced apart from the portion of the septum, and a second blunt tip section is disposed at a distal end of said second wall extension.