Low profile occlusion catheter

1. An occlusion catheter system comprising:

a first catheter member having a first lumen extending longitudinally through the first catheter member and a first opening at a distal end of the first catheter member;

a second catheter member having a second lumen extending longitudinally through the second catheter member and a second opening at a distal end of the second catheter member, the second catheter member is positioned over and in spaced apart relationship relative to a proximal section of the first catheter member forming an annular space between the second catheter member and the first catheter member and defining an annular port at the distal end of the second catheter member, the proximal section of the first catheter member resides within the second lumen of the second catheter member and the first catheter member extends beyond the distal end of the second catheter member;

a third catheter member having a third lumen extending longitudinally through the third catheter member, the third catheter member is positioned over a distal section of the first catheter member, the third catheter member having a distal section that extends distally from a distal end of the first catheter member such that the first lumen and the third lumen are in fluid flow communication, whereby the second and third catheter members are spaced apart from each other along a longitudinal axis of the first catheter member with the first catheter member extending there between;

an atraumatic tip member having a proximal section co-axially coupled proximate to a distal end of the third catheter member; and

a separate expandable occlusion member coupled to the second catheter member near the distal end of the second catheter member and to the third catheter member near a proximal end of the third catheter member, the expandable occlusion member being positioned such that a space between the distal end of the second catheter member and the proximal end of the third catheter member is within the expandable occlusion member, wherein the distal end of the first catheter member extends into the third catheter member beyond the expandable occlusion member, and wherein the first catheter member defines a stiffness greater than a stiffness of the second catheter member and greater than a stiffness of the third catheter member, thereby defining a backbone of the catheter system, lending column strength to carry the second catheter member and the third catheter member.

2. The occlusion catheter system of claim 1 , wherein the atraumatic tip member is formed of a biocompatible polymer.

3. The occlusion catheter system of claim 1 , wherein the proximal section of the atraumatic tip member has a generally circular transverse cross-sectional profile and the atraumatic tip member further comprises a distal section having a generally flattened cylindrical shape.

4. The occlusion catheter system of claim 1 , wherein the atraumatic tip is fabricated of a biocompatible metal.

5. The occlusion catheter system of claim 1 , further comprising a pressure sensor operably associated within the first lumen and being in fluid communication with a pressure port, the pressure port positioned distally relative to the occlusion member.

6. The occlusion catheter system of claim 1 , further comprising a proximal hub coupled to and in fluid flow communication with each of the first catheter member, the second catheter member and the third catheter member, the proximal hub including a first fluid pathway and a second fluid pathway, the first fluid pathway in fluid communication with the first and third lumens and the second fluid pathway in fluid communication with the second lumen.

7. The occlusion catheter system of claim 6 , further comprising a fluid source coupled to the proximal hub and in fluid flow communication with the second catheter member and the occlusion member.

8. The occlusion catheter system of claim 6 , further comprising a pressure sensor operably coupled to the proximal hub and in communication with the first catheter member.

9. The occlusion catheter system of claim 1 , wherein a greatest outer diameter of the occlusion catheter system is less than 2.3 mm when the expandable occlusion member is not expanded.

10. The occlusion catheter system of claim 1 , wherein the expandable occlusion member is a balloon.

11. The occlusion catheter system of claim 10 , further comprising: a radio opaque marker fixed to the atraumatic tip member to provide a visual indication of the location of the catheter system during deployment when the radio opaque marker is irradiated.

12. The occlusion catheter system of claim 11 , where the radio opaque marker is formed of a material selected from the group consisting of stainless steel, platinum iridium, a polymer mixed with a radio opaque material, barium sulfate, nitinol, a nitinol reinforced polymer and a suitable radio opaque alloy.

13. The occlusion catheter system of claim 1 , wherein a first radio opaque marker is affixed near a first attachment point, the first attachment point positioned at a proximal end of the expandable occlusion member where the expandable occlusion member is connected to the second catheter member; and

a second radio opaque marker is affixed near a second attachment point, the second attachment point positioned at a distal end of the expandable occlusion member where the expandable occlusion member is connected to the third catheter member.

14. The occlusion catheter system of claim 1 , further comprising pressure sensor wires extending from the proximal section of the first catheter member to a position between the atraumatic tip member and the expandable occlusion member.

15. The occlusion catheter system of claim 1 , wherein the first catheter member is constructed of a material selected from the group consisting of a metal, stainless steel, nitinol, stainless steel braiding over polyurethane, stainless steel helical windings over silicone, stainless steel helical windings over nitinol reinforced polymer, biocompatible metals and metal-reinforced polymers.

16. The occlusion catheter system of claim 1 , wherein the first catheter member is constructed of nitinol.

17. The occlusion catheter system of claim 1 , wherein the first catheter member is constructed of a metal-reinforced polymer.

18. The occlusion catheter system of claim 1 , wherein the third catheter member includes a port passing through a side wall between the distal end and a proximal end of the third catheter member, the port being in fluid communication with the first lumen.

19. The occlusion catheter system of claim 1 , wherein the third catheter member comprises a plurality of segments of distally decreasing stiffness to provide a step-down transition of stiffness toward the atraumatic tip member.

20. The occlusion catheter system of claim 1 , wherein the second catheter member terminates in the annular port at the distal end of the second catheter member.