7 235 070

7,235,070 Title:

Ablation fluid manifold for ablation catheter

An ablation catheter employing one or more manifold arrangements to convey a conductive fluid medium to a target tissue. The manifold includes at least one inlet port in fluid communication with a fluid supply lumen running along at least a portion of the catheter. The inlet port or ports are in fluid communication with a larger outlet port. The outlet ports provide an outlet for the fluid to flow out of the catheter and against the target tissue. As such, the combination of at least the inlet port with the outlet port provides a flow path for fluid within the fluid lumen to flow through the manifold and to outside of the catheter. An electrode is arranged in the flow path of fluid within or adjacent the manifolds. As such, fluid may be energized and conduct ablation energy to the target tissue to ablate the tissue.

I claim:

1. An ablation catheter comprising: a tubular body associated with an ablation fluid supply lumen; at least one manifold defining at least one ablation fluid flow path out of theablation fluid supply lumen, the at least one manifold comprising: at least one inlet port in fluid communication with the ablation fluid supply lumen and arranged to provide a swirling vortex motion to an ablation fluid flowing into the at least onemanifold; at least one outlet port in fluid communication with the at least one inlet port, the at least one outlet port having a larger dimension than the at least one inlet port; and an electrode positioned in the at least one ablation fluid flowpath.

2. The ablation catheter of claim 1 wherein the at least one manifold defines a longitudinal axis, and wherein the at least one inlet port is arranged at an angle with respect to the longitudinal axis of the manifold.

3. The ablation catheter of claim 1 wherein the at least one inlet port defines a circle having a diameter of about 0.002 inches, and wherein the at least one outlet port defines a circle having a diameter of about 0.02 to about 0.025 inches.

4. The ablation catheter of claim 1 wherein the electrode is housed in an electrode lumen.

5. The ablation catheter of claim 4 wherein the electrode lumen is in communication with the at least one output port.

6. The ablation catheter of claim 1 wherein the manifold further comprises at least one channel in fluid communication with the at least one output port.

7. The ablation catheter of claim 6 wherein the at least one channel is defined in the tubular body of the catheter.

8. The ablation catheter of claim 1 wherein the catheter further comprises a shaping element, and wherein the manifold is defined in the shaping element.

9. The ablation catheter of claim 1 wherein: the tubular body includes a distal end region defining at least a partial loop; and the at least one manifold includes a plurality of manifolds along at least a portion of the at least a partialloop; and the plurality of manifolds are adapted to distribute ablation fluid within the ablation fluid supply lumen to the plurality of manifolds along the at least partial loop.

10. The ablation catheter of claim 1 wherein the tubular body defines an arcuate section.

11. An ablation catheter comprising: a tubular body associated with an ablation fluid supply lumen; at least one manifold defining at least one ablation fluid flow path out of the ablation fluid supply lumen, the at least one manifoldcomprising: an electrode positioned in the at least one ablation fluid flow path; and means for providing a swirling vortex motion in the at least one ablation fluid flow path.

12. The ablation catheter of claim 11 wherein the at least one manifold defines a longitudinal axis.

13. The ablation catheter of claim 11 wherein the electrode is housed in an electrode lumen.

14. The ablation catheter of claim 11 wherein the catheter further comprises a shaping element, and wherein the manifold is defined in the shaping element.

15. The ablation catheter of claim 11 wherein: the tubular body includes a distal end region defining at least a partial loop; and the at least one manifold includes a plurality of manifolds along at least a portion of the at least a partialloop; and the plurality of manifolds are adapted to distribute ablation fluid within the ablation fluid supply lumen to the plurality of manifolds along the at least partial loop.

16. The ablation catheter of claim 11 wherein: the tubular body defines an arcuate section.