Basket catheter having multiple electrodes

1. A catheter comprising:

an elongated catheter body having a proximal end and a distal end, and at least one lumen therethrough in a longitudinal direction of the elongated catheter body;

a handle connected to the proximal end of the elongated catheter body, wherein the handle is configured to deflect the distal end of the elongated catheter body;

an electrode assembly at the distal end of the catheter body, the electrode assembly comprising a plurality of spines, each of the spines having a proximal end connected to the distal end of the catheter body and a distal end, the distal ends of the spines being connected at a tip junction, wherein each spine includes an elbow, wherein the spines include a plurality of electrodes; and

a tilting mechanism to tilt the electrode assembly with respect to the elongated catheter body;

wherein the electrode assembly is sized and configured to fit in a sheath in a collapsed arrangement and is configured to expand to an expanded arrangement with the elbows of the spines bending outwardly relative to the proximal and distal ends of the spines, the elbows of the spines moving radially outwardly from the collapsed arrangement to the expanded arrangement.

2. The catheter of claim 1 , wherein the elbow of each spine has at least one discontinuity in stiffness resulting from at least one of a change in material, a change in cross-sectional arrangement, and a change in cross-sectional area.

3. The catheter of claim 1 , wherein each spine has electrodes only between the elbow and the distal end thereof or only between the elbow and the proximal end thereof.

4. The catheter of claim 1 , further comprising a bending mechanism to bend the elongated catheter body.

5. The catheter of claim 1 , wherein the spines include mapping electrodes, and wherein the tip junction includes an ablation electrode.

6. The catheter of claim 1 , wherein the spines include mapping electrodes, the electrodes in one spine being spaced differently from the electrodes in another spine.

7. The catheter of claim 1 , wherein at least one of the spines includes a shape memory material that biases the spine toward the expanded arrangement.

8. The catheter of claim 1 , wherein at least one spine has an ablation electrode disposed at the elbow thereof.

9. The catheter of claim 1 , further comprising an adjusting, member which has a distal end connected to the tip junction and a proximal end which is movable in the longitudinal direction of the elongated catheter body, wherein movement of the adjusting member changes the shape of the electrode assembly.

10. The catheter of claim 1 , wherein the tilting mechanism comprises a flat wire.

11. A catheter comprising:

an elongated catheter body having a proximal end and a distal end, and at least one lumen therethrough in a longitudinal direction of the elongated catheter body;

a handle connected to the proximal end of the elongated catheter body, wherein the handle is configured to deflect the distal end of the elongated catheter body; and

an electrode assembly at the distal end of the catheter body, the electrode assembly comprising a plurality of spines, each of the spines having a proximal end connected to the distal end of the catheter body and a distal end, the distal ends of the spines being connected at a tip junction, wherein each spine includes an elbow having at least one discontinuity in stiffness at an intermediate position between the distal end and the proximal end thereof, wherein the spines include a plurality of electrodes; and

a deflectable adjusting member which has as distal end connected to the tip junction and a proximal end which is movable in the longitudinal direction of the elongated catheter body;

wherein movement of the deflectable adjusting member in the longitudinal direction of the catheter body changes the shape of the electrode assembly between a collapsed arrangement in which the electrode assembly is sized and configured to fit within a lumen of a sheath and different expanded arrangements with the elbows of the spines bending outwardly relative to the proximal and distal ends of the spines, the elbows of the spines moving radially outwardly from the collapsed arrangement to the expanded arrangement, and wherein the deflectable adjusting member is deflectable to tilt the electrode assembly with respect to the distal end of the elongated catheter body.

12. The catheter of claim 11 , wherein the elbow of each spine has at least one discontinuity in stiffness resulting from at least one of a change in material, a change in cross-sectional arrangement, and a change in cross-sectional area.

13. The catheter of claim 11 , wherein each spine has electrodes only between the elbow and the distal end thereof.

14. The catheter of claim 11 , wherein the spines include mapping electrodes, the electrodes in one spine being spaced differently from the electrodes in another spine.

15. The catheter of claim 11 , wherein at least one spine has an ablation electrode disposed at the elbow thereof.