Expandable probe

1. An expandable probe comprising:

an elongate shaft having a proximal portion, a distal portion, a lumen extending at least partially therethrough and a longitudinal axis; and

an arm operably connected to the distal portion, the arm having a first surface comprising an electrode extending over at least a portion of the first surface; the electrode being operably connectable to an energy source;

wherein the arm comprises a closed configuration and an expanded configuration, the arm in the closed configuration extends substantially parallel to the longitudinal axis and in the expanded configuration the arm extends away from the longitudinal axis, the electrode is energizable in the closed configuration and the expanded configuration of the arm.

2. The expandable probe of claim 1 , wherein the arm extends at about 90° from the longitudinal axis.

3. The expandable probe of claim 1 , wherein the arm extends less than about 90° from the longitudinal axis.

4. The expandable probe of claim 1 , further comprising a pair of arms, each arm comprising at least one electrode.

5. The expandable probe of claim 4 , wherein the arms are independently extendable away from the longitudinal axis.

6. The expandable probe of claim 5 , wherein one arm is in the expanded configuration and one arm is in the closed configuration for delivery of energy to the tissue source.

7. The expandable probe of claim 1 , further comprising a control wire operably connected to the arm for moving the arm to the expanded and closed configurations.

8. The expandable probe of claim 1 , wherein the arm comprises a second surface comprising an electrode extending over at least a portion of the second surface.

9. The expandable probe of claim 1 , further comprising a hinge member operably connected to the shaft and to the arm.

10. The expandable probe of claim 1 , further comprising a flush port operably connected to the lumen.

11. The expandable probe of claim 1 , wherein the electrode comprises bipolar electrodes.

12. The expandable probe of claim 1 , wherein the arm comprises a transparent material or a translucent material.

13. The expandable probe of claim 1 , wherein the arm comprises an energy transmitting material.

14. The expandable probe of claim 1 , further comprising an energy source wherein the energy source comprises RF energy.

15. The ablation probe of claim 1 , further comprising an endoscope, the ablation probe being deliverable through a working channel of the endoscope to the tissue site.

16. A method of delivering energy to a tissue site within a patient's lumen, the method comprising:

positioning an ablation probe within a patient's lumen, the ablation probe comprising:

an elongate shaft having a proximal portion, a distal portion, a lumen extending at least partially therethrough and a longitudinal axis; and

an arm operably connected to the distal portion, the arm having a first surface comprising an electrode extending over at least a portion of the first surface; the electrode being operably connectable to an energy source and energizable in an expanded configuration and in a closed configuration of the arm;

supplying energy to the electrode; and

ablating the tissue with the arm in the expanded configuration or the closed configuration.

17. The method of claim 16 , further comprising expanding the arm away from the longitudinal axis to the expanded configuration.

18. The method of claim 17 , further comprising moving the arm to the closed configuration and repositioning the expandable probe at a second tissue site to be treated.

19. The method of claim 18 , further comprising expanding the arm away from the longitudinal axis to the expanded configuration.

20. The method of claim 16 , further comprising flushing the tissue through a flush port on the ablation probe.