Devices and methods for prostate tissue ablation and/or resection

1. A medical device, comprising:

a shaft assembly, including:

a sheath having a first lumen, and a distal section having a distal opening and a side opening;

a rotatable shaft extending through the first lumen, the rotatable shaft being rotatable relative to the sheath and having a second lumen, a side opening, and a distal section extendable distally from the distal opening of the sheath; and

an electrode extending through the second lumen of the rotatable shaft, the side opening of the rotatable shaft, and radially outwardly from the rotatable shaft, the electrode being movable relative to the rotatable shaft.

2. The medical device of claim 1 , wherein the electrode includes a first section extending through the second lumen and the side opening of the rotatable shaft, and a second section extending radially outwardly from the rotatable shaft.

3. The medical device of claim 2 , wherein the first section is slidable in the second lumen and the side opening of the rotatable shaft.

4. The medical device of claim 3 , wherein proximal sliding of the first section decreases a length of the second section.

5. The medical device of claim 3 , wherein distal sliding of the first section increases a length of the second section.

6. The medical device of claim 1 , wherein at least a portion of the electrode extends through the side opening of the distal section of the sheath.

7. The medical device of claim 1 , wherein the shaft assembly includes an inner sheath extending through the second lumen.

8. The medical device of claim 7 , wherein the inner sheath has a third lumen and a side opening, the electrode extends through the third lumen and the side opening of the inner sheath, and the side opening of the rotatable shaft overlaps with the side opening of the inner sheath.

9. The medical device of claim 8 , wherein at least one of the inner sheath and the rotatable shaft is longitudinally slidable relative to the other of the inner sheath and the rotatable shaft.

10. A medical device, comprising:

a shaft assembly, including:

a sheath having a first lumen, and a distal section having a distal opening and a side opening;

a rotatable shaft extending through the first lumen, the rotatable shaft being rotatable relative to the sheath and having a second lumen, side openings, and a distal section extendable distally from the distal opening of the sheath; and

a plurality of electrodes including proximal sections extending through the second lumen and the side openings of the rotatable shaft, and distal sections extending radially outwardly from the rotatable shaft, each of the plurality of electrodes being independently movable relative to the rotatable shaft.

11. The medical device of claim 10 , wherein the proximal sections are slidable in the second lumen and the side openings, of the rotatable shaft to move the distal sections.

12. The medical device of claim 11 , wherein sliding the proximal sections proximally reduces lengths of the distal sections, and sliding the proximal sections distally increases the lengths of the distal sections.

13. The medical device of claim 10 , wherein the shaft assembly further includes an inner sheath extending through the second lumen.

14. The medical device of claim 13 , wherein the inner sheath has a third lumen and a side opening, the electrodes extend through the third lumen and exit from the third lumen through the side opening of the inner sheath, and the side openings of the rotatable shaft overlap with the side opening of the inner sheath.

15. The medical device of claim 14 , wherein each of the electrodes forms a loop.