Multi fluid tissue resection methods and devices
Prostate treatment using fluid stream to resect prostate tissue, thereby relieving symptoms of conditions such as BPH, prostatitis, and prostatic carcinoma. A device having a fluid delivery element is positioned within a lumen of the urethra within the prostate. A fluid stream is directed outwardly from the fluid delivery element toward a wall of the urethral lumen. The fluid delivery element is moved to scan the fluid stream over the wall to remove a volume of tissue surrounding the lumen. The fluid may be combined with therapeutically active substances or with substances that increase resection efficiency. Fluid force may be adjusted to provide selective tissue resection such that soft tissue is removed while harder tissue is left undamaged. In order to gain a working space within the urethra, another fluid may be introduced to insufflate the urethra in the region of treatment.
1. A prostate resection device comprising:
a shaft having a proximal end and a distal end; and
at least one energy source positioned in an energy delivery region on the shaft for delivering energy radially outwardly;
wherein the energy source is movable relative to the shaft to selectively direct energy at different regions of the prostate and wherein the energy source is adapted to be translated, rotated, oscillated, and rotationally oscillated relative to the shaft.
2. A device as in claim 1 , wherein the at least one energy source comprises a high pressure fluid ejector comprising a nozzle.
3. A device as in claim 2 , wherein the shaft is configured to be positioned within a urethra, the device further comprising a lumen in the shaft for pressurizing the urethra surrounding the energy source to expand the urethra to space tissue away from the nozzle.
4. A device as in claim 3 , further comprising a lumen in the shaft for aspirating the urethra surrounding the nozzle to remove ablation products.
5. A device as in claim 4 , further comprising a lumen in the shaft for flushing the urethra with a fluid to help remove the ablation products.
6. A device as in claim 1 , wherein the shaft has a width in the range from 1 mm to 10 mm and a length in the range from 15 cm to 25 cm.
7. A device as in claim 1 wherein the energy source comprises a laser energy source.
8. A device as in claim 7 , wherein the energy source further comprises a mirror for reflecting the laser energy.
9. A device as in claim 1 wherein the energy source comprises a conductive fluid source and a radio frequency energy source.
10. A device as in claim 1 wherein the energy source comprises an electrode that can be positioned against the urethral wall.
11. A device as in claim 1 , further comprising an expandable anchor.
12. A device as in claim 11 , wherein the expandable anchor comprises a balloon adapted to expand in the bladder.