Methods and devices for treating pelvic conditions
View Patent ↗A device and method that provides a minimally-invasive approach to performing treatments on soft tissue, such as that found in the bladder. The device is useful for manipulating tissue such that treatment tools can be inserted into the tissue at a controlled depth. In some implementations, the device and method described herein are suited to provide therapy to non-mucosal target tissue (or a target volume of tissue) to modulate bladder function. In an example, energy can be delivered to denervate selected portions of the bladder, such as afferent nerves.
1. An ablation instrument for insertion into a body cavity, comprising:
an elongate shaft including at least one cannula channel and a scope channel;
an electrode slidably associated with one of the at least one cannula channels and being slidable between a first position and a second position, wherein in the first position, a distal end of the electrode is contained within the associated cannula channel and wherein in the second position, the distal end of the electrode extends from a distal end of the associated cannula channel;
a distal head for engaging tissue; and
a positioning feature associated with the distal head, wherein said positioning feature facilitates a visual reference between the distal head and an anatomical feature as seen through a scope deployed through the scope channel,
wherein said positioning feature comprises a hoop extending from a distal end of the distal head, and
wherein said hoop is sized such that when placed over an ostium of a bladder, the ostium is viewable through the hoop.
2. The ablation instrument of claim 1 , wherein said distal head and said elongate shaft are sized and shaped for insertion into a urethra of a human patient.
3. The ablation instrument of claim 1 , further comprising a scope slidably associated with said scope channel.
4. The ablation instrument of claim 1 , wherein the elongate shaft defines a suction channel.
5. The ablation instrument of claim 4 , wherein the distal head comprises a plurality of suction apertures arranged to hold tissue when suction is applied.
6. The ablation instrument of claim 5 , wherein the distal head further comprises a flat face and an angled face, each of the faces defining at least one of the plurality of suction apertures.
7. The ablation instrument of claim 6 , wherein the suction channel is in fluid communication with the plurality of suction apertures, and wherein the ablation instrument further comprises a baffle member located in the suction channel as a barrier between: (i) a portion of the suction channel adjacent the flat face and (ii) a portion of the suction channel adjacent the angled face.
8. The ablation instrument of claim 4 , wherein the distal head comprises a suction face defining a plurality of suction apertures, and wherein the scope channel extends at a non-zero angle α to the suction face.
9. The ablation instrument of claim 8 wherein said scope channel and said cannula channel are oriented such that said angle α results in an increased separation between a scope and the suction face when the scope is advanced from a distal opening of the scope channel.
10. The ablation instrument of claim 8 wherein said angle α is within a range of 1-20 degrees.
11. The ablation instrument of claim 8 wherein said angle α is within a range of 5-15 degrees.
12. The ablation instrument of claim 8 , wherein the plurality of suction apertures are arranged to hold tissue when suction is applied.
13. The ablation instrument of claim 12 wherein the distal head further comprises an angled face defining at least one suction aperture.
14. The ablation instrument of claim 1 , further comprising a handle assembly attached to the elongate shaft, and wherein the handle assembly includes a sliding mechanism shaped to receive and manipulate a scope.
15. The ablation instrument of claim 14 , wherein the sliding mechanism includes a cutout that receives a feature on a scope such that rotation of the scope relative to the instrument is prevented when the feature is in the cutout.
16. The ablation instrument of claim 14 , wherein the sliding mechanism defines a portion of the scope channel and is slidable to manipulate a longitudinal position of a scope relative to the instrument between: (i) a distal position in which a distal end of the scope is distal of a distal end of the distal head and (ii) a retracted position in which the distal end of the scope is within the scope channel.
17. The ablation instrument of claim 16 , wherein the sliding mechanism includes a stop member slidingly positioned within a groove defined by the handle assembly, wherein the groove includes a proximal end and a distal end, wherein the distal position is established by the stop mechanism contacting the distal end of the groove, and wherein the retracted position is established by the stop mechanism contacting the proximal end of the groove.
18. The ablation instrument of claim 14 , wherein the sliding mechanism includes a stop member slidingly positioned within a groove defined by the handle assembly.
19. The ablation instrument of claim 1 , wherein said positioning feature and said electrode are constructed and arranged such that when said positioning feature is aligned with a bladder ostium, the electrode extended from the distal end of the associated cannula channel can enter tissue proximal the ostium but not enter ostial tissue.