Combination electrosurgical and mechanical resection device
A combination medical device for removing and treating tissue in a patient is disclosed. The device includes a reusable handle and a blade selectively connectable to the handle. The blade includes an outer sleeve having a lumen with an inner shaft disposed therein. The inner shaft may be coupled to a motor drive unit disposed within the handle and may rotate so as to mechanically cut tissue as the inner shaft rotates. The outer sleeve includes at least one electrode for electrosurgically treating tissue. The reusable handle includes at least one control switch for controlling a parameter associated with the rotation of the inner shaft. The blade also may include a switch assembly in electrical communication with the at least one electrode, the switch assembly including attachment means for selective attachment of the switch assembly to the reusable handle.
1. A combination medical device for removing and treating tissue in a patient, comprising:
a handle portion and a blade portion, the blade portion comprising an outer sleeve having a lumen with an inner shaft disposed therein, the outer sleeve having a window with a cutting edge, configured to mechanically cut tissue when the inner shaft rotates;
wherein the outer sleeve defines an exposed electrically conductive portion with a lateral opening therethough, the lateral opening circumferentially spaced from and coextensive with the window, the exposed electrically conductive portion defining a return electrode; and
wherein a dielectric spacer is coupled to the outer sleeve and extends through the lateral opening; and wherein the dielectric spacer includes a cavity that nests an active electrode and electrically isolates the active electrode from the return electrode.
2. The combination medical device of claim 1 wherein the dielectric spacer is a ceramic.
3. The combination medical device of claim 1 wherein the lateral opening defines a peripheral edge having a plurality of retention elements, configured to integrate with cooperating retention elements on the dielectric spacer.
4. The combination medical device of claim 1 wherein the dielectric spacer further comprises a circumferential overhang for partially wrapping around an outer surface of the outer sleeve.
5. The combination medical device of claim 1 wherein the inner shaft has a lumen that forms part of a fluid aspiration element, configured to remove tissue drawn through the window while mechanically resecting tissue and also configured to remove fluid and plasma by-products drawn through the active electrode while the device electrosurgically treats tissue.
6. The combination medical device of claim 1 wherein the active electrode has an aspiration opening therethrough for removing fluid and tissue debris.
7. The combination medical device of claim 1 wherein the blade portion further comprises an electrical switch assembly in electrical communication with the active electrode, the switch including attachment means for selective attachment of the switch assembly to a desired location on the handle portion.
8. The combination medical device of claim 7 wherein the switch assembly comprises a flexible substrate having first and second opposing sides, a button on the second side of the flexible substrate, and an electrically conductive element operably connected to said button for selectively coupling the at least one electrode with an output of an electrosurgical generator.
9. The combination medical device of claim 7 wherein the switch assembly attachment means is selected from the group consisting of an adhesive, a clip, a sleeve, a wrap.
10. The combination medical device of claim 1 wherein the dielectric spacer defines an aspiration aperture that extends through the lateral opening.
11. The combination medical device of claim 10 wherein the active electrode defines an aspiration aperture that is in fluid communication with the dielectric spacer aspiration aperture.
12. The combination medical device of claim 11 wherein the active electrode aspiration aperture is coextensive with a window of the inner shaft.
13. The combination medical device of claim 1 wherein the dielectric spacer includes a boss defining an aspiration opening, the boss configured to increase a distance between the active electrode and an internal surface of the return electrode.
14. The combination medical device of claim 1 wherein the lateral opening is circumferentially offset and radially opposite the window.
15. The combination medical device of claim 1 wherein the window is on a first side of the outer sleeve and the active electrode is disposed on a second side of the outer sleeve, the second side opposite the first side.
16. The combination medical device of claim 1 wherein the outer sleeve is formed of an electrically conductive tube and wherein the exposed electrically conductive portion defining the return electrode is an outer surface of the electrically conductive tube.
17. The combination medical device of claim 1 wherein the dielectric spacer cavity includes bilateral overhangs configured to constrain the active electrode.
18. The combination medical device of claim 1 wherein an outer circumferential surface of the active electrode is disposed radially farther than an outer circumferential surface of the return electrode.
19. The combination medical device of claim 1 wherein the lateral opening extends through the outer sleeve on a first circumferential side of the outer sleeve and the window extends through outer sleeve on an opposing circumferential side of the outer sleeve, and wherein the entire dielectric spacer is disposed on the first circumferential side.
20. The combination medical device of claim 1 wherein the dielectric spacer extends through the lateral opening up to the outer sleeve lumen.