Tissue excision, cutting, and removal systems and methods
The disclosure provides various embodiments of catheters having articulable ends that can be used for various procedures. Embodiments of methods are also provided that can be performed with catheters in accordance with the present disclosure.
1. A device to remove a plurality of valve leaflets in a single cutting operation, comprising:
an outer electrode defined by a zig-zag shaped leading edge defining a plurality of proximally facing tips to be received within the cusps of a cardiac valve, the outer electrode being configured to be disposed radially outwardly with respect to leaflets of the cardiac valve, wherein each proximally facing tip is coupled to a respective distally extending lead tube, each said lead tube including a guidewire slidably disposed therein, each said guidewire being configured to be advanced along a proximal direction out of a proximally-facing opening of each lead tube; and
an inner electrode disposed concentrically within the outer electrode, the inner electrode being defined by a zig-zag shaped leading edge complementing the zig zag shape of the leading edge of the outer electrode, the inner electrode defining a plurality of proximally facing tips, the inner electrode being configured to be received within an orifice of the cardiac valve radially inwardly with respect to the cardiac valve leaflets;
wherein the inner electrode can be rotated about a central axis with respect to the outer electrode, and further wherein, in a first mode of operation, a bipolar cutting circuit is completed by passing electrical current from one of the inner electrode and the outer electrode to the other of the inner electrode and the outer electrode.
2. The device of claim 1 , wherein the outer electrode further includes mechanical cutting edges to help cut through the tissue as the outer electrode is advanced along a proximal direction.
3. The device of claim 1 , wherein the outer electrode is surrounded by a fluid permeable shroud configured to capture particulate matter therein and permit blood flow therethrough.
4. The device of claim 1 , wherein the outer electrode and inner electrode are radially inwardly collapsible into a tubular portion of a delivery catheter, the delivery catheter being configured to deliver the outer electrode and inner electrode through a patient's vasculature to a location proximate a cardiac valve.
5. The device of claim 4 , wherein the outer electrode is formed from a radially expandable framework including the lead tubes, the zig-zag shaped leading edge, and a layer of fluid permeable material surrounding the lead tubes.
6. The device of claim 5 , wherein the zig-zag shaped leading edge of the outer electrode is formed from a conductive ring having a plurality of lengths forming the zig-zag shaped leading edge connected at hinge locations, wherein a first half of the hinge locations coincide with the proximally facing tips proximate the proximally facing end of each respective lead tube, and a second half of the hinge locations face distally, and further wherein the hinges collapse and the plurality of lengths are placed into axial alignment as the outer electrode is compressed radially inwardly to permit introduction into the tubular portion of the delivery catheter.
7. The device of claim 6 , wherein each distally facing tips of the zig-zag shaped leading edge of the outer electrode is coupled to a proximally facing end of a respective proximally extending support rod.
8. The device of claim 7 , wherein the lead tubes and the proximally extending support rods are configured to maintain axial alignment with each other and with the zig-zag shaped leading edge of the outer electrode.
9. The device of claim 1 , wherein the zig-zag shaped leading edge of the inner electrode is formed from a conductive ring having a plurality of lengths forming the zig-zag shaped leading edge connected at hinge locations, wherein a first half of the hinge locations coincide with the proximally facing tips, and a second half of the hinge locations face distally, and further wherein the hinges collapse and the plurality of lengths are placed into axial alignment as the inner electrode is compressed radially inwardly to permit introduction into the tubular portion of the delivery catheter.
10. The device of claim 9 , wherein each distally facing tip and each proximally facing tip of the zig-zag shaped leading edge of the outer electrode is coupled to a proximally facing end of a respective proximally extending support rod.
11. The device of claim 10 , wherein the proximally extending support rods are configured to maintain axial alignment with each other and with the zig-zag shaped leading edge of the inner electrode.
12. An electrosurgical system comprising the device of claim 1 operably coupled to an electrosurgical power supply, wherein, in a bipolar mode of operation, the proximally facing tips of the outer electrode are out of rotational alignment with respect to the proximally facing tips of the inner electrode about a longitudinal axis of the device.
13. The electrosurgical system of claim 12 , wherein, in a monopolar mode of operation, the proximally facing tips of the outer electrode are in rotational alignment with respect to the proximally facing tips of the inner electrode about a longitudinal axis of the device.
14. The device of claim 1 , wherein the inner electrode further includes mechanical cutting edges to help cut through the tissue as the inner electrode is advanced along a proximal direction.