Symmetric switching electrode method and related system

• US 8,979,838 B2
• Filed: 05/24/2010
• Issued: 03/17/2015
• Est. Priority Date: 05/24/2010
• Status: Active Grant

• Current Assignee: Philip Morris USA Incorporated (Altria Group, Inc.), ArthroCare Corporation (Smith & Nephew PLC)
• Original Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Inventors: Woloszko, Jean, Goode, John, Tetzlaff, Philip M.
• Primary Examiner(s): Peffley, Michael
• Assistant Examiner(s): GIULIANI, THOMAS ANTHONY
• Application Number:
  US12/785,563
• Publication Number:
  US 20110288539A1
• Time in Patent Office: 1,758 Days
• Field of Search: 606/33, 606/34, 606/41, 606/42, 606/48, 606/50, 607/98, 607/99, 607/101, 607/115, 607/154
• US Class Current: 606/41
• CPC Class Codes: A61B 18/042 using additional gas becoming plasma
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/148 having a short, rigid shaft for accessing the inner body transcutaneously, e.g. for neurosurgery or arthroscopy
• CPC Class Codes: A61B 2018/00178 Electrical connectors
• CPC Class Codes: A61B 2018/0044 Spinal cord
• CPC Class Codes: A61B 2018/124 switching the output to different electrodes, e.g. sequentially
• CPC Class Codes: A61B 2018/144 Wire
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes

Abstract

Electrosurgical system and related methods that include: producing energy by a generator of an electrosurgical controller, the generator comprises a first terminal coupled to a first electrode of an electrosurgical wand, and the generator comprises a second terminal coupled to a second electrode of the electrosurgical wand; forming, responsive to the energy, a plasma proximate to the first electrode, while the second electrode acts as a return electrode; reducing energy output of the generator such that the plasma proximate the first electrode is extinguished, then producing energy from the generator with the first terminal coupled to the first electrode and the second terminal coupled to the second electrode; and forming, responsive to the energy, a plasma proximate to the second electrode, while the first electrode acts as a return electrode.

Claims

1. A method of operation of an electrosurgical controller comprising:

commanding the electrosurgical controller to produce an energy output by a generator of the electrosurgical controller, wherein the generator comprises a first terminal coupled to a first electrode of an electrosurgical wand, and the generator comprises a second terminal coupled to a second electrode of the electrosurgical wand, the first and second electrodes each having a substantially equal surface area;

applying the energy output across the first and second terminals without favoring delivery of the energy output to one of the first or second electrodes over the other;

forming, responsive to the energy output, a plasma proximate to the first electrode of the electrosurgical wand, thereby causing the second electrode of the electrosurgical wand to act as a return electrode; and

then

reducing the energy output of the generator such that the plasma proximate the first electrode is extinguished, the step of reducing the energy output occurring without interruption to the step of commanding the electrosurgical controller to produce the energy output; and

then

again producing the energy output by the generator and applying the energy output across the first and second terminals without favoring delivery of the energy output to one of the first or second electrodes over the other; and

forming, responsive to the energy output and in the absence of a changing command, a plasma proximate to the second electrode, thereby causing the first electrode to act as the return electrode.

2. The method of claim 1 wherein reducing the energy output further comprises turning the generator off for a predetermined period of time.

3. The method of claim 1 wherein reducing the energy output further comprises reducing the energy output for at least 20 milliseconds (ms).

4. The method of claim 3 wherein reducing the energy output further comprises reducing the energy output for 50 ms.

5. The method of claim 1 wherein producing the energy output from the generator further comprises producing the energy output for between and including 50 milliseconds (ms) and 2000 ms.

6. The method of claim 5 wherein producing the energy output from the generator further comprises producing the energy output for 500 ms.

7. The method of claim 1 wherein reducing the energy output further comprises reducing the energy output during a period of time when a foot pedal device, actuation of which indicates the step of commanding the electrosurgical controller to produce the energy output by the generator, is actuated.

8. The method of claim 1 wherein forming the plasma proximate the first electrode, and then forming the plasma proximate the second electrode, occurs in the absence of a command provided to the electrosurgical controller to change an active electrode.

9. The method of claim 1 wherein producing the energy output further comprises producing radio frequency energy.

10. The method of claim 1 wherein forming the plasma proximate to the first electrode further comprises forming the plasma proximate the first electrode, the first electrode being the electrode where the highest current density is formed.

11. The method of claim 1 wherein forming the plasma proximate to the first electrode further comprises forming the plasma proximate the first electrode, the first electrode being the electrode closest to tissue to be treated.

12. The method of claim 1, wherein the steps of producing, reducing and then again producing the energy output are performed automatically by the controller.

13. The method of claim 1, the step of again producing the energy output occurring without change or interruption to the step of commanding the electrosurgical controller.