Method and system of controlling conductive fluid flow during an electrosurgical procedure

• US 9,801,678 B2
• Filed: 03/13/2013
• Issued: 10/31/2017
• Est. Priority Date: 03/13/2013
• Status: Active Grant

• Current Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Original Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Inventors: Cox, David A.
• Primary Examiner(s): Carey, Michael
• Assistant Examiner(s): Bays, Pamela M
• Application Number:
  US13/800,266
• Publication Number:
  US 20140276725A1
• Time in Patent Office: 1,693 Days
• Field of Search: 606 34
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/00207 with hand gesture control or hand gesture recognition
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00029 open
• CPC Class Codes: A61B 2018/00035 with return means
• CPC Class Codes: A61B 2018/00166 Multiple lumina
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/00744 Fluid flow
• CPC Class Codes: A61B 2018/0091 Handpieces of the surgical instrument or device
• CPC Class Codes: A61B 2018/00916 with means for switching or controlling the main function of the instrument or device
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2218/002 Irrigation
• CPC Class Codes: A61B 2218/007 Aspiration

Abstract

Controlling conductive fluid flow during an electrosurgical procedure. At least some of the example embodiments are methods including: flowing conductive fluid from a source lumen to a suction lumen of an electrosurgical wand, the flowing with the electrosurgical wand in a first orientation; sensing a change in orientation of the electrosurgical wand to a second orientation different than the first orientation; and changing a control parameter associated with the conductive fluid flow, the changing responsive to the change in orientation of the electrosurgical wand.

Claims

1. A method comprising:

flowing an electrically conductive fluid from at least one source lumen of an electrosurgical wand, the flowing with the electrosurgical wand in a first orientation;

sensing a change in orientation of the electrosurgical wand to a second orientation different than the first orientation, the sensing by a computer system; and

changing a control parameter associated with the electrically conductive fluid flow, the changing configured to compensate for changes in electrically conductive fluid flow from the at least one source lumen due to the change in orientation of the electrosurgical wand, and changing the control parameter by the computer system;

wherein both the step of flowing and the step of changing a control parameter associated with electrically conductive fluid flow define a flow rate configured to create plasma adjacent an active electrode of the electrosurgical wand while RF energy is supplied to the active electrode.

2. The method of claim 1 wherein sensing the change in orientation further comprises sensing using an inclinometer mechanically coupled to the electrosurgical wand, and the inclinometer communicatively coupled to the computer system.

3. The method of claim 1 wherein sensing the change in orientation further comprises sensing using a gyroscope mechanically coupled to the electrosurgical wand, and the gyroscope communicatively coupled to the computer system.

4. The method of claim 1 wherein sensing the change in orientation further comprises sensing using a three-axis gyroscope mechanically coupled to the electrosurgical wand, and the gyroscope communicatively coupled to the computer system.

5. The method of claim 1 wherein sensing the change in orientation further comprises sensing using a six-axis gyroscope mechanically coupled to the electrosurgical wand, and the gyroscope communicatively coupled to the computer system.

6. The method of claim 1 wherein changing the control parameter further comprises changing an amount of flow restriction within the flow of conductive fluid, the flow restriction between a source of the conductive fluid and the at least one source lumen.

7. The method of claim 1 wherein changing the control parameter further comprises changing a position of a valve stem of a valve by the computer system, the valve coupled within tubing between a source of conductive fluid and the at least one source lumen of the electrosurgical wand.

8. The method of claim 1 wherein changing the control parameter further comprises changing an amount of pinch applied to a portion of tubing disposed between a source of the conductive fluids and the at least one source lumen.

9. The method of claim 1, wherein the flow rate is configured to control tissue coagulation adjacent the active electrode during periods of time when RF energy is supplied to the active electrode.

10. The method of claim 1, wherein the flow rate is configured to limit fluid pooling away from the active electrode, so as to limit unintended electrosurgical tissue treatment during periods of time when RF energy is supplied to the active electrode.

11. The method of claim 1 wherein the flow rate is configured to provide adequate wetting of the active electrode, so as to limit unintended heating of the active electrode during periods of time when RF energy is supplied to the active electrode.

12. A method comprising:

flowing conductive fluid through at least one lumen on a distal end of an electrosurgical wand, while the electrosurgical wand is in a first orientation;

sensing a change in orientation of the electrosurgical wand to a second orientation different than the first orientation, the sensing by an orientation sensor coupled to a handle of the wand; and

changing a control parameter associated with the conductive fluid flow, the changing configured so as to compensate for a change in flow of the conductive fluid due to the change in orientation of the electrosurgical wand, and the changing the control parameter by a computer system in communication with the orientation sensor;

wherein both the step of flowing and the step of changing a control parameter associated with conductive fluid flow define a flow rate, configured to form and maintain a vapor layer at an active electrode of the electrosurgical wand during periods of time when RF energy is supplied to the active electrode.

13. The method of claim 12 wherein the orientation sensor is an inclinometer.

14. The method of claim 12 wherein the orientation sensor is a gyroscope.

15. The method of claim 12 wherein the orientation sensor is a three-axis gyroscope.

16. The method of claim 12 wherein the orientation sensor is a six-axis gyroscope.

17. The method of claim 12 wherein changing the control parameter further comprises changing an amount of flow restriction within the flow of conductive fluid, the flow restriction between a source of the conductive fluid and the at least one lumen.

18. The method of claim 12 wherein changing the control parameter further comprises changing a position of a valve stem of a valve by the computer system, the valve coupled within tubing between a source of conductive fluid and the at least one lumen of the electrosurgical wand.

19. The method of claim 12 wherein changing the control parameter further comprises changing an amount of pinch applied to a portion of tubing disposed between a source of the conductive fluids and the at least one lumen.

20. A method comprising:

orienting an electrosurgical wand so that a wand handle end and a wand distal end are at substantially the same elevation;

flowing conductive fluid from a source lumen disposed adjacent the wand distal end;

adjusting a flowrate of the conductive fluid to a desired flowrate;

sensing a change in elevation between the handle end and the distal end, the sensing by an orientation sensor associated with the wand and wherein the change in elevation causes a change in the flowrate away from the desired flowrate; and

changing a control parameter associated with the conductive fluid flow so as to compensate for the change in flowrate due to the change in elevation between the handle end and the distal end and return the flowrate closer to the desired flowrate

wherein both the step of flowing and the step of changing a control parameter associated with conductive fluid flow define a flow rate, configured to form and maintain a vapor layer at an active electrode of the electrosurgical wand during periods of time when RF energy is supplied to the active electrode.

21. The method of claim 20 wherein the orientation sensor is in communication with a flow control device and wherein changing the control parameter changes the restriction of the flow to the source lumen.

22. The method of claim 21 wherein when the orientation sensor senses that the handle end is lower relative to the distal end, the fluid control device decreases the restriction to the fluid flow.

23. The method of claim 21 wherein when the orientation sensor senses that the handle end is higher relative to the distal end, the fluid control device further restricts the fluid flow.