Electrosurgery irrigation primer systems and methods

• US 8,372,067 B2
• Filed: 12/09/2009
• Issued: 02/12/2013
• Est. Priority Date: 12/09/2009
• Status: Active Grant

• Current Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Original Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Inventors: Woloszko, Jean, Marion, Duane W.
• Primary Examiner(s): Dvorak, Linda
• Assistant Examiner(s): DELLA, JAYMI E
• Application Number:
  US12/633,916
• Publication Number:
  US 20110137308A1
• Time in Patent Office: 1,161 Days
• Field of Search: 606/38
• US Class Current: 606/34
• CPC Class Codes: A61B 18/042 using additional gas becoming plasma
• CPC Class Codes: A61B 18/1485 having a short rigid shaft for accessing the inner body through natural openings
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00827 Current
• 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 2218/005 using gas or vapor, e.g. for protection or purging

Abstract

Systems and methods are provided for priming or purging an electrosurgical fluid irrigation system. The electrosurgical system can include a high frequency power supply, a fluid delivery system, a handheld device having one or more electrodes, and one or more connectors for connecting the handheld device to the fluid delivery system and the RF generator. The electrosurgical system may be configured to deliver RF current and irrigation fluid until a threshold current level is detected, which is indicative of a continuous flow of fluid at the electrode and purging completion. The systems and methods of purging an electrosurgical system may further include dynamically controlling an RF output and fluid delivery system in accordance with varied parameters of detected threshold current levels.

Claims

1. A method of purging an electrosurgical system comprising:

activating a radiofrequency (RF) output at a level that does not cause heating or damage to a patient or user in the event of unintended contact;

activating a fluid delivery system for delivering an electrically conductive irrigation fluid to an active electrode and a return electrode;

monitoring current between the active electrode and the return electrode;

detecting a threshold current level indicative of the presence of a sufficient amount of the electrically conductive irrigation fluid adjacent the active electrode and the return electrode; and

causing the RF output and fluid delivery system to deactivate.

2. The method of claim 1, wherein the threshold current level is greater than about 50 mA.

3. The method of claim 2, wherein subsequent to detecting the threshold current level, a fluid flow rate is reduced.

4. The method of claim 3, further comprising:

detecting the threshold current level a predetermined number of times; and

counting a number of threshold current level events wherein the threshold current level is greater than about 70 mA.

5. The method of claim 1, wherein the threshold current level is greater than about 70 mA.

6. The method of claim 1, wherein the RF output is pulsed such that the RF output is delivered for about 50 ms every one second, thereby reducing a patient'"'"'s or user'"'"'s exposure to the RF output.

7. The method of claim 4, wherein the number of threshold current level events counted is at least three prior to completion of purging.

8. The method of claim 1, further comprising running a series of equipment checks, wherein the method of purging aborts if an equipment check fails.

9. The method of claim 1, wherein the method steps repeat if a threshold current level is not detected.

10. The method of claim 1, wherein the RF output level is less than about 25 VRMS.

11. The method of claim 1, wherein the RF output is continuously activated.

12. The method of claim 1, wherein the RF output is pulsed.

13. The method of claim 1, wherein the fluid delivery system is continuously activated and the RF output is pulsed for a predetermined period of time sufficient to measure current between the active and return electrodes.

14. A method of regulating an electrosurgical system to ensure that an electrically conductive fluid is continuously present at a set of treatment electrodes during a surgical procedure comprising:

activating a radiofrequency (RF) output of the electrosurgical system, wherein the RF output does not cause heating or damage to a tissue;

monitoring current between the set of treatment electrodes, wherein the set of treatment electrodes comprises an active electrode and a return electrode;

monitoring a fluid flow rate of the electrically conductive fluid at the set of treatment electrodes;

automatically adjusting the fluid flow rate in response to a detected change in current level; and

tracking a number of instances where the detected change in current level exceeds a threshold current level to determine whether the electrosurgical system is primed with the electrically conductive fluid.

15. The method of claim 14, wherein adjusting the fluid flow rate comprises increasing the fluid flow rate in response to a decrease in current level.

16. The method of claim 14, wherein the current is an RF current and further comprising deactivating the RF current if the threshold current level is not detected after adjusting the fluid flow rate.

17. The method of claim 16, further comprising generating an alert to a user signaling deactivation of the RF current.

18. The method of claim 14, wherein adjusting the fluid flow rate comprises decreasing the fluid flow rate in response to an increase in current level.

19. The method of claim 14, wherein the threshold current level is indicative of the presence of a continuous flow of the electrically conductive fluid at the set of treatment electrodes.

20. The method of claim 14, wherein the RF output is pulsed.