Electrosurgical system and method for treating chronic wound tissue

• US 8,876,746 B2
• Filed: 04/27/2009
• Issued: 11/04/2014
• Est. Priority Date: 01/06/2006
• Status: Expired due to Fees

• Current Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Original Assignee: ArthroCare Corporation (Smith & Nephew PLC)
• Inventors: Davison, Terry S., Warne, Brian, Kwende, Martin
• Primary Examiner(s): Sirmons, Kevin C
• Assistant Examiner(s): Hall, Deanna K
• Application Number:
  US12/430,181
• Publication Number:
  US 20090209958A1
• Time in Patent Office: 2,017 Days
• Field of Search: 604/22, 606/41, 606/45, 606/49, 606/50
• US Class Current: 604/22
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/1213 creating an arc
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2218/007 Aspiration

Abstract

An electrosurgical method for treating chronic wound tissue, comprising: positioning an active electrode in close proximity to the chronic wound, the active electrode being disposed on a distal end of an electrosurgical shaft; applying a high-frequency voltage potential difference across the active electrode and a return electrode sufficient to develop a high electric field intensity associated with a vapor layer proximate the active electrode and in close proximity to the wound tissue; and stimulating an expression of at least one healing mediator.

Claims

1. An electrosurgical method of treating a chronic wound tissue comprising:

positioning an active electrode in proximity to the chronic wound tissue and a wound bed;

delivering an electrically conductive fluid proximate the active electrode; and

applying a high frequency voltage between the active electrode and a return electrode in the presence of the electrically conductive liquid sufficient to generate an ionized vapor layer at the active electrode; and

modifying the chronic wound tissue and the wound bed so as to stimulate healthy tissue growth and promote healing of the wound bed, comprising the steps of;

removing at least a substantial portion of the chronic wound tissue in a substantially non-thermal manner by application of the ionized vapor layer to the chronic wound tissue while leaving the wound bed intact, wherein the step of removing the chronic wound tissue while leaving the wound bed intact induces an altering of an inflammatory response in the wound bed; and

sterilizing at least a portion of the intact wound bed while applying the ionized vapor layer; and

then

removing at least a discrete pattern area of the wound bed with the ionized vapor layer so as to induce blood flow from the tissue underlying the wound bed.

2. The method of claim 1, wherein altering the inflammatory response comprises stimulating an expression of interleukin (IL)-8.

3. The method of claim 1, wherein removing at least a substantial portion of the chronic wound tissue further comprises debriding the at least substantial portion of the chronic wound tissue and a chronic wound tissue border.

4. The method of claim 3, further comprising removing tissue to a controlled depth to form a bleeding wound bed.

5. The method of claim 3, further comprising removing tissue to a controlled depth to form a modified chronic wound tissue surface having a substantially non-necrotic tissue surface.

6. The method of claim 3, further comprising removing necrotic tissue in the intact wound bed and in the vicinity of the chronic wound tissue.

7. The method of claim 3, further comprising removing debris in the intact wound bed and in the vicinity of the chronic wound tissue.

8. The method of claim 3, wherein sterilizing at least a portion of the intact wound bed further comprises removing pathogens in the intact wound bed and in the vicinity of the chronic wound tissue.

9. The method of claim 3, wherein sterilizing at least a portion of the intact wound bed further comprises removing biofilm in the intact wound bed and in the vicinity of the chronic wound tissue.

10. The method of claim 3, wherein sterilizing at least a portion of the intact wound bed further comprises removing bacteria in the intact wound bed and in the vicinity of the chronic wound tissue.

11. The method of claim 1 wherein removing at least a discrete pattern area of the wound bed comprises forming a perforation or a series of perforations across the wound bed.