RF energy enabled tissue debridement device

Patent metadata

Field	Value
Publication number	US-11944371-B2
Application number	US-202117553883-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Feb 18, 2015
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A bipolar electrosurgical device including an outer shaft, an inner shaft, first and second electrode surfaces, and an irrigation channel. The outer shaft defines a lumen, a proximal end and a distal end forming a cutting window. The inner shaft is rotatably disposed within the outer shaft, and defines a distal portion forming a cutting tip. The cutting tip and the cutting window combine to define a cutting implement. The first and second electrode surfaces are electrically isolated, and are formed at the cutting implement. The irrigation channel extends parallel to the outer shaft, and terminates in at least one outlet port. The outlet port is proximally spaced from the cutting window and is located radially outside of the outer shaft. Fluid (e.g., saline) is emitted at the exterior surface of the device near the cutting window and is readily present for interacting with the electrode surfaces.

First claim

What is claimed is:

1. A bipolar electrical device, comprising:
an outer shaft defining a lumen extending along a central axis, a proximal end and a distal end opposite the proximal end, in which the distal end forms a cutting window open to the lumen;
an inner shaft rotatably disposed within the lumen of the outer shaft about the central axis, the inner shaft defining a distal portion forming a cutting tip, the cutting tip and the cutting window together defining a cutting implement;
first and second electrically isolated electrode surfaces formed at the cutting implement and defining a space between each other; and
an irrigation channel within the space, the irrigation channel extending along the outer shaft and terminating in at least one outlet port proximally spaced from the cutting window and radially spaced relative to the outer shaft.

2. The device of claim 1 , in which at least one of the first and second electrically isolated electrode surfaces is defined by an electrode body having a shape selected from the group consisting of cylindrical and ring-shaped.

3. The device of claim 1 , in which the outer shaft serves as a first electrode body defining the first electrically isolated electrode surface.

4. The device of claim 3 , further comprising a second electrode body connected to the outer shaft and defining the second electrically isolated electrode surface.

5. The device of claim 4 , further comprising an electrical insulator disposed over the outer shaft to electrically isolate the outer shaft and the second electrode body.

6. The device of claim 5 , in which at least a portion of the cutting window is free of the electrical insulator to define at least a portion of the first electrically isolated electrode surf ace.

7. The device of claim 6 , further comprising an insulating layer disposed about the second electrode body and the outer shaft.

8. The device of claim 7 , in which at least a portion of the second electrode body is free of the insulating layer to form the second electrically isolated electrode surface.

9. The device of claim 1 , further comprising an electrical insulator disposed over the outer shaft, in which a region of the outer shaft is free of the electrical insulator to define the first electrically isolated electrode surface, and further in which the at least one outlet port includes a hole formed through a thickness of the electrical insulator.

10. The device of claim 9 , in which the hole formed in the outer shaft is aligned with the hole formed through the thickness of the electrical insulator.

11. The device of claim 9 , further comprising a second electrode body at least partially surrounding the outer shaft, and an insulating layer disposed about the second electrode body and the outer shaft, and further in which the at least one outlet port includes a hole formed through a thickness of the insulating layer.

12. The device of claim 11 , in which the hole formed in the outer shaft, the hole formed through the thickness of the electrical insulator and the hole formed through the thickness of the insulating layer are aligned.

13. The device of claim 1 , further comprising an electrical insulator applied to the outer shaft and a second electrode body connected to the outer shaft and defining the second electrically isolated electrode surface, in which the at least one outlet port includes a hole formed through a thickness of the outer shaft, and the irrigation channel is defined between an outer surface of the electrical insulator and an inner surface of the second electrode body.

14. The device of claim 13 , in which the second electrode body includes an inner layer formed of an electrically non-conductive material and an outer layer formed of an electrically conductive material.

15. The device of claim 14 , in which the second electrode body defines the second electrically isolated electrode surface, and at least one outlet port does not include a hole through the second electrode body.

16. The device of claim 1 , further comprising an electrical insulator applied over the outer shaft, and further in which the irrigation channel is defined by an inner surface of the electrical insulator and the outer surface of the outer shaft.

Assignees

• Medtronic Xomed Inc

Inventors

• Prisco John R
• Detmers Eric P
• Li Wenjeng
• Little David J
• Richart Patrick
• Valdez Jose

Classifications

• A61B18/1485 Primary

  having a short rigid shaft for accessing the inner body through natural openings · CPC title

• A61B17/32002

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B18/148 Primary

  having a short, rigid shaft for accessing the inner body transcutaneously, e.g. for neurosurgery or arthroscopy · CPC title

• A61B17/320783

  through side-hole, e.g. sliding or rotating cutter inside catheter · CPC title

• A61B2018/00083

  low, i.e. electrically insulating · CPC title