Electrosurgical devices having sesquipolar electrode structures incorporated therein

• US 3,987,795 A
• Filed: 08/28/1974
• Issued: 10/26/1976
• Est. Priority Date: 08/28/1974
• Status: Expired due to Term

• Current Assignee: Valleylab Inc. (Medtronic Plc)
• Original Assignee: Valleylab Inc. (Medtronic Plc)
• Inventors: Morrison, Charles F.
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Cohen, Lee S.
• Application Number:
  US05/501,224
• Time in Patent Office: 790 Days
• Field of Search: 128/303.14, 128/303.15, 128/303.16, 128/303.17, 128/303.13, 128/404, 128/405, 128/407-409
• US Class Current: 606/48
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2018/1475 Electrodes retractable in or deployable from a housing
• CPC Class Codes: A61N 1/04 Electrodes electrosurgical electrodes A61B18/14

Abstract

An electrosurgical device connected to an electrical generator having active and return output terminals, the device being used to cut, coagulate, or otherwise treat human tissue or the like, the device comprising: an electrode support; an active electrode responsive to the active output terminal and a return electrode responsive to the return output terminal, the electrodes being supported by the electrode support, both the electrodes being adapted for electrical connection to the tissue, the ratio of the return electrode area adapted to electrically connect to the tissue to the active electrode area adapted to ohmically or arc-wise connect to the tissue being in the range of approximately 2 to 200. Arrangements are also provided for separating the active electrode from the tissue when the device is placed in contact with the tissue to insure that a current arc is established between the active electrode and the tissue. Various electrode configurations are also disclosed.

Claims

1. An electrosurgical device adapted for connection to an electrical generator having active and return output terminals, said device being used to cut, coagulate, or otherwise treat human tissue or the like, said device comprising:

an insulative electrode support means;

an active electrode comprising at least one conductive element responsive to said active output terminal and a return electrode comprising at least one conductive element responsive to said return output terminal, said electrodes being supported by said electrode support means, the entirety of said return electrode being asymmetrically disposed with respect to said one element of said active electrode, said active and return electrodes being rigidly supported a fixed distance apart by said electrode support means, both said electrodes being adapted for electrical connection to said tissue, the ratio of the return electrode area adapted to electrically connect to said tissue to the active electrode area adapted to electrically connect to said tissue being in the range of approximately 2 to 200; and

means for connecting said active electrode to said active output terminal and said return electrode to said return output terminal

whereby said electrosurgical device can be used for cutting of said tissue due to said entirety of said return electrode being asymmetrically disposed with respect to said one active electrode element.

2. An electrosurgical device as in claim 1 where said area range is approximately 3 to 50.

3. An electrosurgical device as in claim 1 where said electrode support means includes a handle and a single tissue contacting structure disposed at one end of said handle and supporting said electrodes.

4. An electrosurgical device as in claim 3 where said active and return electrodes each comprise a single element, the size of said return electrode element being greater than that of said active electrode element.

5. An electrosurgical device as in claim 4 where said active and return electrode areas are both circular and are disposed at opposite sides of said structure.

6. An electrosurgical device as in claim 4 where said active electrode area is circular and disposed at one side of said structure and said return electrode area is U-shaped and disposed at the side of said structure opposite said one side.

7. An electrosurgical device as in claim 3 where at least one of said active and return electrodes comprises a plurality of elements.

8. An electrosurgical device as in claim 7 where both said active and return electrodes comprise a plurality of elements of equal size, the number of return electrode elements being greater than that of the active electrode elements.