Bipolar electrosurgical forceps

• US 4,938,761 A
• Filed: 03/06/1990
• Issued: 07/03/1990
• Est. Priority Date: 03/06/1989
• Status: Expired due to Fees

• Current Assignee: Maxxim Medical, Inc. (UBS Ag)
• Original Assignee: MDT Incorporated
• Inventors: Ensslin, Frieder H.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US07/319,050
• Time in Patent Office: 119 Days
• Field of Search: 128/303.13, 128/303.14, 128/303.17, 128/303.18, 219/230, 219/241, 606/43, 606/48, 606/51, 606/52, 606/36-40
• US Class Current: 606/51
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1442 Probes having pivoting end effectors, e.g. forceps
• CPC Class Codes: A61B 2017/00097 one of the thermometric elements being an electrode or the heating element
• CPC Class Codes: A61B 2018/00654 with individual control of each of a plurality of energy emitting elements
• CPC Class Codes: A61B 2018/00797 measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple

Abstract

A bioplar electrosurgical forceps carries a thermocouple junction at the distal end of each of two mutually opposed prongs. The junctions are formed by welding a constantan wire directly to the ferrous metal prongs, thereby avoiding the need for electrical isolation.

Claims

1. An electrosurgical apparatus comprising:

an rf generator with first and second output terminals;

a hand-held forceps formed of first and second prongs, respectively, said prongs being electrically coupled to respective said terminals;

each of said prongs having a proximal end and a distal end formed of a first metal, said prongs being positioned in approximately parallel spaced alignment with their proximal ends held in fixed non-conductive relationship and their distal ends spaced from each other in opposed working relationship;

the distal ends of said prongs respectively comprising surgical contact surfaces electrically connected to said generator, and carrying a thermocouple junction between said first metal and a second metal in a groove separated from said contact surfaces;

conductors extending from respective said thermocouple junctions in mechanical association with but in non-conductive relationship with respective said prongs; and

measurement circuit means electronically associated with said conductors to detect signals from respective said junctions and to convert said signals into respective temperature measurements, said measurement circuit means being electronically isolated from said rf generator.

2. Apparatus according to claim 1 wherein each of said prongs is conductive between its proximal and distal ends and said conductors are formed of said second metal.

3. Apparatus according to claim 2 wherein said proximal ends are held by an insulating fixture.

4. Apparatus according to claim 3 wherein said prongs are made of ferrous metal and said conductors are made from constantan metal.