Circuit for controlling arc energy from an electrosurgical generator

• US 7,824,400 B2
• Filed: 03/03/2006
• Issued: 11/02/2010
• Est. Priority Date: 12/10/2002
• Status: Expired due to Fees

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Keppel, David S.
• Primary Examiner(s): GIBSON, ROY DEAN
• Application Number:
  US11/367,514
• Publication Number:
  US 20060178664A1
• Time in Patent Office: 1,705 Days
• Field of Search: 606/34, 606/38, 606/39, 606/40, 606/41, 606/46, 606/49, 323/302, 323/911
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/1213 creating an arc

Abstract

A circuit is disclosed which minimizes the amount of tissue vaporized during a first half (positive half cycle) of an electrosurgical current cycle and minimizes the amount of current applied to tissue during a second half (negative half cycle) of the electrosurgical current cycle to control thermal spread. The circuit is preferably provided within an electrosurgical generator which is capable of controlling the amount of energy delivered to a patient during electrosurgery on a per arc basis.

Claims

1. A circuit for controlling arc energy from an electrosurgical generator, said circuit comprising:

a diode-resistor block configured in series with an output current generated by an electrosurgical generator, said diode-resistor block configured to limit the amount of output current for at least one half cycle of the output current wherein said diode-resistor block is connected in series with tissue and includes a pair of diodes biased opposite from each other for splitting the output current into two paths, wherein each of the two paths includes one of a resistor and a potentiometer in series with a respective diode of the pair of diodes.

2. A circuit according to claim 1, wherein said diode-resistor block is connected in parallel with said output current generated by the electrosurgical generator.

3. A circuit for controlling arc energy from an electrosurgical generator, said circuit comprising:

means for receiving an output current generated by an electrosurgical generator;

a diode-resistor block electrically connected to said means for receiving the output current, said diode-resistor block configured to limit the amount of output current for at least one half cycle of the output current, wherein said diode-resistor block is connected in parallel with tissue and includes a pair of diodes biased opposite from each other for splitting the output current into two paths, wherein each of the two paths includes one of a resistor and a potentiometer in series with a respective diode of the pair of diodes.

4. A current according to claim 3, wherein said diode-resistor block is connected in series to said means for receiving the output current.

5. A circuit according to claim 3, wherein said diode-resistor block is connected in parallel with said means for receiving the output current.