Electrosurgical medical system and method

• US 8,475,446 B2
• Filed: 07/09/2012
• Issued: 07/02/2013
• Est. Priority Date: 12/28/2000
• Status: Expired due to Fees

• Current Assignee: Senorx Incorporated (Becton, Dickinson & Co)
• Original Assignee: Senorx Incorporated (Becton, Dickinson & Co)
• Inventors: Daw, Derek, Dabney, James Huntington
• Primary Examiner(s): Peffley, Michael
• Assistant Examiner(s): GOOD, SAMANTHA M
• Application Number:
  US13/544,288
• Publication Number:
  US 20120277739A1
• Time in Patent Office: 358 Days
• Field of Search: 606/32, 606 34- 40
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00726 Duty cycle
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/00946 slidable
• CPC Class Codes: A61B 2018/1286 having a specific transformer

Abstract

A method for mitigating leakage in an RF electrosurgical generator includes delivering an RF signal from an RF electrosurgical generator to an electrosurgical electrode by way of a patient box; providing a balanced and symmetrical shielded transmission line coupling said electrosurgical generator disposed in a first housing to said patient box disposed in a second, different housing; providing a common mode choke in said patient box, said common mode choke including an output winding and a return winding, said output winding and said return winding spaced apart and in parallel to maintain a desired impedance, said output winding comprising a wire carrying said RF signal as an output signal and said return winding carrying a return signal from a return electrode; and directing a common mode signal from said RF signal to said common mode choke thereby blocking said common mode signal.

Claims

1. A method for mitigating leakage in an RF electrosurgical generator, comprising:

delivering an RF signal from an RF electrosurgical generator to an electrosurgical electrode by way of a patient box, said RF electrosurgical generator including an RF amplifier;

providing a balanced and symmetrical shielded transmission line coupling said RF electrosurgical generator disposed in a first housing to said patient box disposed in a second, different housing;

providing a common mode choke in said patient box, said common mode choke including an output winding and a return winding, each of said output winding and said return winding wound about a ferrite core, said output winding and said return winding spaced apart and in parallel to maintain a desired impedance, said output winding comprising a wire carrying said RF signal as an output signal and said return winding comprising a duality of intertwined wires carrying a return signal from a return electrode, each of said output winding and said return winding having adjacent ribs spaced apart; and

directing a common mode signal from said RF signal to said common mode choke thereby blocking said common mode signal.

2. The method as in claim 1, further comprising arranging circuits of control and telemetry signals to be substantially symmetrical, in said patient box.

3. The method as in claim 1, further comprising;

providing an external control for sending a cut signal and a coagulate signal to said RF electrosurgical generator; and

sending at least one of said cut signal and said coagulate signal from an operable mechanical input to said RF generator via a fiber optic cable.

4. The method as in claim 1, wherein said delivering said RF signal comprises delivering a signal having a frequency of about 5 MHz.

5. The method as in claim 1, wherein said balanced and symmetrical shielded transmission line causes positive and negative portions of said RF signal to cancel and delivers said RF signal from said patient box to said electrosurgical electrode via a cable portion that has a length of at least 3 meters.