Patent ID: 8231615

Claim:
A system for mitigating leakage in an RF electro surgical generator, comprising: an RF electrosurgical generator coupled to a patient box coupled to an electrosurgical electrode, wherein said RF electrosurgical generator is configured to generate an RF signal, said patient box is configured to receive said RF signal from said RF electrosurgical generator, and said patient box is configured to supply an RF output signal to said electrosurgical electrode; a return electrode coupled to said patient box; a balanced and symmetrical shielded transmission line that couples said RF electrosurgical generator disposed in a first housing to said patient box disposed in a second separate housing; a common mode choke disposed in said patient box, said common mode choke including an output winding and a return winding, each of said windings 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 output signal and said return winding comprising a duality of intertwined wires carrying a return signal from said return electrode, each of said windings having adjacent ribs spaced apart and each of said windings wound in opposite directions, said common mode choke being configured to receive a common mode signal from said RF output signal and block said common mode signal.