#$%^&*AU2007200272B220121115.pdf#####DUAL SYNCHRO-RESONANT ELECTROSURGICAL APPARATUS WITH BI-DIRECTIONAL MAGNETIC COUPLING ABSTRACT An electrosurgical generator (10) is disclosed, which includes an RF output stage (30) connected to a DC power supply (28) and first and second connections (32, 34). The first connection (32) includes a first switching component (48) and a first parallel inductorcapacitor resonant circuit (45). The second connection (34) includes a second switching 5 component (50) and a second parallel inductor-capacitor resonant circuit (47). The first and second switching components (48, 50)are configured to open and close at a predetermined frequency based on a phase-correlated dual drive signal emitted by a driver and are in a 180 degree out-of-phase relationship. The first parallel inductor-capacitor resonant circuit (45) is further configured to produce a first half-sinusoidal waveform and to the second parallel inductor-capacitor resonant circuit (47) is configured to produce a second half-sin half-sinusoidal waveform. The RF output stage (30) further includes a transformer (60) having a primary winding (62) and a secondary winding (64) and a series inductor-capacitor resonant circuit (58), which are configured to generate a sinusoidal waveform.1/3 10 1 1 ELECTROSURGICAL GENERATOR 16 FIG. 1A 16 FIG. 1B
