Patent ID: 7549986

Claim:
A system for treating tissue using electrical energy, comprising: a first ablation device comprising a first probe assembly comprising a cannula with a lumen therein, a shaft configured for axial movement within the lumen, and a first electrode secured to a distal end of the shaft, the probe assembly configured for insertion into the tissue at a first location; and a second ablation device comprising a second, separate probe assembly comprising a cannula with a lumen therein, a shaft configured for axial movement within the lumen, and a second electrode secured to a distal end of the shaft, the probe assembly configured for insertion into the tissue at a second location different from the first location; and a source of electrical energy having first and second terminals respectively coupled to the first and second electrodes, the first and second terminals operatively coupled to separate control circuits connected in parallel with one another, such that the first and second ablation devices are configured for substantially simultaneously creating first and second lesions at first and second sites, respectively, such that as impedance of tissue at the first site increases, the second electrode continues to deliver current to tissue at the second site.