| 摘要 |
An apparatus for delivering energy to a biological site includes a catheter having a plurality of electrodes, the electrodes positioned proximal the biological site. A power control system supplies power signals, each having a controllable phase angle, to each of the electrodes, such that the phase between electrodes alternates. A backplate or indifferent electrode is also positioned proximal the biological site so that the biological site is interposed between the electrode device and the backplate. The backplate is maintained at one voltage level in relation to the power. The power control system controls the phase angle of the power so that the current flow between the electrodes and between the electrodes and the backplate results in the continuity and depth of lesions desired. In a preferred embodiment, the electrodes are arranged in a substantially linear array. The duty cycle of each electrode is controlled and during the off period of the duty cycle, the phase angles of adjacent electrodes are alternated to achieve a more uniform ablation volume.
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