Patent ID: 8388615

Claim:
An electrosurgical device comprising: a plurality of electrodes arranged to form a tissue treatment surface, the plurality of electrodes comprising a first pair of electrodes and a second pair of electrodes, the first pair of electrodes including a first electrode and a second electrode and the second pair of electrodes including a third electrode and a fourth electrode; a power supply configured to: deliver a first drive signal to the first pair of electrodes and deliver a second drive signal to the second pair of electrodes such that: an electric field extends from the tissue treatment surface, the first drive signal is delivered to the first electrode with a first phase and to the second electrode with a second phase that is out of phase from the first phase by a first phase difference, and the second drive signal is delivered to the third electrode with a third phase and to the fourth electrode with a fourth phase that is out of phase from the third phase by a second phase difference, the first phase and the third phase being different; receive an input from an operator of the electrosurgical device; and in response to the input from the operator, adjust the first phase and the second phase such that an aspect of the electric field extending from the tissue treatment surface changes, wherein the power supply is configured to maintain the first phase difference between the adjusted first phase and adjusted second phase when adjusting the first phase and the second phase.