Method and Apparatus for Precisely Controlling the Size and Shape of Radiofrequency Ablations

A system comprising:

• an RF generator, and
• a controller for multiple independent RF switch control,
• wherein the controller is configured for repeating and/or reconfiguring a network topology of a number N of RF switch connections, SW1 to SWN, to a target at N target nodes for RF current flowing in a predetermined pattern, within a cycle and subsequent cycles by operably maintaining or changing connections to a plurality of electrodes to respond to temperature and heating requirements of any of the one or more electrodes at any instant;
• and wherein changing the connections causes RF current to flow in another predetermined pattern,
• wherein at least one of the plurality of electrodes is connected to excitation voltage of the RF generator and two or more of the remaining two or more electrodes of the plurality of electrodes are combined to form a low impedance return path electrode for the RF current.