An electrode assembly for a bi-polar ablation system comprises a first electrode array including a plurality of first tines, each of the first tines, when in a deployed configuration, extending substantially radially away from a center of the first array and including a substantially straight central portion in combination with a second electrode array including a plurality of second tines, each of the second tines, when in the deployed configuration, extending radially away from a center of the second array and including a substantially straight central portion substantially parallel to the central portion of a corresponding one of the first tines.