A device for forming a lesion includes a hub defining a passageway therethrough and having a mounting structure at one end of the passageway and a shaft attached to the hub and defining lumen therethrough having a longitudinal axis. The shaft has a proximal end attached to the hub in communication with the passageway and a distal end extending away from the hub. The shaft includes an electrically conductive material on at least a portion of an inner surface and an electrically conductive material on at least a portion on an outer surface. A conductive member has a longitudinal axis and is attached to a mounting structure mateable with the mounting structure of the hub so that the conductive member extends through the passageway into the lumen so that at least near the hub the conductive member longitudinal axis is spaced from the lumen longitudinal axis, thereby assisting in creating electrical contact between the conductive member outer surface and the shaft inner surface.
