Ablation Device with Sensor

An electrosurgical device having a distal tip for creating a lesion on tissue, the electrosurgical device comprising:

• a first pole electrode on the distal tip for the delivery of RF energy to tissue;
• a second pole electrode on the distal tip parallel to and spaced away from the first electrode a first distance, the second pole electrode for the delivery of RF energy to tissue;
• and
• a sensor electrode on the distal tip parallel to and spaced away from the first pole electrode a second distance, wherein when the sensor electrode and at least one of the first pole electrode and the second pole electrode are in contact with tissue, the sensor electrode enables a sensor to sense at least one selected from the group of voltage, tissue impedance, electrical conduction, conduction time, conduction velocity, and signal phase angle.