Electrosurgical lesion location device

A method of accessing a target tissue mass in the body of a patient, comprising:

• a. providing an accessing device comprising
• i. an elongate shaft having a proximal section, a distal section, a distal end and a tissue penetrating distal tip;
• ii. a first plurality of conducting members disposed in the elongated shaft and movable between a retracted position in which they are contained within the elongate shaft, and a deployed position in which they initially exit the elongated shaft toward the distal end and extend radially from the elongate shaft at a location proximal to the distal end to a first radial distance;
• iii. a first electrical conductor which is connected to at least one of the first plurality of conducting members;
• iv. a second plurality of conducting members disposed in the elongate shaft proximal and movable between a retracted position in which they are contained within the elongate shaft, and a deployed position in which they initially exit the elongated shaft toward the proximal end and extend radially from the elongate shaft at a location proximal to the distal end to a second radial distance;
• and
• v. a second electrical conductor which is connected to at least one of the second plurality of conducting members;
• b. inserting the accessing device into the patient's body and advancing the device therein until the tissue penetrating distal tip passes through the target tissue mass;
• and
• c. extending the first and second conducting members substantially radially from the elongated shaft so that the conducting members are deployed into the target tissue mass;
• and
• d. providing at least one of the first and second plurality of conducting members with high frequency electrical power when in the deployed position.