Abstract: A catheter includes an elongated body, a distal assembly with a shape-memory member defining a generally circular form, and a control handle adapted to actuate a deflection puller wire for deflecting a portion of the elongated body, and a contraction wire for contracting the generally circular form. The generally circular form which carries at least one ring electrode has an off-edge configuration relative to the elongated body such that a longitudinal axis of the elongated body does not intersect the circumference of the circular form and the generally circular form spirals about the longitudinal axis of the elongated body. Moreover, the circular form can have an on-axis configuration such that the longitudinal axis of the elongated body is axially aligned with a central longitudinal axis of the circular form, or an off-axis configuration such that these axes are axially offset from each other.

Abstract: The embodiments herein provide a method and system for generating heat at a target area of a patient's body for treatment of lesions, tumors, cancer cells, body pain and nerve pain. The heat generated inside a target tissue is distributed throughout the target area. The system and method provides a real time monitoring of the generated heat and the temperature of the tissue. The system comprises a radio frequency (RF) antenna/transducer for receiving the generated RF waves from the RF generator. A controller/optimizer is provided for controlling a frequency of the RF waves and a transmission timing of the RF waves. A RF absorber/distributor comprising a plurality of closed loop circuits is provided. A miniaturized thermometer is arranged inside the RF absorber is arranged close to irradiation area for measuring the temperature which is transmitted to the controller. Several needles/probes are implanted at the target location of patient's body.