Patent ID: 8317785

Claim:
A medical device adapted for the ablation of a target volume inside an anatomical organ, said medical device comprising a main body, a stabilizer for stabilising the medical device relatively to the organ and heating means in the form of a bipolar electrode comprising parts activatable by an external radiofrequency generator for heating said target volume, wherein said bipolar electrode consists of a first element having the form of a straight needle, and a second element having the form of two concentric rigid helices of predetermined diameters and length, and arranged concentric around the straight needle, said first and second elements being independently deployable between first retracted positions inside the stabilizer and second protruding positions outside the stabilizer, wherein the medical device has at least two distinct operational modes with each of the two helices being activatable independently of one another to form a first pole, and a second pole being formed, in a first operational mode, by the straight needle, with the helix other than the helix forming the first pole being inactive, and in a second operational mode, by the helix other than the helix forming the first pole, with the straight needle being inactive; and wherein during operation in either of the first or second operational modes, the external radiofrequency generator activates an active outermost one of the helices and destroys the target volume wrapped by the active outermost one of the helices and destroys the target volume wrapped by the active outermost one of the helices in bipolar mode, while at the same time preserving surrounding tissues located immediately outside of the active outermost one of the helices.