Abstract: The present invention is related to a medical device (1) adapted for the ablation of a target volume inside an anatomical organ, said medical device (1) comprising as elements a main body (2), stabilising means (3) for stabilising the device relatively to the organ and heating means in the form of a bipolar electrode (10) comprising parts activable by an external radiofrequency generator for heating said target volume, wherein said bipolar electrode comprises a first element having the form of a central anchoring member (5), and a second element having the form of at least two concentric rigid helices or coils (4?,4?, ) of predetermined diameter (D) and length (L), said helices surrounding the central anchoring member (5). The present invention also concerns a surgical assembly comprising said medical device and controlling means as well as a process for the specific destruction a target volume inside an organ by means of said medical device or surgical assembly.