The object of the invention relates to an apparatus for the thermal treatment of biological tissues by means of the application of focused ultrasound waves, the apparatus including:a probe movement system (7) for ensuring: the moving of the focal zone (Z) along a first direction (X), from a distal point (D) of the treatment zone (T) to a proximal point (P) of the treatment zone, in order to create a sequence (S) of elementary treatment zonesthe juxtaposition of sequences (S, S1, S2, S3, . . . ) of elementary treatment zones in order to completely cover the treatment zone (T)a control circuit (6) controlling the probe (2), in order to ensure that the ultrasonic power delivered to the focal zone decreases between the distal point (D) and the proximal point (P) of the treatment zone.
