surgical apparatus (100) for liposuction comprising: a source of microwave energy (102) arranged to emit a controllable power level of microwave radiaciónde a probe (104) for insertion into a treatment region in the biological tissue, the probe including: an antenna connected to receive microwave radiation output and arranged to emit towards fueraun field of microwave radiation to provide microwave energy in the region treatment, and a conduit for transporting liquefied fat away from the treatment region a suction pump (106) connected to the conduit (203) a detector (120) arranged to detect microwave power directly supplied to the probe yun controller (114) to adjust the controllable power level of microwave radiation, characterized in that: the detector (120) is arranged to detect microwave power reflected back from the regiónde treatment the controller (114) is arranged to select a profile of power between a pluralidadde delivery profiles predetermined energy based on changes in the power microondasreflejada detected based on the power of direct and reflected microwaves detected for suministrarenergía microwave according to a profile predetermined power supply and the apparatus further comprises: a variable attenuator (112) controlled by the controller (114) to modify the amplitude of laradiación microwave from the microwave power source according to the selected power profile desuministro and a switch (116) controlled by the controller (114) for modulating the radiation microondasprocedente source of microwave energy to allow an operation of pulsed wave ocontinuo according to the delivery profile of selected energy, wherein the plurality profiles supply predetermined energy includes profiles power supply in which the frequency of the microwave radiation and the controllable power level are selected so that the field of microwave radiation emitted automatically adopt unaprimera configuration when emitted fat and a second configuration when emitted ensangre, microw
