a first laser emitter configured for emitting in an axial direction X-X′ a laser beam capable of causing a plasma plume when striking biological tissue;

a spectrum reading unit configured for measuring a spectrum of the plasma plume generated by the laser beam;

a central processing unit in communication with the spectrum reading unit configured for receiving the measured spectrum measured by the spectrum reading unit and for providing an output with a first discrimination value in response to the measured spectrum;

a blowing unit configured for providing a gas flow, either by blowing, by suction, or by blowing and suction, in a region which, in an operating mode, contains a zone of tissue which the laser beam generating the plasma plume strikes;

characterized in that the blowing unit is configured for adapting the flow such to leave the tissue free of any fluids, debris, and other elements not related to the tissue; and

wherein the central processing unit is configured for continuously executing the following instructions:

i. receiving the measured spectrum from the spectrum reading unit;

ii. comparing the received measured spectrum with a plurality of previously stored spectra (E₁, E₂, E₃, . . . , E_m) corresponding to a plurality of light respectively emitted by a plurality of plasma generated by the first laser emitter in a plurality of different biological tissues (T₁, T₂, T₃, . . . , T_n) respectively,

iii. determining a biological tissue (T_i), of the plurality of different biological tissues, that have a spectrum (E_i), of the plurality of previously stored spectra, that is closest to the received measured spectrum;

iv. providing as the first discrimination value, an identification of the biological tissue (T_i) determined in the preceding step.