Application nozzle for a device for the dermo-cosmetic treatment of dark skin spots by cyto-selective cryotherapy

A nozzle for a device for dermo-cosmetic treatment of dark skin spots by cyto-selective cryotherapy, comprising a spray jet supplied by a tank of pressurized liquefied cryogenic gas, said nozzle comprising an upper ring for connecting to a shell, extended by a central body of which a side wall which narrows downwards has longitudinal openings and delimits a gas expansion chamber communicating with a frustoconical dispersal conduit arranged inside an end piece to be applied to skin and opening to an outside through a discharge port, wherein said discharge port of the end piece has an axial offset with respect to a central axis of the central body, wherein the side wall of the central body has an inclination with respect to a longitudinal axis of the nozzle, wherein said longitudinal openings of the side wall have side faces which are, in an upper part of the central body, flared and turned outwards in a divergent manner, and, in a lower part of the central body, flared and turned inwards in a divergent manner, wherein a section of the central body is substantially trapezoidal and decreasing from the upper part of the central body to the lower part of the central body, and wherein said side faces include sideways side faces.