The device has pressurized gas supply line (4) for guiding gas flow. A liquid feed line (32) supplies liquid. A dispensing tube (24) is provided with open tube end to spray fine droplets or spray liquid-gas mixture. A controllable valve element (6) is arranged in the pressure gas supply line. The constriction (26) of cross-sectional area is provided in dispensing tube. The opening (30) is arranged in region of constriction, through which liquid in gas flow is opened from pressurized gas supply line. The nozzle is formed in constriction in dispensing tube. An independent claim is included for medical spray device kit.