The current invention concerns a device for the topical cryotherapy of dermatological disorders, the device comprising: a housing for holding a pressurized carbon dioxide cartridge； an applicator nozzle comprising (i) an internal channel for guiding the outflow of carbon dioxide from said pressurized carbon dioxide cartridge, and (ii) an applicator surface onto which carbon dioxide ice may be formed； and an actuator mechanism for controlling an outflow of carbon dioxide from said pressurized carbon dioxide cartridge to said applicator nozzle. The invention further concerns a cryogenic applicator pen comprising an actuator assembly for controlling an outflow of a cryogenic fluid, wherein said actuator assembly comprises at least one spring leaf, wherein said spring leaf on one side bears against a ball of a ball valve and on an opposite side bears against a positioning casing bearing a needle for piercing a cryogenic fluid cartridge. In a second aspect, the invention provides an actuator assembly suitable for cryogenic device for controlling an outflow of a cryogenic fluid, wherein said actuator assembly comprises at least one spring leaf and a needle, whereby said spring leaf is bearing against a ball of a ball valve, and whereby said actuator assembly is sealed to said cryogenic device by sealing o-rings.La présente invention concerne un dispositif pour la cryothérapie topique de troubles dermatologiques, le dispositif comprenant : un boîtier pour contenir une cartouche de dioxyde de carbone sous pression ； une buse d'applicateur comprenant (i) un canal interne pour guider l'écoulement de dioxyde de carbone à partir de ladite cartouche de dioxyde de carbone sous pression, et (ii) une surface d'applicateur sur laquelle de la glace carbonée peut être formée ； et un mécanisme d'actionneur pour commander un écoulement de dioxyde de carbone à partir de ladite cartouche de dioxyde de carbone sous pression vers ladite buse d'applicateur. L'invention concerne en outre un s
