The current invention 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. In a third aspect the invention relates to a kit for assembling a device for the topical cryotherapy of dermatological disorders.
