Hand piece for aesthetic and medical device

A hand piece for an aesthetic and medical device, comprising:

• a first body portion (110) having a cylindrical structure in which a cartridge mounting space (111), in which a cartridge accommodating a liquid cosmetic product or liquid medication is mounted, extends with a certain length in a vertical direction and one or more auxiliary air flow paths (112) are formed to be adjacent to an outer circumferential surface of the cartridge mounting space (111) in a vertical direction;
• a second body portion (120) bound to a lower side of the first body portion (110) and having a cylindrical structure having an upper side on which an air pressure providing portion (140) configured to provide air pressure to the cartridge-mounting space (111) and the auxiliary air flow paths (112) is mounted, having a lower side on which an air supply line (150) configured to provide compressed air to the air pressure providing portion (140) is mounted, and having a center in which a compressed air flow path (121), through which the compressed air provided from the air pressure supply line (150) is transferred to the air pressure providing portion (140), is formed in a center;
• and
• a spray head portion (130) bound to an upper body of the first body portion (110) and having a central part on which a spray needle (131) bound to an upper body of the cartridge to upwardly spray the liquid cosmetic product or liquid medication accommodated in the cartridge is mounted.