A device (1) for the application of liquid medical substances (100) comprises a main body (2) extending around a longitudinal axis (X) and comprising a housing portion (3) at a first open end (4) and a delivery portion (5) at a second open end (6) which is opposite the first (4)； a hermetically sealed cartridge reservoir (7) containing a liquid medical substance (100)； a perforating element (8) disposed inside the main body (2) in a position falling between the housing portion (3) and the delivery portion (5) and such as to achieve the perforation of one end of the cartridge reservoir (7). The perforating element (8) has a tubular shape and comprises, in a central portion thereof, a cylindrical conduit (12) having a cutting edge (14) faced towards the housing portion (3).
