seringa sem agulha com injetor de elementos encaixados

The invention concerns the field of needleless syringes for injecting an active principle for therapeutic purposes. More particularly, it concerns a needleless syringe for injecting an active principle ( 7 ) initially set between an injector ( 1, 10 ) comprising at least an injection nozzle, said injector being contacted with the skin, and a wall ( 8 ) mobile under the effect of a propelling system ( 9 ) pressurizing and expelling the active principle through the injector located at the syringe downstream end ( 2 ). In order to produce nozzles in a considerable injector thickness and to control the jet coherence distance, said injector ( 1, 10 ) comprises at least two elements ( 3, 4 ) whereof the contact surfaces ( 30, 40, 40 ') are oriented towards the skin, at least a groove ( 31, 41, 41' ) forming an injection nozzle in the assembly of said elements.