Needleless syringe with two injection speed levels

摘要

The invention concerns the field of needleless syringes for injecting a liquid active principle. It improves bioavailability by providing injection at two speed levels. The syringe comprises a reservoir (2) contained between an injector (3) and push means subjected to the action of a gas generator (7), said push means comprising an end, directed towards the active principle, which forms a delivery head (4) whereof the cross-section is smaller than the powering head (6) cross-section, the powering travel (C1) in the power cylinder (10) being shorter than the height (H1) of the active principle reservoir (2).