| 摘要 |
The invention concerns the technical field of needleless syringes for injecting an active principle through the skin. More particularly, the invention concerns a needleless syringe (1) provided with a piezoelectric crystal (12) and a triggering device comprising a triggering member (3) and impacting means and, on a triggering device particularly adapted to needleless syringes. The invention is mainly characterised in that the impacting means comprises a latch (10) maintained under elastic stress by being blocked against a stop element (8) and the triggering member (3) is capable of moving said latch (10) to release it, so that it is urged to strike the piezoelectric crystal (12). Then, said crystal (12) produces an electric arc designed to initiate a pyrotechnic charge (2) whereof the combustion gases will help to expel the active principle contained in the syringe.
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