DEVICE FOR NEEDLELESS INJECTION OPERATING WITH TWO CONCENTRIC ENERGETIC MATERIALS

摘要

The invention concerns pre-filled and disposable needleless injection devices, operating with a gas generator, and used for intradermal, subcutaneous and intramuscular injections. The invention concerns a needleless injection device (1) comprising a pyrotechnical gas generator (2), at least one plunger (13, 14), a liquid active principle reservoir (8) and an injection nozzle (11). The device is mainly characterized in that said generator (2) comprises a pyrotechnical charge (4) consisting of a central energetic material surrounded by a second peripheral energetic material, the two energetic materials having different combustion speeds.