Importance

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Abstract

This invention concerns an endermic injector device (10) for subcutaneous injections without a needle, said device (10) being suitable for injecting under pressure at least one fluid drawn in a measured dose from replaceable phials (15) which are advantageously of a throwaway kind, whereby nozzle means (18), means to aspirate fluid, means to expel fluid and means to provide the required expulsion force are comprised, said device (10) including in cooperation: an aspiration and ejection group (27) consisting of valve means (19) to draw and deliver fluid, a cylindrical chamber (33) to hold fluid together with a removable small piston (34), and safety means with an alignment head (32), a group to control aspiration and expulsion (29) which comprises means for axial withdrawal of said small piston (34), tripping means (36-38) and spring means (52) for the axial forward movement of said small piston (34), means to regulate (60) the pre-loading of said spring means (52) and means (30) to display the quantity of the dose, and means (14) to hold and position said phials (15).

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First Claim