NEEDLELESS INJECTOR Russian patent published in 2002 - IPC

FIELD: medical equipment, used for injection of liquid medicinal agent into the object tissues. SUBSTANCE: the needleless injector has an actuating mechanism connected to an ampulla preliminarily filled with liquid and provided with an opening and a piston. The actuating mechanism has a built-in power source, using compressed gas which displaces a plunger for striking the free piston with its subsequent displacement for ejection of a dose of liquid, and a plunger lock, the chamber with compressed air exerts permanent pressure on the plunger. The ampulla is made of glass with a piston in the body. The piston is made of material that is inelastic at a slow application of force and elastic at a quick application of force, or contains polytetrafluoroethylene. EFFECT: enhanced efficiency of injection, reduced pain injury to tissues. 51 cl, 12 dwg