Importance

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Abstract

An automatic medicament injector employing a non-coring needle having side port geometry optimized to minimize or eliminate the coring of a rubber seal or septum when impaled by the internal needle tip of the cannula. The geometry avoids direct exposure of the butt end face of the needle to the rubber seal by providing a crimp to the material at the butt end and openings in the side thereof using electro-discharge machining (EDM) processes providing plural openings therein for introduction of medicament or aspiration through the side port geometry. The automatic medicament injector structure facilitates administration of a medicament to a predetermined target tissue avoiding exposure of the medicament or drug to tissues which would undesirably be damaged by such exposure. A needle housing assembly is disposed in a cylindrical bore of the injector cartridge wherein actuation causes the needle housing assembly to move to a widened second end of the cartridge having a needle housing assembly residence chamber for receiving the needle housing assembly when the needle housing assembly and the ampule are a predetermined distance apart.

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First Claim