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Reloadable injector

  • US 5,425,715 A
  • Filed: 08/05/1993
  • Issued: 06/20/1995
  • Est. Priority Date: 08/05/1993
  • Status: Expired due to Term
First Claim
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1. An automatic injector comprising:

  • a reusable power pack assembly including a body and an energy releasing assembly carried by said body, said energy releasing assembly capable of providing multiple energy releasing strokes; and

    a disposable cartridge assembly adapted to be positioned in functionally cooperative relation with said power pack assembly to effectuate an injection operation therewith during one of said energy releasing strokes, said cartridge assembly comprising(i) a rigid housing,(ii) a container disposed within said rigid housing,(iii) a single charge of medicament normally contained within said container,(iv) a needle held in a normally protected position within said housing and adapted to communicate with said charge of medicament normally contained in said container, said needle being movable from said protected position within said housing to an unprotected projecting position from said housing in response to one of said energy releasing strokes,(v) a plunger disposed within said container and movable therethrough in response to one of said energy releasing strokes to force said medicament through said needle when said needle is moved into said unprotected projecting position from said housing, and(vi) a needle return spring constructed and arranged to move said needle from said unprotected projecting position to said protected position within said rigid housing,said disposable cartridge assembly being movable out of said functionally cooperative relation with said power pack assembly so that after said injection operation said cartridge assembly can be discarded as a separate unit from said power pack assembly with said rigid housing preventing unwanted contact with said needle disposed in said protected position therein, said energy releasing assembly carried by said body being maintained with said body after said injection operation for use with another cartridge assembly to effectuate another injection operation.

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