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Reusable injection device for distributing a preselected dose

  • US 5,244,465 A
  • Filed: 03/05/1992
  • Issued: 09/14/1993
  • Est. Priority Date: 10/19/1988
  • Status: Expired due to Fees
First Claim
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1. A syringe-type injection device including a dispensing mechanism for dispensing a preset dose of liquid drug, comprising:

  • first and second sleeve-like components releasably connected to each other so as to be aligned in an axial direction, wherein the first sleeve-like component is a holder for the dispensing mechanism and the second sleeve-like component is an ampoule sleeve having an ampoule and a cannula means for connecting the ampoule with the ampoule sleeve;

    a plug in the ampoule;

    an axially movable piston rod extending from said holder through the dispensing mechanism for actuating the plug of the ampoule, wherein said piston rod has a radially projecting cam follower;

    at least one axially extending slot defined in said holder, wherein said slot has a predetermined length and wherein the cam follower is received by the at least one slot such that only a single dose can be dispensed from the ampoule by an axial movement of the piston rod;

    the piston rod having a piston rod neck for acting on the plug of the ampoule; and

    a cap for connecting the dispensing mechanism with the holder such that it cannot be disengaged.

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