Injection device

  • US 5,435,076 A
  • Filed: 11/24/1993
  • Issued: 07/25/1995
  • Est. Priority Date: 04/21/1992
  • Status: Expired due to Term
First Claim
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1. A device for an injection apparatus, comprising:

  • a dual-chamber injection cartridge, comprising;

    a front end and a rear end;

    a front opening in the vicinity of a front end of said cartridge;

    a front chamber located in the vicinity of said front opening and including a drug freeze-dried in said front chamber,a rear chamber including a liquid component,a movable wall separating said front chamber and said rear chamber,a bypass for transferring said liquid component between said front chamber and said rear chamber, anda rear piston;

    a cylindrical sleeve substantially the same length as said cartridge, said cartridge being slidably arranged within said sleeve;

    a stopper located in the vicinity of said front opening of said cartridge, said stopper being directed rearwardly coaxially with said cartridge, wherein as said sleeve is displaced rearwardly after the freeze-drying of said drug said stopper enters the front opening of said cartridge to sealingly close said cartridge; and

    means in the vicinity of said rear end of said cartridge for attaching means for actuating said rear piston.

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