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Cartridge for an injection device

  • US 5,709,662 A
  • Filed: 08/23/1996
  • Issued: 01/20/1998
  • Est. Priority Date: 08/23/1996
  • Status: Expired due to Term
First Claim
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1. An assembly for providing automatic injections, comprising:

  • a drive assembly including a housing and a drive rod slidably mounted within said housing;

    a sleeve positionable within said housing;

    a syringe assembly slidably mounted within said sleeve, said syringe assembly including a cartridge and a piston slidably mounted within said cartridge, said drive rod being operatively associated with said syringe assembly when said sleeve is positioned within said housing;

    a spring for urging said drive rod towards said syringe assembly;

    one of said sleeve and said housing including a stop member and the other of said sleeve and said housing including an engagement member engageable with said stop member, said stop member and engagement member being arranged such that said engagement member engages said stop member when said sleeve is inserted along a longitudinal axis into said housing, thereby preventing withdrawal of said sleeve from said housing along said longitudinal axis, said engagement member being disengageable from said stop member upon rotation of said sleeve about said longitudinal axis to permit the sleeve to be removed from the housing.

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