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Automatic self-injection device

  • US 5,478,316 A
  • Filed: 02/02/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 02/02/1994
  • Status: Expired due to Term
First Claim
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1. An automatic injection device comprising:

  • a housing;

    a syringe assembly slidably mounted to said housing, said syringe assembly including a cartridge and a piston slidably mounted within said cartridge;

    means for causing said syringe assembly to slide with respect to said housing from a storage position to a deployed position, said means for causing including a constant force spring having one end secured to said housing and a second end variably wound with respect to said syringe assembly to provide a substantially constant force upon said syringe assembly between said storage and deployed positions;

    means for causing said piston to slide within said cartridge from a first position to a second position such that the contents of said cartridge are expelled, andmeans for releasably retaining said constant force spring in a selected position.

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