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Automatic Injector

  • US 20070265568A1
  • Filed: 11/04/2005
  • Published: 11/15/2007
  • Est. Priority Date: 11/04/2004
  • Status: Abandoned Application
First Claim
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1. An automatic injector for delivering a dose of medicament into a user'"'"'s body at an injection site, comprising:

  • a housing having a proximal end and a distal end;

    a syringe assembly movably supported within the housing, the syringe assembly including a syringe barrel having an open end and a closed end, a plunger assembly including a stopper, and an injection needle;

    a drive member operably and releasably coupled with the syringe barrel and movable between a retracted position and an extended position;

    a drive spring operably coupled to the drive member to bias the drive member into the extended position;

    a trigger mechanism including a latch capable of retaining the drive member in the retracted position against a force of the drive spring;

    at least one mechanical stop connected to the housing, limiting movement of the syringe assembly toward the distal end of the housing to a maximally extended position;

    wherein;

    activation of the trigger mechanism causes movement of the latch to release the drive member retained in the retracted position, and the drive spring forces the drive member, and the syringe assembly releasably coupled thereto, to move toward the distal end of the housing from the retracted position toward the extended position, forcing the needle to puncture the user'"'"'s body at the injection site;

    as the needle punctures the user'"'"'s body, a resistive force acts upon the needle, and upon one of the syringe barrel contacting the mechanical stop and resistive force reaching a predetermined level, the drive member disengages the syringe barrel and additional movement of the syringe barrel and the needle coupled thereto in the direction of the distal end of the housing is prevented; and

    with the drive member disengaged from the syringe barrel, the drive spring forces continued movement of the drive member in the direction of the distal end of the housing, forcing the drive member into engagement with the syringe plunger assembly, and forcing the plunger assembly to expel the medicament contained within the syringe barrel through the needle into the user'"'"'s body.

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