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Automatic injector

  • US 6,767,336 B1
  • Filed: 01/09/2003
  • Issued: 07/27/2004
  • Est. Priority Date: 01/09/2003
  • Status: Expired due to Fees
First Claim
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1. An automatic injector, comprising:

  • a transparent cartridge holder sleeve having a leading end and a an open trailing end;

    said leading end having a diameter that does not exceed a diameter of said transparent cartridge holder sleeve;

    said cartridge holder sleeve having a lumen;

    a cartridge adapted to hold a liquid medicament;

    a cannula hub mounted to a leading end of said cartridge;

    a cannula mounted to a leading end of said cannula hub;

    a piston disposed in trailing relation to said cartridge;

    a spacer disposed in trailing and engaging relation to said piston;

    a spring holder disposed in trailing and engaging relation to said spacer;

    a spring-retaining shoulder formed in said spring holder near a leading end thereof;

    said cartridge, piston, and spring holder being slideably received within said lumen;

    an inner gun sleeve having a leading end positioned within said lumen, said inner gun sleeve secured to said cartridge holder sleeve at said open trailing end of said cartridge sleeve;

    a piston biasing spring under compression having a leading end disposed in abutting relation to said spring-retaining shoulder of said spring holder and a trailing end disposed in abutting relation to a trailing end of said inner gun sleeve;

    said trailing end of said inner gun sleeve adapted to releasably engage a trailing end of said spring holder;

    said cartridge, piston, spring holder, and cannula being positioned within said lumen in a retracted position when said piston biasing spring is under compression;

    said cartridge, piston, and spring holder being positioned within said lumen in an extended position and said cannula extending out of said lumen in leading relation to said cartridge sleeve holder when said piston biasing spring is in repose; and

    manually operated releasing means for disengaging said trailing end of said spring holder from said trailing end of said inner gun sleeve so that said piston biasing spring unloads when said releasing means is activated;

    said manually operated releasing means including manual displacement of said inner gun sleeve in a trailing-to-leading direction;

    a sharps protector movably mounted to said leading end of said cartridge holder sleeve and having a retracted position and an extended position;

    said sharps protector being in said retracted position when said cannula of said automatic injector is in a retracted position;

    said sharps protector being in said extended position when said cannula is in an extended position;

    said sharps protector when in said retracted position having a length sufficient to extend beyond a distal end of said cannula when said cannula is in said retracted position; and

    said sharps protector when in said extended position having a length sufficient to extend beyond a distal end of said cannula when said cannula is in said extended position.

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