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Injection device

  • US 5,591,136 A
  • Filed: 10/27/1995
  • Issued: 01/07/1997
  • Est. Priority Date: 04/15/1991
  • Status: Expired due to Term
First Claim
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1. An injection device for injecting adjustable dose of an injection liquid (13), comprising:

  • a housing (11,

         21) having a space therein for receiving a container (12) having a piston (14) displaceably arranged therein and containing the injection liquid (13);

    an adjustable-length plunger (29,

         38) in said housing, said plunger being axially displaceable in said housing between a first dosage-setting axial position and a second axial position;

    said plunger acting upon the piston (14) in the container (12) when said plunger moves from said first dosage setting axial position to said second axial position thereof;

    said plunger (29,

         38) comprising adjustment means for selectively adjusting the effective length of said plunger, said plunger and adjustment means including a threaded member (38);

    a threaded spindle (29) guided in an interior thread (35) of said threaded member (38);

    a guide member (34) rotatably connected to said threaded member;

    means (30, 31,

         36) arranged between said guide member and said threaded spindle (29) for axially guiding said threaded spindle and for preventing rotation of said threaded spindle relative to said guide member (34);

    enabling/disabling means (55,

         56) automatically enabling said adjustment means when said plunger is in said first dosage setting axial position and automatically disabling said adjustment means when said plunger is in said second axial position, said enabling/disabling means being operatively arranged between said plunger (29,

         38) and said housing (11,

         21) and responsive to the axial position of said plunger relative to said housing,whereby adjustment of the effective length of said plunger by said adjustment means is automatically disabled when said plunger is in said second axial position.

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