×

Quick connect medication delivery pen

  • US 5,725,508 A
  • Filed: 09/28/1994
  • Issued: 03/10/1998
  • Est. Priority Date: 06/22/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A medication delivery pen comprising:

  • a disposable medication-containing cartridge having a plunger in sliding fluid tight engagement within said cartridge;

    a cartridge assembly for holding said cartridge and having opposed proximal and distal ends with said proximal end having an array of threads;

    a reusable pen body assembly for mounting on said cartridge assembly and including a housing with opposed proximal and distal ends, said distal end having an array of threads dimensioned and having a pitch for threaded engagement with said array of threads at said proximal end of said cartridge assembly;

    a lead screw having a proximal end disposed in said housing and a distal end projecting beyond said distal end of said housing for selective engagement with said plunger to push said plunger in said distal direction, said lead screw having a plurality of threads extending between said proximal end and said distal end of said lead screw and having a pitch substantially equal to said pitch of said array of threads at said distal end of said housing; and

    anti-rotation means for preventing relative rotation between said lead screw and said housing when said housing is being threaded to said cartridge assembly, whereby said lead screw moves in a distal direction in said cartridge assembly as said housing is threadedly moved in a distal direction into said cartridge assembly, said anti-rotation means comprising;

    a rotatable disk having a textured circumference that is mounted at said distal end of said housing to rotate with said lead screw; and

    a plurality of ribs in said cartridge assembly for mating with said textured circumference of said disk to prevent rotation of said lead screw when said housing is threaded to said cartridge assembly.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×