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Pen-type injector

  • US 8,888,750 B2
  • Filed: 02/11/2011
  • Issued: 11/18/2014
  • Est. Priority Date: 03/03/2003
  • Status: Active Grant
First Claim
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1. A drug delivery device comprising:

  • a housing;

    a dose dial sleeve that can be rotated out of the housing to select a dose of a product contained within a cartridge, the dose dial sleeve provided with graphics on an outer surface;

    a rotatable piston rod for expelling the selected dose of the productwherein the housing comprises a unitary housing within which the dose dial sleeve and the piston rod are moveably retained anda cylindrical insert rotationally and axially fixed to the housing and threadedly engaged to the piston rod,where the cylindrical insert has a cylindrical portion extending longitudinally in a proximal direction enclosing a portion of the piston rodwherein the unitary housing is configured to completely enclose the cartridge, the dose dial sleeve, the piston rod, and the cylindrical insert.

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