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Drive Assembly for a Pen-Type Injector and Pen-Type Injector with a Drive Assembly

  • US 20120209200A1
  • Filed: 07/14/2010
  • Published: 08/16/2012
  • Est. Priority Date: 07/15/2009
  • Status: Abandoned Application
First Claim
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1. A drive assembly for a pen-type injector, comprising:

  • a guiding means having a first and a second end,a drive means,an elongate member coupled to the guiding means and adapted to be driven by the drive means for displacing the guiding means with respect to the drive means, a piston member displaceably disposed at the first end of the guiding means andan adjusting member displaceably disposed at the second end of the guiding means,wherein the drive means is fixedly located with respect to the adjusting member, andwherein the piston member and the adjusting member are coupled such that the sum of the distance between the piston member and the guiding means and the distance between the adjusting means and the guiding means remains constant, wherein the guiding means is formed as a U-shaped device, characterised in that the elongate member is adapted to be rotated by the drive means and wherein the guiding means comprises an opening, the opening and the elongate member forming a threaded connection between the U-shaped guiding means and the elongate member, rotation of the elongate member causing the guiding means to process along the elongate member, wherein the adjusting member is fixedly located with respect to the elongate member and, wherein the guiding means forms a housing with a passageway, wherein the piston member is displaceable located within a first end of the passageway, wherein the adjusting member is formed as a second piston member and is displaceable located within a second end of the passageway.

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