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Drive mechanism for drug delivery device

  • US 10,232,122 B2
  • Filed: 09/03/2010
  • Issued: 03/19/2019
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
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1. A drive mechanism for a drug delivery device, preferably for a pen-type injector, said drive mechanism comprising:

  • a spindle movable in a first direction during a delivery step of dispensing medicament in said drug delivery device,a splined portion operatively coupled to said spindle such that the spindle rotates relative to the splined portion during the delivery step,a retraction means configured as an elastic portion, wherein the retraction means is configured to exert, in a second direction contrary to the first direction, a restoring force on said splined portion at least at an end of said delivery step to cause said spindle and/or said splined portion to move axially in the second direction contrary to said first direction, anda cartridge holder for accommodating a cartridge containing a drug to be delivered,wherein the restoring force causes the spindle and/or the splined portion to move axially in the second direction without relative rotation between the spindle and the splined portion,wherein the splined portion is threadedly engaged with the spindle to allow the relative rotation therebetween, wherein a clearance exists between threads of the splined portion and respective threads of the spindle.

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