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Drive Mechanism for a Drug Delivery Device and Drug Delivery Device

  • US 20150165130A1
  • Filed: 05/28/2013
  • Published: 06/18/2015
  • Est. Priority Date: 05/30/2012
  • Status: Active Grant
First Claim
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1. A drive mechanism for a drug delivery device (1), comprising:

  • a piston rod (11), which is displaced in a distal direction (25) for a delivery of a dose and in a proximal direction (26) for a reset, anda rotatable drive member (16), which is threadedly engaged with the piston rod (11) and rotates during the delivery of the dose,characterized in thata biasing member (20) is provided, which is loaded by the rotation of the drive member (16) during the delivery of the dose and tends to rotate the piston rod (11) with respect to the drive member (16) in such a way that the piston rod (11) is screwed into the drive member (16) and thereby advanced in the proximal direction (26).

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