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Drive mechanisms suitable for use in drug delivery devices

  • US 10,226,579 B2
  • Filed: 11/16/2016
  • Issued: 03/12/2019
  • Est. Priority Date: 03/03/2003
  • Status: Active Grant
First Claim
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1. An injector comprising:

  • a cartridge holder;

    an exterior housing connected to the cartridge holder and enclosing a dose setting and delivery mechanism comprising,a non-circular cross section piston rod;

    a dose dial sleeve;

    a nut having external splines;

    a unidirectional coupling,the injector further comprising a dose dial grip axially fixed to a distal end of the exterior housing, where the dose dial grip rotates relative to the exterior housing and is in a clutched engagement with a drive sleeve such that during dose setting the drive sleeve and dose dial grip are rotationally fixed,wherein the unidirectional coupling allows movement of the piston rod in proximal direction and prevents movement of the piston rod in the distal direction during dose setting.

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