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Drive mechanisms suitable for use in drug delivery devices

  • US 20070093761A1
  • Filed: 09/14/2006
  • Published: 04/26/2007
  • Est. Priority Date: 03/03/2003
  • Status: Active Grant
First Claim
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1. A drive mechanism for use in a drug delivery device comprising:

  • a housing having a helical thread;

    a dose dial sleeve having a helical thread engaged with the helical thread of the housing;

    a drive sleeve releasably connected to the dose dial sleeve;

    and a clutch means located between the dose dial sleeve and the drive sleeve;

    the clutch means configured such that, a) when the dose dial sleeve and the drive sleeve are coupled, both are allowed to rotate with respect to the housing; and

    b) when the dose dial sleeve and the drive sleeve are de-coupled, rotation of the dose dial sleeve with respect to the housing is allowed, while rotation of the drive sleeve with respect to the housing is prevented, whereby axial movement of the drive sleeve is allowed so that a force is transferred in the longitudinal direction to a proximal end of the drug delivery device.

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