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Dose mechanism for an injection device for limiting a dose setting corresponding to the amount of medicament left

DC
  • US 9,775,953 B2
  • Filed: 11/21/2014
  • Issued: 10/03/2017
  • Est. Priority Date: 07/27/2005
  • Status: Active Grant
First Claim
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1. A mechanism for preventing setting of a dose which exceeds the amount of a medicament in a reservoir in an injection device, wherein a dose is set by rotating a dose setting member of a dose setting mechanism, the mechanism comprising:

  • a piston rod having a threaded outer surface;

    a housing defining a passage for the piston rod, the passage having a threaded inner surface for engagement with the threaded outer surface of the piston rod, the housing being arranged with respect to the piston rod such that rotation of the piston rod in relation to the housing causes the piston rod to be displaced relative to the housing in a longitudinal direction;

    a limiter defining a passage for the piston rod;

    a driver defining a passage for the limiter, the driver being coupled to the dose setting member such that rotation of the dose setting member during dose setting causes the driver to rotate; and

    wherein the limiter is coupled to the driver and the piston rod such that relative rotation between the driver and the piston rod during dose setting causes the limiter to move towards a stopping position wherein the limiter prevents setting of a dose which exceeds the amount of a medicament in a reservoir in the injection device.

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