×

Drive mechanism for a medication delivery device and medication delivery device

  • US 9,802,004 B2
  • Filed: 09/03/2010
  • Issued: 10/31/2017
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
Patent Images

1. A drive mechanism for a medication delivery device, comprising:

  • a body having a proximal end and a distal end,a piston rod arranged within the body along an axis of rotation,a drive member arranged within the body, the drive member being rotationally coupled with the piston rod with respect to the axis of rotation,the piston rod configured for both a helical movement and a separate axial movement without rotation with respect to the body, the helical movement of the piston rod comprising a rotation around the axis of rotation and a simultaneous shift along the axis of rotation,the piston rod comprising a guide track, the guide track comprising a helical element and an axial element, anda guide element arranged within the body, the guide element being fixed relatively to the body, whereinthe guide element is coupled to the guide track in such a manner as to guide both the helical movement and the separate axial movement without rotation of the piston rod, and wherein,when the guide element is coupled to the helical element and is rotationally fixed relative to the body during medication delivery, the guide element guides the helical movement of the piston rod, and when the same guide element is coupled to the axial element, it guides the axial movement of the piston rod in a distal direction towards the distal end of the body, the axial movement preceding the helical movement.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×