Drug delivery device and method for detecting a contact

摘要

The present invention is directed to a drug delivery device with a drive mechanism including a piston rod with a bearing for driving a bung in a cartridge in a distal direction. A movable element is disposed displacably in an axial direction within the drive mechanism. The moveable element is movable between a first position in which a distal end of said movable element protrudes from said bearing and a second position in which a distal end of said movable element lies flush with the distal end of said bearing. The invention is further directed to a method for detecting the contact between the bearing and the movable bung.

主权项

1. A drug delivery device comprising:
a cartridge with a movable bung, a drive mechanism including a piston rod configured as a lead screw with a bearing at a distal end for driving the bung in a distal direction, and a movable element, which is disposed displaceably in an axial direction within the drive mechanism, wherein the moveable element is movable between a first position in which a distal end of said movable element protrudes from said bearing and a second position in which a distal end of said movable element lies flush with the distal end of said bearing, wherein the movable element is disposed in a center hole extending through the bearing in axial direction.