Injection Device

摘要

An injection device with a travelling clutch which can be shifted between two different positions by the activation of an injection button. In the first position, the injection button and the driver is allowed to rotate relatively to the piston rod, which is blocked from rotation by the clicker element. In the second position, the drive sleeve and the injection button is axially movable while the piston rod is allowed to rotate.

主权项

1. A drug delivery device comprising:
a housing, a piston rod having one or more threads, a nut member disposed within the housing, that cooperates with the piston rod so that the piston rod is screwed in a distal direction when rotated relatively to the member, a drive sleeve that rotates the piston rod during dose administration, a releasable coupling operational between a first position and a second position to secure the piston rod against rotation during dose setting, but during dose administration allows the piston rod to rotate.