Patent ID: 9555194
Date: 2017-01-31
CPC Classifications: A61M

Claim:
1. A drug delivery device, comprising: a body having a receptacle for a drug, where the receptacle is provided for inserting a cartridge; a piston rod in the body, the piston rod being movable relatively to the body and being provided for expelling the drug out of the receptacle, where the piston rod can rotate with respect to the body while delivering the drug; a mechanism provided to drive the piston rod in a distal direction while delivering the drug, the piston rod having a start position with respect to the mechanism; a piston rod nut configured to guide the movement of the piston rod relatively to the body while delivering the drug, where the piston rod nut is threaded to the piston rod; a spring for releasing the piston rod from the piston rod nut when the cartridge is removed from the receptacle such that the piston rod nut can rotate around the piston rod the spring configured to enable a reset of the piston rod to the start position; and a lock nut provided for inhibiting a movement of the piston rod in a distal direction away from the start position when the cartridge is removed from the receptacle and the piston rod has been released.