Patent ID: 11918790
Assignee: STEVANTO GROUP S.P.A.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A drug injection device comprising:
a drug container extending along a longitudinal axis and configured to include a predetermined drug volume;
a dose setting mechanism configured to set a drug dose to be delivered out of the drug container;
a dose delivery mechanism configured to deliver the drug dose set by the dose setting mechanism;
a knob configured to rotate about said longitudinal axis during a drug dose setting;
a last dose setting device configured to prevent a user to set a drug dose greater than the drug volume remaining in the drug container after at least one previous drug dose delivery, wherein the last dose setting device comprises:
a main drive pin which is stationary or is configured to move along a first direction of said longitudinal axis without rotating about said longitudinal axis during the drug dose setting and to move along a second direction opposite to said first direction without rotating about said longitudinal axis during a drug dose delivery;
a drive wheel having a first rotation axis parallel to said longitudinal axis and configured to be driven in rotation about the longitudinal axis by the knob, and to be periodically driven in rotation about the first rotation axis by the main drive pin, during the drug dose setting;
a driven wheel having a second rotation axis parallel or coaxial to said longitudinal axis and configured to be periodically driven in rotation about the second rotation axis by the drive wheel;
an abutment element fixedly coupled to, or integrally formed with, the driven wheel and configured to prevent the rotation of the drive wheel about the longitudinal axis when the knob has made a predetermined number of full and/or partial rotations about the longitudinal axis correlated to the predetermined drug volume;
wherein when the knob has made said predetermined number of full and/or partial rotations about the longitudinal axis, said drive wheel abuts against said main drive pin and said abutment element, or
wherein the last dose setting device further includes a stop member configured to abut against said abutment element and to prevent the rotation of the driven wheen about the second rotation axis when the knob has made said predetermined number of full and/or partial rotations about the longitudinal axis and said drive wheel abuts against said main drive pin.