Patent ID: 11865318
Assignee: SANOFI
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 20:
21. An injection device configured to expel a dose of a medicament, the injection device comprising:
an elongated housing extending in a longitudinal direction,
a piston rod movable relative to the elongated housing in a longitudinal distal direction to exert a dispensing pressure onto a bung of a cartridge at least partially filled with an injectable medicament,
a rod extension movably arranged on or in a distal end of the piston rod,
a driver operably engaged with the piston rod and movable relative to the elongated housing in a longitudinal proximal direction for setting the dose and movable relative to the elongated housing in the longitudinal distal direction for dispensing the dose, and
an adjuster arranged on or in the driver and operably engaged with the rod extension to move the rod extension in the longitudinal direction relative to the piston rod and wherein the piston rod comprises at least one flexible guide feature that is threadedly engaged with a screw thread of the driver.