Patent ID: 11872379
Assignee: MEDMIX SWITZERLAND AG
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 12:
13. A drug delivery device, comprising:
a housing configured to connect to a dispensing unit comprising a compartment containing a fluid;
a piston rod configured to move in a proximal direction to eject the fluid; and
a dosing mechanism, the dosing mechanism comprising an actuation member to be actuated by a user to advance the piston rod and to thereby eject a set dose out of the compartment and a conversion mechanism configured to convert movement of the actuation member to movement of the piston rod, the conversion mechanism comprising a nut and a driver, the nut threadedly engaged with the piston rod and rotationally fixed to the housing during delivery of the set dose, the driver rotatable and axially movable with respect to the housing during dose delivery and configured to axially advance the nut during dose delivery, the conversion mechanism comprising a friction reduction mechanism, the friction reduction mechanism disposed between the nut and the driver to reduce friction therebetween during dose delivery.