ASSEMBLY FOR DRUG DELIVERY DEVICE Russian patent published in 2018 - IPC A61M5/315 

FIELD: medicine.

SUBSTANCE: invention relates to medical equipment, in particular to an assembly for a drug delivery device. Assembly comprises an actuator which is configured to perform a setting movement in a proximal direction in order to set a dose of a drug, and which is configured to perform a dispense movement in a distal direction in order to dispense a dose of a drug, a stop mechanism acting after a maximum amount of a drug has been delivered, and which is configured to axially constrain the setting movement of the actuator such that the setting of a dose is inhibited, wherein the constrained axial movement of the actuator is allowed, wherein the constrained axial movement is greater than zero, but less than the drug dose setting movement; a piston rod, wherein the piston rod comprises a last dose stop, and wherein the stop mechanism comprises a stop element, wherein a movement of the actuator in a proximal direction is inhibited when the stop element abuts the last dose stop, a drive member which is configured to be moved along the piston rod in a proximal direction in order to set a dose, wherein the drive member is configured to drive the piston rod towards a dispensing end of the device during the dispensing of a dose, the drive member being connected to the actuator in such a way that the movement of the drive member results in the movement of the actuator and vice versa; wherein the stop element is arranged at an internal surface of the drive member, wherein the stop element has a projection configuration on the internal surface of the drive member. Piston rod comprises a guiding feature, wherein the guiding feature and the stop element are configured to interact such that a rotation of the piston rod is inhibited during the setting of a dose, and a rotation of the piston rod is enabled during the dispensing of a dose. Guiding feature comprises splines.

EFFECT: providing an assembly for a drug delivery device having improved properties.

12 cl, 11 dwg