Patent ID: 9492616
Filing Date: 2016-11-15
CPC Classification: A61M

Claim Text:
1. A medicament delivery device for the administration of one or more drug agents, the device comprising a medicament cartridge retainer for holding a medicament cartridge, an attachment for attachment thereto of a dispense interface, the dispense interface for providing an exit pathway for the medicament contained in the cartridge, an interface sensor configured to provide an output indicative of whether the dispense interface is attached to the attachment, a piston rod for driving a bung of the medicament cartridge, a drive train for advancing the piston rod to the bung, a controller configured to control the drive train to advance the piston rod towards the bung when the output of the interface sensor indicates that the dispense interface is not on the attachment and to disable advancement of the piston rod when the output of the interface sensor indicates that the dispense interface is at least partially on the attachment, wherein the controller is operative to sense stalling of the drive train, wherein the stalling of the drive train occurs upon contact between the piston rod and the bung, following the piston rod not being in contact with the bung, and wherein the controller is further configured to stop the drive train when stalling of the drive train is sensed.