Patent ID: 7407490

Claim:
A cartridge for a delivery device, the cartridge comprising: a variable-volume drug reservoir comprising an outlet and adapted for containing a predefined volume of a flowable drug, a pump liquid reservoir comprising a volume of a pump liquid contained therein and a pump liquid outlet allowing liquid to be expelled out of the cartridge, the pump liquid outlet being adapted to be connected to an inlet of a pump arranged outside the cartridge, a variable-volume pump chamber associated with the drug reservoir and comprising a pump liquid inlet allowing the variable-volume pump chamber to receive liquid from outside the cartridge, the pump liquid inlet being adapted to be connected to an outlet of a pump arranged outside the cartridge, the pump chamber being adapted to receive the pump liquid in order to expel a drug from the drug reservoir as the pump chamber expands, wherein the volume of the pump liquid corresponds at least to the volume for which the drug reservoir is adapted.