Patent ID: 6942646

Claim:
An injection device for injection of a medicament from a first medicament cartridge, the injection device comprising a drive mechanism for selectively dispensing the medicament from the first medicament cartridge, a dial dose mechanism by which a user may determine a required dose of medicament to be dispensed, an electronic control unit for controlling the operation of the drive mechanism in response to the dial dose mechanism and a display panel, in which, when an insufficient amount of medicament remains in the first medicament cartridge to enable the required dosage to be dispensed, the insufficient amount of medicament may be dispensed at the discretion of the user, the electronic control unit storing a value corresponding to a difference between the required dose and the insufficient amount of medicament, the value being presented to the user on the display panel as a first amount of medicament to be dispensed from a replacement medicament cartridge following replacement of the first medicament cartridge with the replacement medicament cartridge.