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The invention relates to a portable pump device and a cartridge therefore. The cartridge comprises a first reservoir for a flowable drug provided in combination with a second reservoir comprising a pump liquid, a pump chamber being associated with the first reservoir and adapted to receive the pump

The invention relates to a portable pump device and a cartridge therefore. The cartridge comprises a first reservoir for a flowable drug provided in combination with a second reservoir comprising a pump liquid, a pump chamber being associated with the first reservoir and adapted to receive the pump liquid in order to expel drug from the first reservoir. In a first aspect, the reservoirs of the system may be provided as a disposable cartridge unit to be combined with a further unit to form an delivery device, the delivery device as a whole comprising the pump means for pumping the pump liquid from the second reservoir to the pump chamber, control means for controlling the action of the pump means, and an energy reservoir for energizing the pump means as well as the control means, however, one or more of these components may be incorporated in the disposable cartridge.

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The invention claimed is: 1. 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 pum

The invention claimed is: 1. 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. 2. A cartridge as in claim 1, wherein the drug reservoir is in the form of a substantially cylindrical body with an axially displaceable piston arranged there within, the piston and the pump chamber being arranged such that expansion of the pump chamber displaces the piston axially. 3. A cartridge as in claim 1, wherein the drug reservoir is in the form of a flexible bag, the drug reservoir being enclosed within a non-deformable chamber housing, the pump chamber being defined between an exterior surface of the drug reservoir and an interior wall of the surrounding chamber housing. 4. A cartridge as in claim 1, comprising a housing member having first and second non-deformable sections and a flexible liquid-impermeable membrane defining the drug reservoir between the membrane and the first non-deformable section, and defining the pump chamber between the membrane and the second non-deformable section, whereby expansion of the pump chamber will result in reduction of the volume of the drug reservoir. 5. A cartridge as in claim 1, wherein the pump liquid reservoir is in the form of a flexible bag, or is formed between a non-deformable housing section and a second flexible liquid-impermeable membrane. 6. A cartridge as in claim 1, wherein at least one of the inlet and outlet comprises an opening closed by a penetratable self-sealing membrane. 7. A cartridge as in claim 1, wherein the drug reservoir contains a volume of a flowable drug, the volume of the pump liquid corresponding at least to the volume of the flowable drug. 8. 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 liquid-impermeable 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. 9. A cartridge as in claim 8, wherein the drug reservoir is in the form of a substantially cylindrical body with an axially displaceable piston arranged there within, the piston and the pump chamber being arranged such that expansion of the pump chamber displaces the piston axially. 10. A cartridge as in claim 8, wherein the drug reservoir is in the form of a flexible bag, the drug reservoir being enclosed within a non-deformable chamber housing, the pump chamber being defined between an exterior surface of the drug reservoir and an interior wall of the surrounding chamber housing. 11. A cartridge as in claim 8, wherein the pump liquid reservoir is in the form of a flexible bag. 12. 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 contractible or collapsible 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. 13. A cartridge as in claim 12, wherein the drug reservoir is in the form of a substantially cylindrical body with an axially displaceable piston arranged there within, the piston and the pump chamber being arranged such that expansion of the pump chamber displaces the piston axially. 14. A cartridge as in claim 12, wherein the drug reservoir is in the form of a flexible bag, the drug reservoir being enclosed within a non-deformable chamber housing, the pump chamber being defined between an exterior surface of the drug reservoir and an interior wall of the surrounding chamber housing. 15. A combined portable delivery device comprising a cartridge and a control unit, wherein the cartridge and the control unit include mating coupling means so as to allow the cartridge to be secured to the control unit, the combined delivery device comprising: a variable-volume drug reservoir comprising an outlet and adapted for containing a flowable drug, a pump liquid reservoir comprising a pump liquid contained therein and a pump liquid outlet, a variable-volume pump chamber associated with the drug reservoir and comprising a pump liquid inlet, 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, the drug reservoir, the pump liquid reservoir and the pump chamber being comprised in the cartridge, a pump arranged for receiving pump liquid from the pump liquid outlet and for pumping the pump liquid from the pump liquid reservoir to the pump chamber via the pump liquid inlet, control means comprised in the control unit for controlling the operation of the pump, an energy source for operating the pump and/or the control means, and the mating coupling means providing communication between the pump and the pump liquid outlet and inlet, or between the control means and the pump. 16. A delivery device as in claim 15, wherein the volume of the pump liquid corresponds at least to the volume for which the drug reservoir is adapted.