Delivery device

1. A delivery device comprising a first rotatable magazine and a second rotatable magazine, each magazine being provided with a plurality of metering members adapted to dispense a measured amount of material, a material delivery passage and a material delivery orifice, and at least one push rod adapted to move a metering member from a material retaining position to a material dispensing position, wherein the device is provided with means for engaging the first magazine whilst disengaging the second magazine and which engaging means is moveable from an engaging to a disengaging position and vice-versa.

2. A delivery device according to claim 1 characterised in that the material is a medicament.

3. A delivery device according to claim 2 characterised in that the medicament metering member comprises a spool and a spool carrier wherein the void between the spool carrier is filled with medicament.

4. A delivery device according to claim 3 characterised in that the device is provided with a pair of magazines and said pair of magazines contain the same medicament.

5. A delivery device according to claim 3 characterised in that the device is provided with a pair of magazines and said pair of magazines contain different medicaments.

6. A delivery device according to claim 2 characterised in that the medicament delivery device is an inhaler.

7. A delivery device according to claim 1 characterised in that the material is a dry powder.

8. A delivery device according to claim 1 characterised in that the magazine is substantially circular.

9. A delivery device according to claim 1 characterised in that the engaging means comprises male and female interlocking members.

10. A delivery device according to claim 9 characterised in that the magazine is provided with a female member and a drive means is provided with a male member.

11. A delivery device according to claim 10 characterised in that a drive plate is provided with a male member and is adapted to engage with the drive means.

12. A delivery device according to claim 11 characterised in that the male member comprises a resilient protrusion which is resiliently biased towards a second magazine, but is constructed so as to be urged to engage with a female member of a first disc magazine, such that when the urging means is removed the male member is biased towards and engages with the second magazine.

13. A delivery device according to claim 12 characterised in that the actuator means comprises at least two radially acting push rod mechanisms which may operate together, independently or sequentially.

14. A dry powder inhaler comprising a plurality of metering members adapted to dispense a measured amount of medicament and held in a first rotatable magazine and a second rotatable magazine, an inhalation passage and a mouthpiece, and at least one push rod adapted to move one of the plurality of metering members from a medicament retaining position to a medicament dispensing position, wherein the inhaler is provided with means for engaging the first magazine whilst disengaging the second magazine and which engaging means is moveable from an engaging to a disengaging position and vice-versa.

15. A dry powder inhaler according to claim 5 characterised in that the medicaments are fluticasone and salmeterol.

16. A dry powder inhaler according to claim 14 characterised in that the inhaler is provided with two push rods.

17. A method of administering a dry powder medicament using a delivery device according to claim 7 .

18. A method according to claim 17 characterised in that a combination of medicaments are administered.

19. A method of treatment of a patient with a respiratory disorder comprising the administration of a therapeutically effective amount of a medicament using an inhaler according to claim 6 .