Detachable drug delivery device

1. A reservoir for use in a wearable infusion device, comprising:

a substantially rigid base, the base having a perimeter;

a substantially rigid top, the top having a perimeter; and

a flexible rolling diaphragm between the base and the top, the diaphragm having an outer perimeter sealed along the perimeter of the base and an inner perimeter sealed along the perimeter of the top, the diaphragm being arranged to dispose the top and the base immediately adjacent each other when the reservoir is empty and to dispose the top and the base in spaced apart relation when the reservoir is full.

2. The reservoir as defined in claim 1 , wherein the diaphragm has an S-shaped cross-section.

3. The reservoir as defined in claim 1 , wherein the diaphragm has an accordion-like cross-section.

4. The reservoir as defined in claim 1 , wherein the diaphragm has a smooth cross-section.

5. The reservoir as defined in claim 1 , wherein the inner perimeter of the diaphragm is sealed along the perimeter of the top by thermal welding, thermal compression, adhesive bonding, laser welding, ultrasonic welding, mechanical crimping, mechanical clamping or combinations thereof.

6. The reservoir as defined in claim 1 , further comprising a clamping ring, wherein the outer perimeter of the diaphragm is in sealed confinement between the clamping ring and the perimeter of the base.

7. The reservoir as defined in claim 1 , wherein the top includes a first substantially planar member and a second substantially planar member in surface contact with the first substantially planar member, and wherein the diaphragm inner perimeter is in sealed confinement between the first and second substantially planar members.

8. The reservoir as defined in claim 1 , wherein the base includes a first member and a second member, wherein the reservoir further comprises a clamping ring, and wherein the outer perimeter of the diaphragm is in sealed confinement between the clamping ring and the first member of the base.

9. A wearable infusion device, comprising:

a base arranged to be adhered to the skin of a patient;

a cannula assembly carried on the base; a pumping unit arranged to be received on the base in fluid communication with the cannula assembly; and

a reservoir arranged to be received by the pumping unit, the reservoir including, a substantially rigid base, the base having a perimeter,

a substantially rigid top, the top having a perimeter, and

a flexible rolling diaphragm between the reservoir base and the top, the diaphragm having an outer perimeter sealed along the perimeter of the reservoir base and an inner perimeter sealed along the perimeter of the top, the diaphragm being arranged to dispose the top and the reservoir base immediately adjacent each other when the reservoir is empty and to dispose the top and the reservoir base in spaced apart relation when the reservoir is full.

10. The device as defined in claim 9 , wherein the diaphragm has an S-shaped cross-section.

11. The device as defined in claim 9 , wherein the diaphragm has an accordion-like cross-section.

12. The device as defined in claim 9 , wherein the diaphragm has a smooth cross-section.

13. The device as defined in claim 9 , wherein the inner perimeter of the diaphragm is sealed along the perimeter of the top by one of thermal welding, thermal compression, and adhesive bonding.

14. The device as defined in claim 9 , further comprising a clamping ring, wherein the outer perimeter of the diaphragm is in sealed confinement between the clamping ring and the perimeter of the reservoir base.

15. The device as defined in claim 9 , wherein the top includes a first substantially planar member and a second substantially planar member in surface contact with the first substantially planar member, and wherein the diaphragm inner perimeter is in sealed confinement between the first and second substantially planar members.

16. The device as defined in claim 9 , wherein the reservoir base includes a first member and a second member, wherein the reservoir further comprises a clamping ring, and wherein the outer perimeter of the diaphragm is in sealed confinement between the clamping ring and the first member of the reservoir base.