Vapor provision system and cartridge therefor

1. A cartridge for use in a vapor provision system, wherein the cartridge comprises:

an inner container holding a reservoir of fluid to be vaporized; and

an outer housing having a mouthpiece formed therein,

wherein the outer housing extends in a longitudinal direction along an outside of the inner container for at least a portion of the inner container, wherein the inner container and the outer housing are provided with a latch mechanism to retain the inner container within the outer housing, and wherein the cartridge comprises a mechanical connector for longitudinally attaching the cartridge to a control unit of the vapor provision system,

wherein the latch mechanism includes a first member formed on one of the outer housing or the inner container, and a cooperating second member formed on the other of the outer housing or the inner container, and wherein the first member and the second member abut one another to engage the latch mechanism, and

wherein the inner container includes a body holding the reservoir of fluid and a tab, wherein the tab allows airflow through the mouthpiece, and wherein the first member and the second member are longitudinally located adjacent to the tab.

2. The cartridge of claim 1 , wherein the latch mechanism is operable independent of the relative rotational angle between the inner container and the outer housing with respect to the longitudinal direction.

3. The cartridge of claim 1 , wherein the first member and the second member are located at or near an end of the inner container which is longitudinally opposite to a location of the mouthpiece.

4. The cartridge of claim 1 , wherein the first member comprises a radially directed groove in an inner surface of the outer housing and the second member comprises at least one radially directed protrusion on an outer surface of the inner container.

5. The cartridge of claim 1 , wherein the first member comprises a radially directed protrusion from an inner surface of the outer housing and the second member comprises at least one radially directed groove in an outer surface of the inner container.

6. The cartridge of claim 1 , wherein the first member comprises a radially directed protrusion from an inner surface of the outer housing and the second member comprises at least one radially directed protrusion on an outer surface of the inner container.

7. The cartridge of claim 1 , wherein at least one of the first member or the second member extends circumferentially around an axis extending in the longitudinal direction.

8. The cartridge of claim 1 , wherein the first member and the second member are each provided with at least one ramp portion that slide past one another as the inner container is inserted into the outer housing prior to engagement of the latch mechanism.

9. The cartridge of claim 1 , wherein a channel is provided between an inner surface of the outer housing and an outer surface of the inner container to allow vapor to flow longitudinally through the channel to the mouthpiece.

10. The cartridge of claim 9 , wherein the outer housing has a substantially circular cross-section with respect to an axis extending in the longitudinal direction and the inner container has a substantially D-shaped cross-section with respect to the longitudinal direction to provide the channel.

11. The cartridge of claim 9 , wherein the latch mechanism is located within the channel and is sized so as not to obstruct the channel.

12. The cartridge of claim 1 , wherein at least one of the outer housing or the inner container is sufficiently flexibly resilient to support operation of the latch mechanism.

13. The cartridge of claim 1 , wherein the cartridge includes a vaporizer.

14. The cartridge of claim 13 , wherein the mechanical connector further provides an electrical connection for receiving electrical power from the control unit for operating the vaporizer.

15. A vapor provision system including the cartridge of claim 1 .

16. A cartridge for use in a vapor provision system, wherein the cartridge comprises:

an inner container holding a reservoir of fluid to be vaporized; and

an outer housing having a mouthpiece formed therein,

wherein the outer housing extends in a longitudinal direction along an outside of the inner container for at least a portion of the inner container, wherein the inner container and the outer housing are provided with a latch mechanism to retain the inner container within the outer housing, and wherein a channel is provided between an inner surface of the outer housing and an outer surface of the inner container to allow vapor to flow longitudinally through the channel to the mouthpiece.