Devices and methods for delivering a beneficial agent to a user

1. A device for delivering a beneficial agent, comprising:

a cassette including a cassette housing with a fluid reservoir defined therein, the cassette housing having a cassette base region, the cassette base region including a back surface and a front surface opposite the back surface, the cassette base region including a boundary comprising an opening extending between and through the front surface and back surface of the cassette base region;

a delivery tube fluidly coupled with the fluid reservoir;

a pump including a pump housing containing a pump assembly having a fluid drive component, the pump housing having a receiving region to receive the cassette base region, the fluid drive component disposed proximate the receiving region; and

a lock member coupled to the pump housing and movable between an open position and a closed position,

wherein the cassette is configured so as to be capable of being inserted into and removed from the receiving region when the lock member is in the open position, and secured to the pump with the boundary of the cassette base region received by the receiving region with the lock member through the opening and a length of the delivery tube in operative engagement with the fluid drive component when the lock member is in the closed position.

2. The device of claim 1 , further comprising an alignment pin operatively coupled to the lock member, wherein movement of the lock member between the open position and the closed position extends at least a portion of the alignment pin into engagement with the cassette housing.

3. The device of claim 2 , wherein the cassette housing defines a receiving recess proximate the cassette base region to receive the alignment pin when the lock member is moved toward the closed position.

4. The device of claim 3 , wherein the receiving recess is tapered toward a closed end.

5. The device of claim 3 , wherein the receiving recess is defined by an alignment key projecting from a cassette body region into the cassette base region.

6. The device of claim 2 , wherein the alignment pin comprises a tapered end.

7. The device of claim 2 , wherein the lock member comprises a protrusion and the alignment pin comprises a notch to receive the protrusion to engage the lock member to operatively couple the alignment pin to the lock member.

8. The device of claim 1 , wherein the receiving region further comprises a torsion spring mechanically coupled to the lock member.

9. The device of claim 1 , wherein the lock member is a latch.

10. The device of claim 9 , wherein the latch further comprises a latch cam surface; and

the pump further comprises an occlusion block disposed proximate the receiving region and having an occlusion block cam surface, the occlusion block being biased to urge the occlusion block cam surface against the latch cam surface.

11. The device of claim 10 , wherein the latch cam surface and the occlusion block cam surface are configured to urge the occlusion block toward an operative position to hold the peristaltic tube in functional relationship to the fluid drive component when the latch is moved from the open position toward the closed position.

12. The device of claim 11 , wherein the latch cam surface and the occlusion block cam surface are configured to define a dead zone wherein the occlusion block remains in the operative position during continued movement of the latch from the open position to the closed position.

13. The device of claim 12 , wherein the dead zone is defined by 10 degrees of final movement of the latch from the open position to the closed position.

14. The device of claim 9 , wherein the latch comprises a pivotal latch mounted on a hinge.

15. The device of claim 9 , wherein the latch comprises a draw latch mounted for sliding movement.

16. The device of claim 1 , further comprising a beneficial agent contained in the fluid reservoir.

17. The device of claim 16 , wherein the beneficial agent comprises one or more of levodopa and carbidopa.

18. The device of claim 1 , wherein the cassette base region includes an engagement surface configured to be engaged by the lock member when in the closed position.

19. The device of claim 18 , wherein the engagement surface comprises a recessed area recessed relative the back surface of the cassette base region.

20. The device of claim 19 , wherein the recessed area is shaped to receive the lock member when in the closed position.