Medicament delivery device and actuation mechanism for a drug delivery device

1. A medicament delivery device comprising:

a housing; and

an actuation mechanism positioned within the housing, the actuation mechanism comprising a first sleeve configured to telescopically extend from within the housing, and a second sleeve configured to telescopically extend from within the housing and longitudinally extend beyond a distal end of the first sleeve,

wherein, while the actuation mechanism is in a first pre-injection state in which both the first sleeve and the second sleeve cover a distal tip of a needle, the second sleeve is movable proximally relative to the first sleeve to a pre-injection position to place the actuation mechanism in a second state, and

wherein, while the actuation mechanism is in the second state, the first sleeve is movable relative to the housing to cause the needle to protrude distally from the second sleeve and the first sleeve and to cause the first sleeve to contact an injection site.

2. The medicament delivery device of claim 1 , wherein:

while the actuation mechanism is in the first pre-injection state, a distal end of the second sleeve is distal to the distal end of the first sleeve, and the distal end of the second sleeve and the distal end of the first sleeve are distal to the distal tip of the needle;

while the actuation mechanism is in the second state, the distal end of the second sleeve is substantially coplanar with the distal end of the first sleeve, and the distal end of the first sleeve and the distal end of the second sleeve are proximal to the distal tip of the needle; and

while the actuation mechanism is in a third post-injection state, the actuation mechanism is locked to the housing, and the distal end of the first sleeve and the distal end of the second sleeve are distal to the distal tip of the needle.

3. The medicament delivery device of claim 1 , wherein the second sleeve in the pre-injection position is configured to couple with the first sleeve such that the first sleeve and the second sleeve move together while the actuation mechanism is in the second state.

4. The medicament delivery device of claim 3 , further comprising a locking mechanism including a latch and a recess engageable with one another to couple the second sleeve with the first sleeve while the actuation mechanism is in the second state.

5. The medicament delivery device of claim 1 , further comprising a spring element to bias the actuation mechanism in a distal direction relative to the housing.

6. The medicament delivery device of claim 1 , wherein the second sleeve and the first sleeve are configured such that the distal tip of the needle is proximal to a distal end of the second sleeve and the distal end of the first sleeve while the actuation mechanism is in the first pre-injection state and when the second sleeve is in the pre-injection position.

7. The medicament delivery device of claim 1 , wherein the first sleeve and the second sleeve have different colors or indicia.

8. The medicament delivery device of claim 1 , wherein the first sleeve is fixed relative to the housing while the actuation mechanism is in the first pre-injection state.

9. The medicament delivery device of claim 1 , wherein, while the actuation mechanism is in a third post-injection state, the second sleeve is locked relative to the first sleeve and the first sleeve is locked relative to the housing.

10. The medicament delivery device of claim 1 , wherein, while the actuation mechanism is in the second state, the first sleeve is movable relative to the housing to actuate a delivery mechanism.

11. The medicament delivery device of claim 10 , wherein the medicament delivery device is an autoinjector configured to automatically deliver a dose of medicament upon actuation of the delivery mechanism.

12. The medicament delivery device of claim 1 , wherein the housing further comprises a reservoir containing a medicament to be dispensed through the needle.

13. The medicament delivery device of claim 12 , wherein the medicament comprises an antibody or fragment thereof.

14. An actuation mechanism for a medicament delivery device, the actuation mechanism comprising:

a first sleeve configured to telescopically extend from a housing of the medicament delivery device; and

a second sleeve configured to telescopically extend from the housing of the medicament delivery device and longitudinally extend beyond a distal end of the first sleeve,

wherein, while the actuation mechanism is in a first pre-injection state in which both the first sleeve and the second sleeve cover a distal tip of a needle, the second sleeve is movable proximally relative to the first sleeve to a pre-injection position to place the actuation mechanism in a second state,

wherein, while the actuation mechanism is in the second state, the first sleeve is movable relative to the housing of the medicament delivery device to cause the needle to protrude distally from the second sleeve and the first sleeve, and the first sleeve and the second sleeve are movable distally relative to the housing of the medicament delivery device to place the actuation mechanism in a third post-injection state, and

wherein, while the actuation mechanism is in a third post-injection state, the first sleeve and the second sleeve cover the needle.

15. The actuation mechanism of claim 14 , wherein:

while the actuation mechanism is in the first pre-injection state, a distal end of the second sleeve is distal to the distal end of the first sleeve, and the distal end of the second sleeve and the distal end of the first sleeve are distal to the distal tip of the needle;

while the actuation mechanism is in the second state, the distal end of the second sleeve is substantially coplanar with the distal end of the first sleeve, and the distal end of the first sleeve and the distal end of the second sleeve are proximal to the distal tip of the needle; and

while the actuation mechanism is in a third post-injection state, the actuation mechanism is locked to the housing of the medicament delivery device, and the distal end of the first sleeve and the distal end of the second sleeve are distal to the distal tip of the needle.

16. The actuation mechanism of claim 14 , wherein the second sleeve in the pre-injection position is configured to couple with the first sleeve such that the first sleeve and the second sleeve move together while the actuation mechanism is in the second state.

17. The actuation mechanism of claim 16 , further comprising a locking mechanism including a latch and a recess engageable with one another to couple the second sleeve with the first sleeve while the actuation mechanism is in the second state.

18. The actuation mechanism of claim 14 , further comprising a spring element to bias the actuation mechanism in a distal direction relative to the medicament delivery device.

19. The actuation mechanism of claim 14 , the second sleeve and the first sleeve are configured such that the distal tip of the needle is proximal to a distal end of the second sleeve and the distal end of the first sleeve while the actuation mechanism is in the first pre-injection state and when the second sleeve is in the pre-injection position.

20. The actuation mechanism of claim 14 , wherein the first sleeve and the second sleeve have different colors or indicia.

21. The actuation mechanism of claim 14 , wherein the first sleeve is fixed relative to the housing of the medicament delivery device when the actuation mechanism is in the first pre-injection state.

22. The actuation mechanism of claim 14 , wherein, while the actuation mechanism is in a third post-injection state, the second sleeve is locked relative to the first sleeve and the first sleeve is locked relative to the housing of the medicament delivery device.

23. The actuation mechanism of claim 14 , wherein, while the actuation mechanism is in the second state, the first sleeve is movable relative to the housing of the medicament delivery device to actuate a delivery mechanism of the medicament delivery device.

24. An actuation mechanism for a medicament delivery device, the actuation mechanism comprising:

a first sleeve configured to telescopically extend from a housing of the medicament delivery device,

a second sleeve configured to telescopically extend from the housing of the medicament delivery device, and

one or more spring elements to bias the first sleeve and the second sleeve in a distal direction relative to the housing of the medicament delivery device,

wherein, while the actuation mechanism is in a first state in which both the first sleeve and the second sleeve cover a distal tip of a needle, the second sleeve protrudes from the first sleeve and is movable proximally relative to the first sleeve to place the actuation mechanism in a second state, and

wherein, while the actuation mechanism is in the second state, the first sleeve is movable relative to the housing of the medicament delivery device to cause the needle to protrude distally from the second sleeve and the first sleeve.