Cap for an injection device

1 . A cap for an injection device, wherein the injection device includes a removable needle boot for covering a needle of a syringe within the injection device, and a syringe housing for housing the syringe, said cap comprising:

a cap body;

a housing engagement portion configured to be received in an opening of the syringe housing through which the needle extends and engage with a corresponding cap engagement portion of the syringe housing to retain the cap within the opening of the syringe housing; and

a first boot engagement portion movable relative to the cap body, the first boot engagement portion comprising:

a first pinch portion configured to, when the housing engagement portion is received in the opening of the syringe housing and a compressive force is applied to the first pinch portion, both 1) move the first boot engagement portion to engage with the needle boot and 2) move the housing engagement portion to disengage from the housing such that the cap is configured to cause removal of the needle boot from the needle when the cap is removed from the injection device.

2 . The cap of claim 1 , further comprising a second boot engagement portion movable relative to the cap body, the second boot engagement portion comprising:

a second pinch portion configured to engage the second boot engagement portion with the needle boot upon application of a compressive force to the second pinch portion.

3 . The cap of claim 2 , wherein the first boot engagement portion and the second boot engagement portion are diametrically opposed.

4 . The cap of claim 2 , wherein the first boot engagement portion and the second boot engagement portion are movably coupled by a hinge portion.

5 . The cap of claim 4 , wherein the first boot engagement portion and the second boot engagement portion are resiliently deformable such that application of a compressive force to the first pinch portion and the second pinch portion deforms the first boot engagement portion and the second boot engagement portion to effect engagement of the first boot engagement portion and the second boot engagement portion with the needle boot.

6 . The cap of claim 4 , wherein the hinge portion is resiliently deformable such that application of compressive force to the first pinch portion and the second pinch portion deforms the hinge portion to effect engagement of the first boot engagement portion and the second boot engagement portion with the needle boot.

7 . The cap of claim 4 , wherein the first boot engagement portion is configured to contact the needle boot at a first distance, Lc, from the hinge portion,

wherein the first pinch portion is configured to be engaged by a user at a second distance, Lp, from the hinge portion; and wherein the second distance Lp is greater than the first distance Lc.

8 . The cap of claim 2 , wherein the first boot engagement portion comprises a frictious material configured to grip the needle boot.

9 . The cap of claim 8 , wherein the second boot engagement portion comprises a frictious material configured to grip the needle boot.

10 . The cap of claim 9 , wherein one or both of the first boot engagement portion and the second boot engagement portion comprises an insert of resiliently deformable frictious material configured to engage the needle boot.

11 . The cap of claim 9 , wherein the frictious material is overmolded onto the cap.

12 . The cap of claim 11 , wherein the frictious material extends through the first pinch portion and/or the second pinch portion and forms at least one rib configured to grip the first pinch portion and/or the second pinch portion.

13 . The cap of claim 2 , wherein one or both of the first pinch portion and the second pinch portion comprises a tactile pinch portion having at least one rib.

14 . The cap of claim 2 , wherein the first boot engagement portion comprises a first rib configured to abut the second boot engaging portion to limit deflection of the first boot engagement portion.

15 . The cap of claim 14 , wherein the second boot engagement portion comprises a second rib configured to abut the first rib to limit deflection of the first boot engagement portion and the second boot engagement portion.

16 . The cap of claim 1 , wherein the housing engagement portion comprises a protrusion configured to engage a corresponding cut-out in the syringe housing.

17 . The cap of claim 1 , wherein the housing engagement portion comprises a cut-out configured to engage a corresponding protrusion in the syringe housing.

18 . The cap of claim 1 , wherein the housing engagement portion is configured to retain the cap within a portion of the syringe housing when the compressive force applied to the first pinch portion is below a threshold unlocking value.

19 . The cap of claim 18 , wherein the housing engagement portion is configured to unlock the cap from within the portion of the syringe housing when the compressive force applied to the first pinch portion is above the threshold unlocking value.

20 . The cap of claim 19 , wherein the housing engagement portion comprises a cam surface configured to progressively increase the compressive force to the first pinch portion when the cap is separated from the syringe housing.

21 . The cap of claim 1 , further comprising at least one retaining clip and at least one corresponding retaining surface, wherein the at least one retaining clip is configured to engage with the at least one corresponding retaining surface such that the first boot engagement portion remains engaged with the needle boot after compressive force has been removed from the first pinch portion.

22 . The cap of claim 21 , wherein the cap comprises two retaining clips and two corresponding retaining surfaces.

23 . The cap of claim 22 , further comprising a first sidewall and a second sidewall, wherein the two retaining clips are disposed on the first sidewall and the two corresponding retaining surfaces are disposed on the second sidewall.

24 . The cap of claim 23 , wherein a first one of the retaining clips is disposed on the first sidewall, a first one of the retaining surfaces is disposed on the second sidewall, a second one of the retaining clips is disposed on the second sidewall, and a second one of the retaining surfaces is disposed on the first sidewall.

25 . The cap of claim 21 , wherein each one of the at least one retaining clips comprises a tine.

26 . The cap of claim 1 , further comprising at least one tab configured to engage and retain the needle boot within the cap.

27 . A grip accessory for a syringe, comprising:

the syringe housing configured to retain the syringe; and

the cap according to claim 1 .

28 . A manual injection device comprising the grip accessory of claim 27 , the needle boot, and the syringe.

29 . The cap of claim 1 , wherein the cap body defines a sheath configured to receive the needle boot, and the first boot engagement portion is cantilevered to the sheath.

30 . The cap of claim 1 , wherein the housing engagement portion is biased in an outward direction away from a central axis of the syringe housing when the compressive force is not applied to the first pinch portion.

31 . The cap of claim 1 , wherein the cap is configured such that application of the compressive force along an inward direction towards a central axis of the syringe housing causes the housing engagement portion to move along the inward direction to disengage from the corresponding cap engagement portion of the housing.