Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020141043 - A SHIELD TRIGGER MECHANISM AND AN INJECTION DEVICE WITH A SHIELD TRIGGER MECHANISM

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS:

1. A shield trigger mechanism for triggering the ejection of a dose of a liquid drug from a spring driven injection device, comprising:

a needle shield (50) which is rotatably relatively to a housing structure (1) between a locked position and an unlocked position,

wherein the needle shield (50) in the locked position is prevented from axial movement rela tively to the housing structure (1),

and wherein the needle shield (50) in the unlocked position is axially movable relatively to the housing structure (1) in response to an axial force (S) being applied to the needle shield (50) to thereby activate the spring driven injection device to automatically eject the dose of the liquid drug,

and which needle shield (50) is rotational guided from the locked position to the unlocked po sition by a track arrangement (60, 60A, 60B),

Characterized in that,

the track arrangement (60, 60A, 60B) is configured to prevent the needle shield (50) in rota tion from the locked position to the unlocked position during application of the axial force (S) to the needle shield (50) by having a physical stop (22) incorporated in the track arrangement (60, 60A, 60B).

2. A shield trigger mechanism according to claim 1 , wherein the track arrangement (60, 60A, 60B) comprises a helical track region (60B)

3. A shield trigger mechanism according to claim 2, wherein the helical track region (60B) is associated with the housing structure (1).

4. A shield trigger mechanism according to claim 2 or 3, wherein the needle shield (50) is provided with a protrusion (52) guided in the helical track region (60B).

5. A shield trigger mechanism according to any of the claims 2, 3 or 4, wherein the helical track region (60B) terminates into an axial track (21).

6. A shield trigger mechanism according to claim 5, wherein the helical track region (60B) or the axial track (21) are provided with a physical stop (22) preferably preventing the protrusion (52) on the needle shield (50) in moving from the helical track region (60B) and into the axial track (21) during application of the axial force (S) to the needle shield (50).

7. A shield trigger mechanism according to claim 6, wherein the needle shield (50) is urged in the distal direction when the force (S) is removed from the needle shield (50) whereby the protrusion (52) is able to escape the physical stop (22).

8. A spring driven injection device for delivering doses of a liquid drug, comprising

a housing structure (1) having a container (5) containing the liquid drug and a spring driven dose engine,

a needle shield (50) which is rotatably relatively to the housing structure (1) between a locked position and an unlocked position,

and wherein the needle shield (50) when in the locked position is prevented from axial movement relatively to the housing structure (1),

and wherein the needle shield (50) in the unlocked position is axially movable relatively to the housing structure (1) in response to an axial force being applied to the needle shield (50) to thereby activate the spring driven dose engine to automatically eject the dose of the liquid drug from the container (5),

and which needle shield (50) is rotational guided from the locked position to the unlocked po sition in a track arrangement (60, 60A, 60B),

Characterized in that,

the track arrangement (60, 60A, 60B) is configured to prevent the needle shield (50) in rota tion from the locked position to the unlocked position during application of the axial force (S) to the needle shield (50), by having a physical stop (22) incorporated in the track arrange ment (60, 60A, 60B).

9. A spring driven injection device according to claim 8, wherein the track arrangement (60, 60A, 60B) comprises a helical track region (60B).

10. A spring driven injection device according to claim 9, wherein the helical track region (60B) is associated with the housing structure (1).

11. A spring driven injection device according to claim 9 or 10 wherein the needle shield (50) is provided with a protrusion (52) guided in the helical track region (60B).

12. A spring driven injection device according to any of the claims 9, 10 or 11 , wherein the helical track region (60B) terminates into an axial track (21).

13. A spring driven injection device according to claim 12, wherein the helical track region (60B) or the axial track (21) are provided with a physical stop (22) preventing the protrusion (52) on the needle shield (50) in moving from the helical track region (60B) and into the axial track (21) during application of the axial force (S) to the needle shield (50).

14. A spring driven injection device according to claim 13, wherein the needle shield (50) is urged in the distal direction when the force (S) is removed from the needle shield (50) whereby the protrusion (52) is able to escape the physical stop (22).