Processing

Please wait...

Settings

Settings

Goto Application

1. WO2014166918 - DISPENSING SPEED CONTROL MECHANISM AND INJECTION DEVICE

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

[ EN ]

Claims:

1 . A dispensing speed control mechanism for use in an injection device having a housing (10, 30, 40; 40'; 40"; 40"') and a drive member (70), which is driven by a power reservoir (100, 100') and axially movable between a dose setting position, in which the drive member (70) is rotationally constrained to the housing (10, 30, 40; 40'; 40"; 40"'), and a dose dispens-ing position, in which the drive member (70) is rotationally de-coupled from the housing (10, 30, 40; 40'; 40"; 40"'), the speed control mechanism comprising friction means (42) for retarding the drive member (70) during dose dispensing depending on the axial position of the drive member (70).

2. The mechanism according to claim 1 , wherein the friction means (42) comprises a clicker mechanism with a clicker arm (42) which is rotationally constrained to the housing (10, 30, 40; 40'; 40"; 40"'), wherein the drive member (70) comprises teeth (71 ) interacting with the clicker arm (42) in the dose dispensing position of the drive member (70).

3. The mechanism according to claim 2, wherein the clicker arm (42) is elastically displaceable in a radially outwards direction, with the stiffness of the clicker arm (42) varying over its length in the longitudinal direction.

4. A handheld injection device comprising a dispensing speed control mechanism ac-cording to any of the preceding claims and a release button (120), which is displaceable to initiate dispensing of a set dose, wherein the drive member (70) is coupled to the release button (120) such that axial displacement of the release button (120) is transferred to the drive member (70).

5. The injection device according to claim 4, further comprising a dose setting member (50), which during dose setting rotates relative to the housing (10, 30, 40; 40'; 40"; 40"') in a first direction and which during dose dispensing rotates relative to the housing (10, 30, 40; 40'; 40"; 40"') in a second opposite direction.

6. The injection device according to any of claims 4 to 5, further comprising a piston rod (80), wherein the drive member (70) is rotationally constrained and axially displaceable to the piston rod (80) and wherein the piston rod (80) is in threaded engagement with the housing (10, 30, 40; 40'; 40"; 40"').

7. The injection device according to any of claims 5 to 6, further comprising a limiter mechanism with a limiting element (60) limiting the rotational movement of the dose setting member between a zero dose position and a maximum dose position, wherein the limiting element (60) is movable on a first path rotationally constrained but axially displaceable relative to one of the housing (10, 30, 40; 40'; 40"; 40"') or the dose setting member (50) and is movable on a second, helical path (53) relative to the other of the housing (10, 30, 40; 40'; 40"; 40"') or the dose setting member (50), and wherein at least one of one of the first path and the second path (53) has an end stop (54, 55) limiting the relative movement of the limiting element (60).

8. The injection device according to any of claims 5 to 7, wherein the dose setting mem-ber (50) is axially constrained within the housing (10, 30, 40; 40'; 40"; 40"').

9. The injection device according to any of claims 5 to 8, further comprising a clutch (72) provided interposed between the dose setting member (50) and the drive member (70), wherein the clutch (72) allows relative rotational movement between the dose setting mem-ber (50) and the drive member (70) during dose setting and prevents relative rotational movement between the dose setting member (50) and the drive member (70) during dose dispensing.

10. The injection device according to any of claims 4 to 9, wherein at least the dose setting member (50) is provided with markings visible from the outside of the housing (10, 30, 40; 40'; 40"; 40"').

1 1 . The injection device according to claim 10, further comprising a display wheel (130), which is provided with markings visible from the outside of the housing (10, 30, 40; 40'; 40"; 40"') and which is coupled to the dose setting member (50) by a gear wheel (140) such that rotation of the gear wheel (140) causes intermitted rotation of the display wheel (130).

12. The injection device according to any of claims 5 to 1 1 , further comprising a last dose protection mechanism (50, 70, 90) for preventing the setting of a dose, which exceeds the amount of liquid left in a cartridge (20), with a limiter (90), which is interposed between the drive member (70) and the dose setting member (50).

13. The injection device according to any of claims 4 to 12 comprising a cartridge (20) containing a medicament.

14. The injection device according to claim 13, wherein the power reservoir (100) for driving the drive member (70) comprises a reverse wound flat spiral spring (100), which is pre-tensioned to store the energy required to dispense the whole contents of the cartridge (20).

15. The injection device according to claim 13, wherein the power reservoir for driving the drive member (70) comprises a torsion spring (100'), which is coupled to the dose setting member (50) such that rotation of the dose setting member (50) tensions the spring (100').