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Claims for Patent: 7,686,786

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Claims for Patent: 7,686,786

Title:Dial-down mechanism for wind-up pen
Abstract: The present invention relates to a dial-down mechanism for an injection device comprising a torsion spring for assisting injection of a dose of medicament from the injection device, the dial-down mechanism comprising dial-up cam arranged to receive and engage with a dial-up key, wherein the dial-up cam and the dial-up key are adapted to, upon rotation of a dose setting member in a first direction, cooperate to strain the torsion spring of the injection device, and a dial-down cam arranged to receive and engage with a dial-down key, wherein the dial-down cam and the dial-down key are adapted to, upon rotation of the dose setting member in a second direction, cooperate to release the torsion spring of the injection device, the second rotation direction being opposite to the first rotation direction.
Inventor(s): Moller; Claus Schmidt (Fredensborg, DK), Enggaard; Christian Peter (Vejby, DK), Radmer; Bo (Hillerod, DK), Markussen; Tom Hede (Bagsv.ae butted.rd, DK)
Assignee: Novo Nordiks A/S (Bagsvaerd, DK)
Application Number:11/665,486
Patent Claims: 1. A dial-down mechanism for an injection device comprising a torsion spring (18) for assisting injection of a dose of medicament from the injection device, the dial-down mechanism comprising dial-up cam (15) arranged to receive and engage with a dial-up key (11), wherein the dial-up cam (15) and the dial-up key (11) are adapted to, upon rotation of a dose setting member in a first direction, cooperate to strain the torsion spring (18) of the injection device, and a dial-down cam (16) arranged to receive and engage with a dial-down key (12), wherein the dial-down cam (16) and the dial-down key (12) are adapted to, upon rotation of the dose setting member in a second direction, cooperate to release the torsion spring (18) of the injection device, the second rotation direction being opposite to the first rotation direction, wherein the dial-up and dial-down cams form part of regions of the same track, further comprising an arm wherein the dial-up and dial-down keys are both located on the same arm, said keys being adapted to engage and cooperate with dial-up and dial-down cams of the same track.

2. A dial-down mechanism according to claim 1, wherein the dial-up cam (15) forms part of a curved track.

3. A dial-down mechanism according to claim 2, wherein the curved dial-up cam (15) forms part of a circular, elliptical or parabolic track.

4. A dial-down mechanism according to claim 1 comprising a first and a second dial-up cam.

5. A dial-down mechanism according to claim 4 comprising a first and a second dial-up key, wherein the first dial-up key is adapted to engage and cooperate with the first dial-up cam, and wherein the second dial-up key is adapted to engage and cooperate with the second dial-up cam.

6. A dial-down mechanism according to claim 1, wherein the dial-down cam (16) forms part of a V-shaped track.

7. A dial-down mechanism according to claim 1 comprising a first and a second dial-down cam.

8. A dial-down mechanism according to claim 7 comprising a first and a second dial-down key, wherein the first dial-down key is adapted to engage and cooperate with the first dial-down cam, and wherein the second dial-down key is adapted to engage and cooperate with the second dial-down cam.

9. A medication delivery device comprising a dial-down mechanism according to claim 1.

10. A medication delivery device according to claim 9, wherein the medication delivery device is a handheld medication injection pen.
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