Dial-Down Mechanism for Wind-Up Pen

• US 20080147005A1
• Filed: 10/20/2005
• Published: 06/19/2008
• Est. Priority Date: 10/21/2004
• Status: Active Grant

• Current Assignee: Novo Nordisk A/S
• Original Assignee: NOVO Nordisk Biotech Incorporated (Novo Nordisk A/S)
• Inventors: Markussen, Tom Hede, Radmer, Bo, Enggard, Christian Peter, Moller, Claus Schmidt
• Granted Patent: US 7,686,786 B2
• Time in Patent Office: Days
• US Class Current: 604/134
• CPC Class Codes: A61M 2005/202 cocking means, e.g. to bias the main drive spring of an injector
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• CPC Class Codes: A61M 5/31535 Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
• CPC Class Codes: A61M 5/3155 by rotational movement of dose setting member, e.g. during setting or filling of a syringe
• CPC Class Codes: A61M 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/31583 based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod
• CPC Class Codes: A61M 5/31586 performed by rotationally moving or pivoted actuator, e.g. an injection lever or handle
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

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.

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.

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 dial-down mechanism according to claim 1, wherein the dial-up and dial-down cams form part of regions of the same track.

10. A dial-down mechanism according to claim 9, wherein the dial-up and dial-down keys are constituted by the same key, said key being adapted to engage and cooperate with dial-up and dial-down cams of the same track.

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

12. A medication delivery device according to claim 11, wherein the medication delivery device is a handheld medication injection pen.