Dial-down mechanism for wind-up pen

• US RE46,363 E1
• Filed: 11/27/2013
• Issued: 04/11/2017
• Est. Priority Date: 10/21/2004
• Status: Active Grant

• Current Assignee: Novo Nordisk A/S
• Original Assignee: Novo Nordisk A/S
• Inventors: Moeller, Claus Schmidt, Enggaard, Christian Peter, Radmer, Bo, Markussen, Tom Hede
• Primary Examiner(s): DOERRLER, WILLIAM CHARLES
• Application Number:
  US14/091,774
• Time in Patent Office: 1,231 Days
• Field of Search: 604134, 604135, 604136, 604131, 604132, 604133
• 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,

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.

11. A method for using a wind up injection pen, the method comprising the steps of

rotating a first element in a first direction, the direction being a dial up direction;

causing a second element to be rotated in the same direction as the first element;

straining a torsional spring;

moving an arm that is in engagement with one edge to a neighboring edge, wherein when the arm is engaged with an edge it prevents the torsional spring from unwinding;

rotating the first element in a second direction opposite the first direction;

moving a pick-up key and radially lifting the arm out of engagement with an edge and when the arm is fully disengaged from an edge allowing the second rotatable element to rotate in the second direction and allowing the strain on the spring to be decreased.