Drug Delivery Device with Dual Layer Spring

Patent metadata

Field	Value
Publication number	US-2016129188-A1
Application number	US-201414897910-A
Country	US
Kind code	A1
Filing date	Jun 12, 2014
Priority date	Jun 14, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

The present invention relates to a drug delivery device ( 1, 100 ) comprising a drug expelling mechanism and a spring ( 10, 110 ) releasable during use of the drug delivery device ( 1,100 ) to convey stored energy to the drug expelling mechanism. The spring ( 10, 110 ) comprises a first helical portion ( 11, 111 ) and a second helical portion ( 13, 113 ) surrounding at least a portion of the first helical portion ( 11, 111 ).

First claim

1 . A drug delivery device comprising a drug expelling mechanism and a spring releasable during use of the drug delivery device to convey stored energy to the drug expelling mechanism, wherein the spring comprises a first helical portion and a second helical portion wound about at least a portion of the first helical portion, and wherein the first helical portion and the second helical portion form one continuous piece.

2 . A drug delivery device according to claim 1 , wherein the spring is formed of a single uninterrupted piece of material.

3 . A drug delivery device according to claim 1 , wherein the first helical portion and the second helical portion are concentric.

4 . A drug delivery device according to claim 1 , wherein the first helical portion is wound about an axis and has a first axial extent, and the second helical portion is wound about the first helical portion and has a second axial extent which is at least 50% of the first axial extent.

5 . A drug delivery device according to claim 1 , wherein the rotational direction of the first helical portion and the second helical portion is the same.

6 . A drug delivery device according to claim 1 , further comprising a housing, wherein the drug expelling mechanism comprises an actuator adapted to interact with a movable wall of a drug reservoir, wherein the spring further comprises a first spring end portion which is an end portion of the first helical portion and a second spring end portion which is an end portion of the second helical portion, and wherein one of the first spring end portion and the second spring end portion is arranged stationarily with respect to the housing during release of energy from the spring, and the other of the first spring end portion and the second spring end portion is operatively coupled with the actuator during release of energy from the spring.

7 . A drug delivery device according to claim 6 , wherein the housing is circular cylindrical and the spring element is arranged concentrically with the housing.

8 . A drug delivery device according to claim 6 , wherein the spring is pre-strained and has sufficient potential energy stored to empty the drug reservoir.

9 . A drug delivery device according to claim 1 , further comprising a dose setting mechanism for selective setting of a dose to be expelled by the drug expelling mechanism, wherein the spring is operatively coupled with the dose setting mechanism and configured to store energy in response to a dose increasing dose setting operation.

10 . A drug delivery device according to claim 1 , wherein one of the first helical portion and the second helical portion acts as a tension spring and the other of the first helical portion and the second helical portion acts as a compression spring.

11 . A drug delivery device according to claim 1 , wherein the first helical portion and the second helical portion both act as a torsion spring.

12 . Use of a spring in a drug delivery device for energising a drug expelling mechanism, the spring comprising an inner helical spring member and an outer helical spring member forming one continuous piece.

Assignees

• Novo Nordisk As

Inventors

• Kiilerich Ebbe

Classifications

• A61M2005/2013

  triggering of discharging means by contact of injector with patient body · CPC title

• A61M5/31555

  by purely axial movement of dose setting member, e.g. during setting or filling of a syringe · CPC title

• A61M5/2033 Primary

  Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287) · CPC title

• F16F1/06

  with turns lying in cylindrical surfaces · CPC title

• A61M5/24

  Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic {(ampoules or carpules A61J1/06)} · CPC title