US 12,109,398 B2Granted

Torsion spring driven injection device

AssigneeNovo Nordisk A/S

InventorsClaus Urup Gjoedesen, Niels Christian Egholm Soerensen, Kim Roennow Sejtzer

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Abstract

The invention relates to a torsion spring driven injection device for ejecting set doses of a liquid drug. In a first aspect the torsion spring driven injection device is provided with a blocking structure which is operated by the rotatable display element such that the set dose can only be expelled when a certain minimum dose size has been set. In a second aspect the torsion spring driven injection device is provided with a release mechanism which secures that the set dose can only be expelled as one single full dose in one stroke. The two aspects can easily be combined such that the predetermined minimum dose size most be expelled as one single dose.

Claims17

Dependent claims

A torsion spring driven injection device for ejecting at least one dose of a liquid drug comprising:

a housing structure securing a container containing the liquid drug to be ejected,
a rotational dose setting element operable by a user for setting the size of a set dose to be ejected,
a rotatable dose setting structure transferring rotation from the dose setting element to a straining of a torsion spring such that a torque is stored in the torsion spring upon rotation of the dose setting element,
a rotatable display element arranged to follow rotation of the dose setting structure and helically movable relatively to the housing structure from an initial position to a dosing position, wherein the set dose is indicated by indicia carried by the rotatable display element,
a piston rod arranged in a longitudinal direction (X) and movable in a distal direction to expel the set dose from the container,
a rotatable drive element engaging the piston rod and adapted to move the piston rod in the distal direction upon rotation of the rotatable drive element,
an axially movable release element for releasing the torque stored in the torsion spring to rotate the rotatable drive element,
wherein,
the injection device further comprises a blocking structure which is operable between a first position and a second position, and wherein
the blocking structure in the first position prevents axial movement of the release element and in the second position allows axial movement of the release element,
and which blocking structure is operational by the rotatable display element,
such that whenever the rotatable display element is rotated to a specific axial position and/or rotational position it activates the blocking structure such that the release element becomes axially movable to thereby release the set dose.

9 more elements

A torsion spring driven injection device for ejecting at least one dose of a liquid drug comprising:

a housing structure securing a container containing the liquid drug to be ejected,
a rotational dose setting element operable by a user for setting the size of the dose to be ejected,
a rotatable dose setting structure transferring rotation from the dose setting element to a straining of a torsion spring such that a torque is stored in the torsion spring upon rotation of the dose setting element,
a rotatable display element arranged to follow rotation of the dose setting structure and helically movable relatively to the housing structure from an initial position to a dosing position, wherein the set dose is indicated by the rotatable dose setting element,
a piston rod arranged in a longitudinal direction and movable in a distal direction to expel the set dose out from the container,
a rotatable drive element engaging the piston rod and adapted to move the piston rod in the distal direction upon rotation of the rotatable drive element,
an axially movable release element for releasing the torque stored in the torsion spring to rotate the rotatable drive element,
wherein the release element is provided with one or more teeth axially engaging corresponding teeth provided on the rotatable drive element and a torque arising from the torsion spring during dosing is transferred from the one or more teeth of the release element to the corresponding teeth on the rotatable drive element such that a rotation of the release element during dosing is transferred to a rotation of the rotatable drive element,
and wherein the one or more teeth on the release element are slidable in the axial direction in relation to the corresponding teeth on the rotatable drive element,
wherein,
at least one of the corresponding teeth on the rotatable drive element proximally is provided with a radial extension which hinders the teeth and the release element from sliding in the axial direction in relation to the corresponding teeth on the rotatable drive element when a torque above a certain threshold value is being applied to the corresponding teeth.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/286,845Filed 28 Oct 2019
Priority: EP 1820337030 Oct 2018
Published: US 2021/0386933 A116 Dec 2021
Granted: 8 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

A61M 5/2033
Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically: spring-loaded one-shot…
A61M 5/31526
Dosing: by means of stepwise axial movements, e.g. ratchet mechanisms or detents
A61M 5/31543
Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset…
A61M 5/3157
Means improving security or handling thereof: means providing feedback signals when administration is completed

Family

US 2021/0386933 A1Pre-grant publication · published 16 Dec 2021
US 12,109,398 B2This patent

From the US filing history. Foreign family members aren’t listed.

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