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US 12,420,028 B2Granted
Medicament injection device
AssigneeSanofi-Aventis Deutschland GmbH
InventorsMichael Jugl, Axel Teucher, Stefan Blancke, Michael Helmer, Marc Schader, Sebastian Braun
Life of this patent
Estimating the term…
Abstract
A medicament delivery device comprising: a main body arranged to receive a medicament cartridge sealed with a penetrable barrier; a needle carrier carrying a needle; a cap removably coupled to the needle carrier, a pre-stressed spring connected to the needle carrier and to the main body, wherein the pre-stressed spring is held by an activation element coupled to the cap, wherein the activation element is arranged to release the spring when the cap is pulled in a distal direction from the device, thereby causing the needle carrier to move axially in a proximal direction.
Claims20
A medicament delivery device, comprising:
- a main body arranged to receive a medicament cartridge sealed with a penetrable barrier, the main body comprising a cartridge holder for receiving the medicament cartridge;
- a needle holder carrying a needle;
- a cap removably coupled to the needle holder;
- a pre-stressed spring connected to the needle holder and to the main body, wherein after assembly of the medicament delivery device and during storage of the medicament delivery device, the pre-stressed spring is held in a pre-stressed state by an activation element coupled to the cap and directly coupled to the pre-stressed spring;
- wherein the activation element is arranged to release the pre-stressed spring when the cap is pulled in a distal direction from the medicament delivery device, thereby causing the needle holder to move axially in a proximal direction;
- wherein the pre-stressed spring is a constant force spring fixed, at a first end thereof, to the cartridge holder and, at a second end thereof, to a carrier attached to the needle holder, wherein the constant force spring is held in the pre-stressed state by a removable portion of the activation element, the cap being moveably coupled to the activation element such that movement of the cap in the distal direction from the medicament delivery device causes the removable portion of the activation element to be removed from engagement with the constant force spring so as to release the constant force spring from the pre-stressed state.
3 more elements
A medicament delivery device, comprising:
- a main body arranged to receive a medicament cartridge sealed with a penetrable barrier, the main body comprising a cartridge holder for receiving the medicament cartridge;
- a needle holder carrying a needle;
- a cap removably coupled to the needle holder;
- a pre-stressed spring connected to the needle holder and to the main body, wherein after assembly of the medicament delivery device and during stage of the medicament delivery device, the pre-stressed spring is held in a pre-stressed state by an activation element coupled to the cap and directly coupled to the main body;
- wherein the activation element is arranged to release the pre-stressed spring when the cap is pulled in a distal direction from the medicament delivery device, thereby causing the needle holder to move axially in a proximal direction;
- wherein the pre-stressed spring is a pull spring attached, at a first end thereof, to the main body and, at a second end thereof, to the needle holder;
- wherein the pull spring is held in the pre-stressed state by a removable portion of the activation element, the cap being moveably coupled to the activation element such that the movement of the cap in the distal direction from the medicament delivery device causes the removable portion of the activation element to be removed from engagement with the pull spring so as to release the pull spring from the pre-stressed state.
4 more elements
A method of operating a medicament delivery device having a cap, the method comprising:
- pulling the cap in a distal axial direction to remove the cap from the medicament delivery device;
- thereby releasing a pre-stressed spring that is held in a pre-stressed state after assembly of the medicament delivery device and during storage of the medicament delivery device by an activation element coupled to the cap and directly coupled to the pre-stressed spring;
- thereby causing proximal movement of a needle holder carrying a needle;
- wherein a proximal end of the needle is caused to pierce a penetrable barrier of a medicament cartridge disposed in the medicament delivery device;
- wherein the pre-stressed spring is fixed, at a first end thereof, to a main body of the medicament delivery device and, at a second end thereof, to the needle holder, wherein the pre-stressed spring is held in the pre-stressed state by a removable portion of the activation element, the cap being moveably coupled to the activation element such that movement of the cap in a distal direction from the medicament delivery device causes the removable portion of the activation element to be removed from engagement with the pre-stressed spring so as to release the pre-stressed spring from the pre-stressed state.
2 more elements
Dependencies are inferred from the claim text.