Drive mechanism and injection device herewith
AssigneeSanofi
InventorsDavid Aubrey Plumptre, Simon Lewis Bilton
Life of this patent
Estimating the term…
Abstract
The present invention relates to a drive mechanism which is suitable for an injection device, especially a pen type drug delivery device. The mechanism includes a housing, a dosing member which during dose setting, dose resetting and dose dispensing rotates relative to the housing between a zero dose position and a maximum dose position, and an insert that is rotationally constrained to the housing. The dosing member and the insert each include at least one abutment feature contacting each other when the dosing member reaches its zero dose position during dose dispensing, and an audible and/or tactile feedback is generated by the contact of the abutment features.
Claims18
A drive mechanism for an injection device, the drive mechanism comprising:
- a housing;
- a dosing member rotatable relative to the housing between a zero dose position and a maximum dose position during dose setting, dose resetting, and dose dispensing;
- and
- an insert rotationally constrained to the housing and axially movable between a dose dispensing position and a dose setting and resetting position,
- wherein the dosing member comprises at least one abutment feature configured to contact at least one abutment feature of the insert when the dosing member reaches the zero dose position during the dose dispensing,
- wherein at least one of an audible feedback and a tactile feedback is generated when the at least one abutment feature of the dosing member contacts the at least one abutment feature of the insert, and
- wherein the at least one abutment feature of the insert is configured to contact the at least one abutment feature of the dosing member only when the insert is in the dose dispensing position.
An injection device comprising:
- a cartridge containing a medicament;
- and
- a drive mechanism comprising
- housing;
- a dosing member rotatable relative to the housing between a zero dose position and a maximum dose position during dose setting, dose resetting, and dose dispensing;
- and
- an insert rotationally constrained to the housing and axially movable between a dose dispensing position and a dose setting and resetting position,
- wherein the dosing member and the insert each comprises at least one abutment feature contacting each other when the dosing member reaches the zero dose position during dose dispensing,
- wherein at least one of an audible feedback and a tactile feedback is generated by the contact of the at least one abutment feature of the dosing member and the at least one abutment feature of the insert, and
- wherein the at least one abutment feature of the insert is configured to contact the at least one abutment feature of the dosing member only when the insert is in the dose dispensing position.
A method of operating an injection device, the method comprising:
- setting a dose such that a dosing member rotates relative to a housing of the injection device between a zero dose position and a position below or equal to a maximum dose position;
- and
- dispensing the dose such that at least one abutment feature of the dosing member contacts at least one abutment feature of an insert when the dosing member reaches the zero dose position, thereby generating at least one of an audible feedback and a tactile feedback, the insert being rotationally constrained to the housing of the injection device,
- wherein dispensing the dose comprises axially moving the insert from a dose setting position to a dose dispensing position, such that the at least one abutment feature of the dosing member contacts the at least one abutment feature of the insert only when the insert is in the dose dispensing position, and wherein the insert is rotationally contained to the housing.
Dependencies are inferred from the claim text.