Drive mechanism and injection device herewith
AssigneeSanofi
InventorsDavid Aubrey Plumptre, Simon Lewis Bilton
Life of this patent
Estimating the term…
Abstract
A drive mechanism suitable for an injection device includes a housing, a piston rod at least axially movable relative to the housing, and a drive member which is coupled to the housing via a first clutch such that a relative rotation of the drive member about an axis of rotation with respect to the housing is prevented during dose setting and is allowed during dose dispensing. The drive member engages the piston rod such that a rotation of the drive member causes an axial movement of the piston rod. Re-engagement of the first clutch causes rotation of the drive member with respect to the housing in a direction moving the piston rod in the proximal direction.
Claims15
A drive mechanism, for an injection device, having a distal end and an opposite proximal end, the drive mechanism comprising:
- a housing;
- a piston rod at least axially movable relative to the housing;
- and
- a drive member coupled to the housing via a first clutch such that a relative rotation of the drive member about an axis of rotation with respect to the housing is inhibited during dose setting and is allowed during dose dispensing, the drive member engaging the piston rod such that a rotation of the drive member causes an axial movement of the piston rod,
- wherein engagement of the first clutch causes rotation of the drive member with respect to the housing in a direction to move the piston rod in a proximal direction.
An injection device comprising:
- a housing;
- a cartridge containing a medicament;
- and
- a drive mechanism having a distal end and a proximal end, the drive mechanism comprising
- a piston rod at least axially movable relative to the housing, and
- a drive member coupled to the housing via a first clutch such that a relative rotation of the drive member about an axis of rotation with respect to the housing is inhibited during dose setting and is allowed during dose dispensing, the drive member engaging the piston rod such that a rotation of the drive member causes an axial movement of the piston rod,
- wherein engagement of the first clutch causes rotation of the drive member with respect to the housing in a direction to move the piston rod in a proximal direction.
Dependencies are inferred from the claim text.