Drive mechanism for a drug delivery device and drug delivery device
AssigneeSanofi-Aventis Deutschland GmbH
InventorsStephen David Butler, Mark Philip Horlock
Life of this patent
Estimating the term…
Abstract
The drive mechanism for a drug delivery device comprises a piston rod, which is displaced in a distal direction for a delivery of a dose and in a proximal direction for a reset, and a resilient member, which acts on the piston rod during a reset and tends to restrict the movement of the piston rod in the proximal direction. The resilient member may be a biasing member provided for an automatic reset, a compression spring entering the piston rod or a torsion spring provided to generate a rotation. The drug delivery device is provided with such a drive mechanism.
Claims19
1-18. (canceled)
A drive mechanism for a drug delivery device, comprising:
- a piston rod, which is displaced in a distal direction for a delivery of a dose and in a proximal direction for a reset, and
- a resilient member which acts on the piston rod during a reset and tends to restrict the movement of the piston rod in the proximal direction,
- characterized in that
- the resilient member is selected from the group consisting of a biasing member provided for an automatic reset, a compression spring entering the piston rod, and a torsion spring provided to generate a rotation.
Dependencies are inferred from the claim text.