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US 2017/0000948 A1Published application
Drive mechanism for a drug delivery device and drug delivery device
AssigneeSanofi-Aventis Deutschland GmbH
InventorDavid Aubrey Plumptre
Life of this patent
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Abstract
The drive mechanism comprises a lead screw and a lead screw nut, which are aligned with an axis. The lead screw has screw threads having the same pitch and being intertwined.
Claims9
A drive mechanism for a drug delivery device, comprising:
- a lead screw and a lead screw nut aligned with an axis defining an axial direction and an opposite axial direction,
- a screw thread and at least one further screw thread of the lead screw, the screw thread and the further screw thread having the same pitch and being intertwined, and
- a drive feature of the lead screw nut,
- the drive feature engaging the screw thread and the further screw thread and allowing for a dispense operation a helical movement of the lead screw with respect to the lead screw nut at least in the axial direction.
1 more element
Dependencies are inferred from the claim text.