Spindle for a drug delivery device
AssigneeSanofi-Aventis Deutschland GmbH
InventorDavid Aubrey Plumptre
Life of this patent
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Abstract
A spindle for driving a bung of a cartridge. The spindle includes a generally circular shaft having an outer surface. The generally circular shaft extends from a distal end to a proximal end of said circular shaft. A first helical groove is provided along a first portion of the outer surface. The first helical groove having a first pitch. A second helical groove provided along a second portion of the outer surface of the generally circular shaft. The second helical groove overlapping the first helical groove. The second helical groove having a second pitch.
Claims24
A dose setting mechanism for use with a drug delivery device, said dose setting mechanism comprising:
- a housing insert comprising a helical groove form;
- a spindle for driving a bung of a cartridge, said spindle comprising:
- a generally circular shaft having an outer surface;
- a first helical groove provided along a first portion of said outer surface of said generally circular shaft, said first helical groove having a first pitch;
- and
- a second helical groove provided along a second portion of said outer surface of said generally circular shaft, said second helical groove overlapping said first helical groove, said second helical groove having a second pitch, and said second helical groove engaging the helical groove form of the housing insert;
- and
- a driver for driving said spindle, said driver comprising a helical groove form that engages said first helical groove provided along said first portion of said outer surface of said generally circular shaft of said spindle,
- wherein a longitudinal axial movement of the driver causes the spindle to rotate, and
- wherein the driver is prevented from rotating with respect to a drug delivery device housing during dispensing a dose.
Dependencies are inferred from the claim text.