Spindle for a Drug Delivery Device
AssigneeSanofi-Aventis Deutschland GmbH
InventorDavid Plumptre
Life of this patent
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Abstract
A spindle (242; 414; 542; 642) for driving a bung of a cartridge is provided. The spindle includes a generally circular shaft having an outer surface (560). The generally circular shaft extends from a distal end to a proximal end of said circular shaft. A first helical groove (219; 519; 619) is provided along a first portion of the outer surface. The first helical groove having a first pitch. A second helical groove (221; 521; 621) 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.
Claims15
A spindle for driving a bung of a cartridge, said spindle comprising:
- a generally circular shaft having an outer surface, said generally circular shaft extending from a distal end to a proximal end of said circular shaft;
- 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.
Dependencies are inferred from the claim text.