Spindle for a drug delivery device

Details Spindle for a drug delivery device Spindle for a drug delivery device

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2761505

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.

Linvention concerne une tige (242; 414; 542; 642) d'entraînement d'une bonde de cartouche, qui comprend un arbre généralement circulaire présentant une surface extérieure (560). Cet arbre s'étend d'une extrémité distale à une extrémité proximale. Une première rainure hélicoïdale (219; 519; 619) est ménagée le long d'une première partie de la surface extérieure, et présente un premier pas. Une seconde rainure hélicoïdale (221; 521; 621) est ménagée le long d'une seconde partie de la surface extérieure de l'arbre et chevauche la première rainure hélicoïdale. La seconde rainure hélicoïdale présente un second pas.

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