Improvements in and relating to drive mechanisms suitable...

Details Improvements in and relating to drive mechanisms suitable... Improvements in and relating to drive mechanisms suitable...

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2518011

The invention relates to a drive mechanism for use in a drug delivery device comprising: a housing (2); a dose dial sleeve (40) having a helical thread of a first lead; and a two-part piston rod (14). The said two-part piston rod (14) comprises an outer part (18) having a helical thread of a second lead and an inner part (16) having a helical thread of a third lead, whereby the first lead of the thread of the dose dial sleeve (40) is equal to the sum of the second lead of the thread of the outer part (18) of the piston rod (14) and the third lead of the thread of the inner part (16) of the piston rod (14).

La présente invention a trait à un dispositif de commande destiné à être utilisé dans un dispositif d'administration de médicaments comportant : un corps (2), un manchon de composition de doses (40) comprenant un filet en spiral d'un premier pas hélicoïdal, et une tige de piston en deux parties (40). Ledit piston en deux parties (14) comporte une partie externe (18) comprenant un filet en spirale d'un deuxième pas hélicoïdal et une partie interne (16) ayant un filet en spirale d'un troisième pas hélicoïdal, le premier pas hélicoïdal du filet du manchon de composition de doses (40) étant égal à la somme du deuxième pas hélicoïdal du filet de la partie externe (18) de la tige de piston (14) et du troisième pas hélicoïdal du filet de la partie interne (16) de la tige de piston (14).

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