Drive assembly and medication delivery device

Details Drive assembly and medication delivery device Drive assembly and medication delivery device

A - Human Necessities

61

M

A61M 5/20 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2749219

A drive assembly suitable for a medication delivery device (101) comprises a housing (110), a drive member, a piston rod, a rotation sleeve, a guide member (130) and a biasing member (160). The rotation sleeve (140) is arranged to be displaced in a distal di-rection when the drive member (120) is displaced in the distal direction by mechanical in-teraction of the drive member (120) and the rotation sleeve (140) with the rotation sleeve (140) and the drive member (120) both being guided axially by the at guide member (130). The biasing member (160) exerts a force on the rotation sleeve (140) acting in the proximal direction, said force being transformed into a rotational movement of the rotation sleeve (140). The rotational movement of the rotation sleeve (140) being transformed into a rota-tional movement of the piston rod (150).

L'invention porte sur un ensemble d'entraînement approprié pour dispositif d'administration de médicament (101), ledit ensemble comprenant un boîtier (110), un élément d'entraînement, une tige de piston, un manchon de rotation, un élément de guidage (130) et un élément de sollicitation (160). Le manchon de rotation (140) est agencé pour être déplacé dans une direction distale lorsque l'élément d'entraînement (120) est déplacé dans la direction distale par interaction mécanique de l'élément d'entraînement (120) et du manchon de rotation (140), le manchon de rotation (140) et l'élément d'entraînement (120) étant tous deux guidés axialement par le ou les éléments de guidage (130). L'élément de polarisation (160) exerce une force sur le manchon de rotation (140) en agissant dans la direction proximale, ladite force étant transformée en un mouvement rotatif du manchon de rotation (140). Le mouvement rotatif du manchon de rotation (140) est transformé en un mouvement rotatif de la tige de piston (150).

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