Bilton, Simon Lewis,Plumptre, David Aubrey,Jones, Matthew,Butler, Joseph
申请号：
AU2014317147
公开号：
AU2014317147A1
申请日:
2014.09.03
申请国别(地区):
AU
年份:
2016
代理人:
摘要：
The present invention relates to a pen type drug injection device (1； 101) comprising a housing (4, 5； 104, 105), a dose dial member (6； 106), a torsion spring (12； 112) fixed between the housing and the dial member such that energy is accumulated in the torsion spring upon rotation of the dial member relative to the housing, a drive member (8； 108) engaging a lead screw (9； 109), a first clutch (18； 118) rotationally coupling the drive member (8； 108) and the housing in a coupled state and allowing relative rotation between the drive member and the housing in a de-coupled state, and a second clutch (19； 119) rotationally coupling the drive member and the dial member in a coupled state and allowing relative clockwise and anti-clockwise rotation between the drive member and the dial member in a de-coupled state. The second clutch comprises a ratchet clicker with teeth (19a, 19b； 119a, 119b) having in the clockwise and the anti-clockwise direction different ramped tooth angles such that the teeth are allowed to override each other in the de-coupled state of the second clutch with a different resistance in the clockwise and the anti-clockwise direction, such that a dose can be set and also corrected by the user thereby tensioning respectively relaxing the torsion spring.
