BILTON, Simon Lewis,PLUMPTRE, David Aubrey,JONES, Matthew,BUTLER, Joseph
申请号：
HK16111063.1
公开号：
HK1222816A
申请日:
2016.09.21
申请国别(地区):
HK
年份:
2017
代理人:
摘要：
A pen type drug injection device includes a housing, a dose dial member, a torsion spring 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 engaging a lead screw, a first clutch, and a second clutch. The first clutch couples the drive member and the housing, in a coupled state and allows relative rotation between them in a de-coupled state. The second clutch rotationally couples the drive member and the dial member in a coupled state and allows clockwise and anti-clockwise rotation between them in a de-coupled state. The second clutch includes a ratchet clicker with teeth having different tooth angles in the clockwise and the anti-clockwise direction, such that, in the de-coupled state, the teeth override each other with different resistance in opposite directions.
