TRAINING MECHANISM FOR DRUG DELIVERY DEVICE

摘要

The present invention relates to a cartridge for a drug delivery device comprising: a body (32) of substantially cylindrical shape, a piston (10) slidably disposed in the body (32) along two opposite axial directions, along a distal (24) and along a proximal direction (26), at least one friction means (14) operably engaged with the piston (10) to generate a pre-defined friction force between the piston (10) and an inside wall (36) of the body (32), when the piston (10) is displaced relative to the body (32), wherein in response to an axial displacement of the piston (10) relative to the body (32) in distal direction (24) and in proximal direction (26), the at least one friction means (14) is adapted to generate respective proximal and distal friction forces that are different in magnitude.