Injector with Thumb Operable Scroll Wheel

An injector, comprising:

• a housing, comprising a rear housing and a front housing, wherein the front housing is slidably arranged inside the rear housing;
• a medicament container, being disposed inside the front housing and comprising a first chamber containing a first agent, a second chamber containing a second agent, a rear stopper, and a divider stopper;
• a front opening configured for an injection needle for delivering the medicament therethrough;
• a drive unit slidably arranged within the housing and configured to act on the container for expelling medicament through the needle;
• and
• a scroll wheel member attached to the rear housing and rotatable around an axis generally perpendicular to a longitudinal axis of the injector, wherein the scroll wheel member is operatively connected to the front housing via a transmission and the scroll wheel member comprises a friction enhancing device such that the scroll wheel member is maneuverable with a finger of a user for mixing a medicament.