Patent attributes
A medicament delivery device is presented having a body, an axially biased plunger rod provided with a first external thread, an activation member arranged to activate the plunger rod, a tubular medicament scale member receiving the activation member, which tubular medicament scale member is rotatable relative to the body and provided with a visual medicament dose scale, a stop nut that receives the plunger rod, where the stop nut is provided with an internal thread engaging with the first external thread of the plunger rod, and a gear train arrangement. The gear train arrangement couples the stop nut to the tubular medicament scale member for transferring rotational motion of the stop nut to the tubular medicament scale member to convey a measure of axial movement of the plunger rod to provide an indication, on the visual medicament dose scale, of an amount of expelled medicament.
