Patent ID: 10799643

Abstract:
A drive-control system for an injection device for delivering settable doses of a pharmaceutical substance contained in a cartridge (3), the system comprising a tubular housing body (2) having a longitudinal axis (A-A), a proximal end (2a) and a distal end (2b) connectable to the cartridge enclosure (3), the system further comprising a helical spring (7) contained in the housing body and a piston rod (6) moveable towards said distal end (2b) and blocked in translation towards the proximal end (2a). The housing body (2) further contains (i) a control sleeve (10) on which the spring (7) is mounted, the control sleeve (10) being rotatable around the axis (A-A), and (ii) a setting sleeve (11) translatable along the axis (A-A), wherein rotation of the control sleeve (10) in a first direction combined with compression of the spring (7) causes the setting sleeve (11) to be translated towards the proximal end (2a) of the housing body (2), and extension of the spring (7) causes the setting sleeve (11) to be translated towards the distal end (2b) of the housing body (2) and the control sleeve (10) to be rotated in a second direction and the piston rod (6) to be pushed towards the outside of the housing body (2). An injection device comprising the drive-control system according to the invention.