PEN-TYPE INJECTOR WITH DOSE DIAL SLEEVE

摘要

The invention relates to a pen-type injector comprising a housing; a piston rod (20) adapted to operate through the housing; a dose dial sleeve (70) located between the housing and the piston rod (20), the dose dial sleeve (7 0) having a helical thread of first lead; a drive sleeve (30) located between t he dose dial sleeve (70) and the piston rod (20), the drive sleeve (30) having a helical groove (38) of second lead. The first lead of the helical thread and the second lead of the helical groove (38) are the same.