Patent ID: 6666849
Filing Date: 2003-12-23
Classification: A61M

Abstract:
A dose setting device for medical injectors of the kind having a barrel with a front and a rear end and a rotary dose setting knob at the rear end of the barrel that can be indexed around from a zeroed position to bring an indicator opposite a mark on a scale, the device comprising an attachable and removable dose determining annular member adapted to be selectively attached on the dose-setting knob to fit retentively over the dose-setting knob in a selected one of a plurality of relative rotational positions each corresponding to a selected predetermined maximum dose, the annular member having an abutment which can co-operate with a raised stud on the barrel, rotation of the knob, together with the attached annular member, for dose setting being arrested by the abutment meeting the stud with the indicator opposite the selected dose mark, thus determining the selected maximum dose and preventing further rotation of the knob beyond the selected dose.