Metering device for dispensing medication fluid

A metering device (D) for dispensing medication fluid, said metering device (D) comprising:

• a) a spindle unit (S) having a constant spindle pitch (p);
• b) a drive unit (M) for rotational driving of the spindle unit (S);
• c) a reservoir (A) for the medication fluid, wherein the reservoir (A) has a wall (3), which defines a cross-sectional area (Q) of the reservoir (A);
• and
• d) a plunger (K) situated in the reservoir (A), wherein the rotational driving of the spindle unit (S) causes a translational movement of the plunger (K) so that the plunger (K) is movable relative to the wall (3) of the reservoir (A) for displacement of the medication fluid,
• characterized in that the product of the cross-sectional area (Q) of the reservoir (A) in units of mm2 and the spindle pitch (p) of the spindle unit (S) in units of mm/angular degree is less than 0.13 mm3/angular degree, and the medication fluid is a liquid insulin in a concentration in a range of U20 to U100.