Patent ID: 7316670

Claim:
An administering apparatus with a dosage display, comprising: a) a casing comprising a front casing section and a rear casing section, and a reservoir for a fluid product, wherein the front casing section and the rear casing section are plugged into each other along a common central longitudinal axis, in a non-releasable connection, whereby the front casing section and the rear casing section cannot be moved relative to each other, either axially or rotationally about the longitudinal axis; b) a driven device which acts on said product contained in said reservoir, in order to deliver product; c) a dosing means, using which a product dosage to be delivered can be selected, and which comprises a dosage scale with a number of dosage marks axially spaced out from each other; and d) a drive device coupled to said driven device for driving the driven device, said drive device performing a delivery stroke from an initial position, in a drive direction, up to a delivery stopper, the length of said delivery stroke counter to the drive direction being limited by selecting the product dosage by said dosing means; e) wherein said casing is transparent, at least in an area overlapping said dosage scale; f) the drive device carries an indicator marking, in order to indicate the initial position of the drive device through the transparent area of the casing, relative to said dosage marks; g) the driven device comprises a piston and a piston rod acting on the piston in the drive direction to deliver product from the reservoir by axially moving the piston in the drive direction, wherein the drive device is moveable counter to the drive direction as far as an adjustable dosing stopper, and the piston rod is prevented from moving counter to the drive direction and is coupled to the drive device such that it is slaved by the drive device in the drive direction; and wherein h) an outer surface of the piston rod comprises rows of teeth, the rear casing section comprising blocking elements which engage the rows of teeth such that the piston rod is permitted to move in an advancing direction but not counter to the advancing direction.