A METHOD AND DEVICE FOR DOSING A LIQUID PREPARATION

摘要

A liquid preparation of a pharmaceutically active agent having a defined composition is repeatedly dosed from a multi-dose container having a defined vo- lume. The amount dosed is selected as 1 /N of the volume of the multi-dose c on- tainer, N being an integer having a value of 2 or higher. A device for dosin g a li- quid preparation comprises a holder (1) for a multi-dose container (2), whic h has a movable rear wall (5) acting as a piston for expelling the liquid preparatio n (6) from the container, and a piston rod (7) which is provided with releasable block- ing means (11,14,19, 22), such that the movement of the piston rod is limite d to a preset length (35) corresponding to an expelled volume of 1/N of the volume of said multi-dose container, N being an integer having a value of 2 or higher. A pre- ferred embodiment of the device is as an injection device for repeated parenteral injections from an injection cartridge.