| 摘要 |
The apparatus for dispensing a medium comprises a cartridge in which a piston is movably receivable. An outlet is arranged in an outlet face of the cartridge for conveying the medium into a storage chamber of the cartridge. The piston comprises a conveying side, a drive side disposed opposite the conveying side and at least one seal arranged at a side wall of the piston for providing a fluid-tight sealing between the piston and an inner cartridge wall. The cartridge comprises at least one protrusion and/or at least one recess. The protrusion or the recess and the piston are arranged such that they can engage in such a way that, when the piston is arranged in a filling position, substantially no gas can be trapped between the outlet face, the conveying side of the piston and the seal facing the outlet face. |
