Container for a medicinal liquid

A container for a medicinal liquid for use as an interchangeable cartridge in an inhaler, the container being gas-tight and liquid-tight, comprising:

• a foil bag being closed at both ends and which is collapsible at a differential pressure below 300 hPa (300 mbar), said foil bag having a welded seam for closing a first end of said foil bag wherein said welded seam extends substantially transversely with respect to the longitudinal axis of said foil bag and at least a portion of said welded seam extends partially in the longitudinal direction of said foil bag, wherein said foil bag plastically and irreversibly collapses in a predetermined manner such that said foil bag retains its initial length after emptying, and wherein said foil bag is made from a composite material, said composite material comprising an inner foil made of a copolymer, a diffusion-tight central layer, and an outer foil of a plastic material, wherein the melting temperature of said plastic material is higher than the melting temperature of said inner foil;
• a flange for sealingly closing a second end of said foil bag, wherein said foil bag is welded to said flange on a periphery thereof and having a guide passage formed therein, wherein said guide passage includes a press fit and/or a sealing location for sealingly fitting said container onto a discharge connection member of the inhaler, whereby the sealing location is required if the sealing effect of the press fit is not sufficient;
• a pierceable membrane being disposed at an end of or within said guide passage whereby said pierceable membrane is pierced by said discharge connection member when said container is positioned within the inhaler;
• and
• a casing made of a metal of plastic material, wherein said casing is connected to said flange so that said foil bag is disposed within said casing.