Patent ID: 8662076

Claim:
A capsule, for use as reservoir for pharmaceutical preparations in powder inhalers, comprising two capsule elements each open on one side, the elements being a capsule body and a capsule top the relative sizes of the elements allowing them to be inserted telescopically into each other via their openings so that a stable, sealed cavity of defined volume is formed, wherein: the capsule elements are of a non-water-soluble plastic material, two annular channels lying behind one another relative to the opening, running peripherally around a first capsule element are formed on the inside or outside of the first capsule element in the vicinity of its opening and two annular raised sections lying behind one another relative to the opening, running peripherally around the other capsule element are formed on the outside or inside of the other capsule element in the vicinity of its opening, provided that when the annular channels are formed on the inside of the first capsule element then the raised sections are formed on the outside of the other capsule element and the other capsule element fits inside the first capsule element and that when the annular channels are formed on the outside of the first capsule element then the raised sections are formed on the inside of the other capsule element and the first capsule element fits inside the other capsule element, and further provided that the raised section furthest from the opening is continuous around the capsule element and is higher and/or wider and/or has more surface area than the raised section closest to the opening and the raised section closest to the opening is optionally segmented, the raised sections and the annular channels being positioned correspondingly such that the two raised sections catch within the two annular channels upon the telescopic closure of the two capsule elements, the first raised section closest to the opening of the other capsule element and the first channel closest to the opening on the first capsule element, capable of forming a pre-seal of the elements when the first raised section catches within the first channel, the opening of which by pulling apart the two capsule elements requires a first force, and the second raised section furthest from the opening of the other capsule element and the first channel on the first capsule element capable of forming a main closure when they catch within each other, the opening of which by pulling apart the two capsule elements requires a second force, and the first force to be applied for opening is smaller than the second force.