| 摘要 |
The sachet is made of a gas-impermeable flexible material. The device has a hollow chamber (2) which is enclosed by (a) a concave, cylindrically curved wall surface (20) attached at its longitudinal side to a flat attachment of the flat sachet, and (b) two convexly curved wall surfaces (22,23) facing one another and joined at their distal sides to an inward bend of opposing edge sides (131) of the cylindrically curved wall surface. The distal wall surfaces (22,23) are curved so as to be dissymmetrical. A further wall surface (21) enclosing the hollow chamber is located opposite the concave wall surface.
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