Abstract: The suction device comprises a suction vessel with a cover, the latter be provided with a projecting member. A rubber-like elastic membrane is fixedly mounted onto the top part of the projecting member. The cover comprises a first connector having its passage connected with the inner space of the suction vessel, and a second connector having its passage connected with a chamber bounded by said projecting member and the membrane. The two connectors are connected with each other by means of a connecting hose, shortly before evacuating the inner space of the suction device, at the latest, with the result, that the same negative pressure will prevail in the chamber as in the inner space of the suction device. For carrying out the wound drainage the connecting hose is detached from the connector pertaining to the chamber and is connected with a suction conduit leading to the wound.

Abstract: The neck of a bottle is closed and sealed by a one-piece cap having a cylindrical portion which surrounds the neck, a deformable end wall which extends across the open end of the neck, and a flexible hose which is integral with the end wall. The outer side of the end wall has a diametrically extending projection consisting of two discrete sections having flat elongated outer surfaces which are parallel to each other when the pressure in the bottle equals the pressure of the surrounding atmosphere and which are inclined with respect to each other when the pressure inthe interior of the bottle is reduced below atmospheric pressure. The person observing the surfaces of the two sections can ascertain the presence and absence as well as the extent of pressure differential between the interior and exterior of the bottle.

Abstract: The neck of a bottle is closed and sealed by a one-piece cap having a cylrical portion which surrounds the neck, a deformable end wall which extends across the open end of the neck, and a flexible hose which is integral with the end wall. The inner side of the end wall has an annular bead which sealingly engages the inner surface of the neck when the pressure in the interior of the bottle is reduced below atmospheric pressure. An annular groove at the inner side of the end wall surrounds the bead and communicates with the atmosphere by way of at least one channel in the cylindrical portion. The groove communicates with the atmosphere during expulsion of air from the bottle, for example, in response to heating, but is sealed from the interior of the bottle when the end wall bulges inwardly and maintains the bead in sealing engagement with the neck.