Abstract: A hose clamp (50) for a hose (18), inside which a different pressure prevails from that of its environment, and having two arms (28, 30) between which said hose (18) may be squeezed with different forces and thus the hose cross-section may be closed, is characterized in that the two arms (28, 30) are mutually movable transversely to the longitudinal axis of the hose (18), a bellows-like body (38) is arranged between the two arms (28, 30) in such a way that, by the expansion and compression of said body (38), the arms (28, 30) are movable in relation to each other and thus the hose (18) may be compressed to differing degrees, and the inside of the bellows-like body (38) may be connected to the hose (18) via a subsidiary line (48).

Abstract: A suction bottle for aspirating would secretions containing a small quantity of a pressure-adjusting liquid selected so that its vapor pressure conforms to a desired vacuum level. The vacuum level is maintained until the suction bottle is almost completely filled. If the liquid dissolves in the aspirated secretions, the vacuum level will decrease. The vacuum level can be varied by changing the temperature. The bottled can be made with thinner walls than bottles used heretofore because the risk of deformation during sterilizing is reduced as the inside pressure rises with the increase in temperature. For the purpose of connecting a suction bottle with a connecting tube joined with a wound draining system, provision is made for a connection system embodied as a suction controlling device.