Abstract: A flexible fluid guide unit (32) includes an inner tube (10), an outer tube (12), a spiral coil (11) between the inner tube (10) and the outer tube and a heating element (15.1, 15.2). The heating element heats the fluid carried by the inner tube. The coil extends around the inner tube. An outer surface of the outer tube comes into thermal contact with an environment and is smaller than the outer surface of the coil plus an uncovered part of an outer surface of the inner tube. The coil Shore hardness is at least 10 shoreA greater than the inner tube and outer tube Shore hardness. Or the coil is hollow and a wall of the coil has a wall thickness that is at least twice as great as the wall thickness of the inner tube and at least twice as great as that of the outer tube.

Abstract: A ventilation arrangement and a ventilation process provide ventilation for a patient. A first segment of a fluid guiding unit connects a fluid delivery unit to a valve (10). A second segment connects the valve (10) to a coupling unit on the patient side. A position of a valve body (19) of the valve (10) relative to a valve body seat (18) depends on an inlet pressure (P2) and on a control pressure (P1) and influences the volume flow (Vol?) through the second segment. An actuator (15) changes the control pressure (P1). A control signal (Sigcon) for the actuator (15) is generated with the objective of ensuring that the pressure or volume flow (Vol?) in the second segment assumes a predetermined value. A compensation signal (Sigcomp) for the actuator (15) is generated with the objective of preventing the valve body (19) from vibrating relative to the valve body seat (18).

Abstract: A connection device and process connect a patient-side coupling unit to a source/sink of a gas including oxygen. The connection device includes a valve device with a first valve (40.1) and with a second valve (40.2). A source-side fluid guide unit establishes a fluid connection between the source or the sink and the valve device. A patient-side fluid guide unit establishes a fluid connection between the patient-side coupling unit and the valve device. The valves are connected in parallel and are arranged between the two fluid guide units. A gas flows from the source through the first and/or second valve to the patient-side coupling unit or through the first and/or second valves to the sink. A control pressure is set at each valve. As a result, the time course of the volume flow downstream of the valve device follows a predefined time course.