Abstract: A portable positive pressure breathing apparatus includes a demand valve with a supply inlet port adapted to be connected to a pressurized source of oxygen and an outlet port adapted to be connected to the inlet of a patient's breathing appliance. The demand valve further includes a reference chamber and a valve assembly responsive to the reference chamber/appliance inlet pressure differential for connecting/disconnecting the inlet port to and from the outlet port. At least one manually adjustable back pressure regulator is connected to the pressure source and the reference chamber for setting the pressure in the reference chamber (and inlet to the breathing appliance) at a selected level above atmospheric pressure.

Abstract: A respiration system is provided, which has the greatest possible flexibility in operation based on a remote control (11), which is connected to a respirator (2) via separate data lines (9, 10) for display data and operating data. The display data are continuously displayed on both an operating unit (3) of the respiration system and the remote control (11). The operating data can only be entered either via the operating unit (3) of the respiration system or by the remote control (11).

Abstract: A gases transportation pathway for use in supplying a humidified gases stream to a patient includes regulated conduit heating. The regulated conduit heating may include a section of positive temperature coefficient material wherein the localized electrical resistance of the material is positively related to the localized temperature. The regulated conduit heating may be a layer of positive temperature coefficient material within the wall of the gases transportation pathway with at least a pair of conductors running the length of the pathway and in electrically conductive contact with the positive temperature coefficient material.