A breathing tube for humidified gases ventilation system has an internal conduit and a surrounding conduit within which the internal conduit is disposed. A connector at one end of the internal conduit and the surrounding conduit has an inhalation gases port for connection to an inhalation gases supply...http://www.google.de/patents/US6536428?utm_source=gb-gplus-sharePatent US6536428 - Ventilation system and/or breathing tube
