A hollow cylinder that is designed for oral insertion via the trachea and into a lung to maintain airway patency and/or to deliver anaesthetic inhalation agents or other medical gases, and secure ventilation. It is typically made of plastic, rubber, or silicone and may be packaged with a connector that attaches to a breathing circuit and is available in two basic configurations: 1) a double lumen tube with independent cuffs at the distal end for ventilation of the left or right bronchi; or 2) a twin lumen tube with independent cuffs for selective lung ventilation during thoracic surgery or postoperative care when independent lung ventilation is indicated. This is a single-use device.