Endotracheal tubes with balloons (cuffed) deform the circulation of air by applying pressure on the walls of the trachea and cause numerous complications. In the endotracheal tube analyzed in the invention, the valve system in the form of flexible membrane is used instead of balloons, during each expiration, the pressure on the trachea wall is decreased and the disorder of getting blood occurring in the mucosa of the trachea was prevented. Moreover, the leaking of the liquid contents coming from in-mouth and stomach into the lungs and the formation of bacteria and the risk of infection was decreased through ventilating the trachea in a more physiological manner.
