Comparison Between a Standard Tube and the Ultra-thin Tritube for Intubation of the Trachea and for Maintaining Access to the Trachea After Anaesthesia, in Patients With an Expected Difficult Direct Laryngoscopy

Inclusion Criteria: * Patients for anaesthesia for surgery in the Head-/neck/ear/nose/throat * planned for oral intubation with video-laryngoscopy * with risk factors for difficult direct laryngoscopy Exclusion Criteria: * Patient with increased secretions in the airway (Pneumonia, bronchitis, productive cough) * Patients planned for awake intubation * Patients where mask-ventilation is judged to could become impossible * Patients where access to the cricothyroid membrane is judged to be difficult or impossible * Patients in ASA (american Society of Anaesthesiologists) physical classification status \>3 * Patients who are scheduled for rapid sequence induction (RSI) due to risk of aspiration * Patients with stridor * Patients with hypoxemia (Saturation \< 90 % in room air) * Operation duration planned to \> 2.5 hours * Patients with the need for a nerve-stimulation-tube during surgery