Comparison of a Single Use (Ambu aScope) and a Reusable Flexible Optical Scope for Intubation Through a Supraglottic Airway Device (Aura-i)

Inclusion Criteria: * ASA physical status 1-3 and evaluated pre-operatively and found suitable for tracheal intubation with a flexible optical scope via the SAD and scheduled for elective surgery/anesthesia and are conscious about their rights and consequences of participating in the study. * The patient must have one or two of the following predictors of difficult tracheal intubation: 1. Modified Mallampati score \> 2 (= "no parts of the Uvula is visible") 2. a thyromental distance of less then or equal to 6.5 cms 3. Combined movement in head and neck \< 90 degrees 4. Mouth-opening less the 4 cm (but must be larger then 2.5 cm) 5. Inability to protrude the teeth n the lower jaw beyond the upper incisors 6. BMI \> 40 combined with a neck-circumference \> 43 cms 7. Upper-lip-bite-test \> 2 8. Previous difficult intubation or laryngoscopy (If more then two criteria are fulfilled the patient should be considered intubated awake instead. . But the upper-lip-bite-test and the prognation-beyond the incisors test represents a similar thing, namely the inability to sub-luxate the lower jaw, the if both these findings are positive it is only considered as counting for one. Exclusion Criteria: * ASA physical status 4 or 5 * contraindications for use of the SAD * Patients in whom intubation via a SAD has previously failed * Patients at risk of aspiration from the gastrointestinal channel * diseases in mouth, pharynx or larynx that precludes the use of a SAD * Patients in whom the cricothyroid membrane cannot be localized preanaesthetically * Patients in whom the doctor making the pre-anaesthetic evaluation finds in need of an awake intubation * Patients with possible Creutzfeldt-Jacobs disease or contraindication against the use of non-autoclavable equipment r risk of cross contamination with prions