Prospective Comparison of Oral Intubation Via - Ambu® Aura Gain™ vs Slotted Guedel Tubus

Inclusion Criteria: * Aged ≥18 * ASA 1 -2 * Surgery of the shoulder, elbow, hand, hip, knee or foot * Signed consent form Exclusion Criteria: * Patients with expected difficulties regarding to the intubation * Patients with diseases / anatomical changes in the area of the pharynx, the larynx, the trachea, the esophagus or the stomach * Not sober * Increased risk of aspiration * BMI \> 35 kg/m2 * Acute disease which could affect the suitability of the anesthesia * Patients in which the use of a laryngeal mask is contraindicated or otherwise not possible * Patients with a disease which prevents an accurate examination of the patients (eg neuromuscular, mentally, metabolic disease) * Drug abuse in the recent past * Legal incompetence