For direct Laryngoscopy, anaesthesia without endotracheal intubation provides easily surveyable, unobstructed working conditions in the larynx. Also, diagnosis of laryngeal disorders is much easier without laryngeal tube. Therefore, a new technique of direct Laryngoscopy without endotracheal intubation has been developped:
Modification of the injection anaesthesia account to Sanders for the Kleinsasserlaryhgoscope (wide lumen);
Development of an injection cannula by experiments with artificial thorax account to Draeger. The cannula measures 10 cm with a diameter of 3 mm and is fixed in the Kleinsasser apparatus. Air-flow under 1.8 atü at 5.5 em before the end of the laryngoscope. Pressure values in the artificial thorax 20 cm H2O.
Application of this newly developped injection anaesthesia on 20 patients. No complications during direct Laryngoscopy under artificial respiration by injection, anaesthesia by administration of Methohexital and relaxation induced by succinyleholin. Pressure values in the glottic region: 7–12 mm Hg. In 13 patients arterial blood gas analysis (pH, pO2, pCO2, base excess, standard bicarbonat) showed normal values before, during and after direct Laryngoscopy.