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A ventilating laryngoscope for inhalation anaesthesia and augmented ventilation during laryngoscopic procedures.

SUMMARY Two versions of a ventilating laryngoscope using principles of fluid amplification are described which provide means of augmented ventilation during laryngoscopic procedures under general anaesthesia and muscle relaxation with unobstructed views of the entire larynx. There is minimal attachment to the laryngoscope; in the simpler Type I venti-laryngoscope, there is only a driving gas line. For delivering inhalation anaesthetics and predetermined gas mixtures, an entrainment arm with reservoir bag is incorporated in the Type II venti-laryngoscope. Intravenous anaesthesia as well as inhalation anaesthesia can be used for laryngoscopy. Clinical experiences and laboratory data provide evidence of adequate ventilation and satisfactory anaesthesia during various laryngoscopic procedures. Flow and pressure measurements have been obtained to facilitate better understanding of the devices.