Along with more basic physiologic research in 1961, several new bronchoscopes chiefly in use in Europe have been designed. They have the advantage of facilitating endoscopic photography.By using a new method, additional findings concerning the aerodynamics of the larynx and trachea have been applied to vapor therapy in acute laryngotracheobronchitis. The technical difficulties of determining bronchial air flow to small pulmonary segments have been overcome to some degree by the use of special sampling tubes modified for use with rapid analyzers passed through the bronchoscope. Experimentally, deformities of the tracheal segments in infants can be produced by volume pressure and length tension changes which allow the collapse that is frequently observed bronchoscopically and radiographically, indicating that tracheal collapse need not be due to tracheomalacia or other structural abnormalities.6,14,28The ventilation bronchoscope of Friedel, which is a proximally-lighted instrument with a 2-way alternating valve to permit adequate ventilation,
PUTNEY FJ. Bronchoesophagology 1961. Arch Otolaryngol. 1962;75(4):377–380. doi:10.1001/archotol.1962.00740040386010
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