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THE ESOPHAGOSCOPE has been an instrument designed without due regard to the characteristics of the organ which it is intended to inspect; for example, there has been a tendency to design this instrument as if it were a half brother to a bronchoscope. A notable example is the Chevalier Jackson esophagoscope, which is practically a bronchoscope with the lateral perforations omitted.
The two types of instruments now in common use are the Chevalier Jackson (distally illuminated), in the United States, and the Negus (proximally illuminated), in England. Both these instruments have disadvantages. The Negus type is poorly illuminated at the distal end, as the lamp-carrying tubes are soldered into the sides of the esophagoscope, and do not accurately aline, the lights at the distal end. In the Chevalier Jackson instrument, the lamp-carrying and suction tubes are in such a position that the longest diameter of the instrument is anteroposterior, whereas
HENRY M. A NEW ESOPHAGOSCOPE. Arch Otolaryngol. 1948;48(6):688–689. doi:10.1001/archotol.1948.00690040702007