Sources: A Manual Of Peroral Endoscopy And Laryngeal Surgery
The gastroscope is of the same construction as the
esophagoscope, with the exception that it is made longer, in order to
reach all parts of the stomach. In ordinary cases, the regular
esophagoscopes for adults and children respectively will afford a good
view of the stomach, but there are cases which require longer tubes,
and for these a gastroscope 10 mm. X 70 cm. is made, and also one 10
mm. X 80 cm., though the latter has never been needed but once.