Demonstration of a new gastroscope, the fiberscope. Leonidas Berry was a pioneer in the development and use of the gastroscope. The area may need to be dilated to allow the gastroscope to pass. In 1881 he developed improved models of the esophagoscope and gastroscope. Endoscopic retrieval involves the use of a gastroscope or an optic fiber charge-coupled device camera. Abnormal tissue seen in a gastroscope examination will be biopsied by the surgeon or gastroenterologist. The StomaphyX device is designed to go down into the stomach with the gastroscope.