 Referring to this instrument as an "endoscope" (he is credited with coining this term), Desormeaux employed it to examine the urinary bladder.However, like Bozzini's lichtleiter, Desormeaux's endoscope was of limited utility due to its propensity to become very hot during use.In 1868, Adolph Kussmaul (1822–1902) of Germany performed the first esophagogastroduodenoscopy (a diagnostic procedure in which an endoscope is used to visualize the esophagus, stomach and duodenum) on a living human.