We performed endoscopic study with a thin gastrointestinal fiberscope, GIF-N230 in 19 patients. In 4 of them, GIF-XQ230 or GIF-Q200 couldn't pass through the esophagus or EC junction because of the stenosis or trismus. In these 4 patients, endoscopic study with GIF-N230 was successful. However, the images were less clear, the photographs were too small, and the cardia of the stomach was hard to see closely.
We concluded that GIF-N230 is useful particularly in patients who have the lumen too narrow for conventional endoscopes to pass irrespective of the above mentioned disadvantages.
