Table of Contents
Diagnostic and Therapeutic Endoscopy
Volume 5, Issue 2, Pages 131-135
Research Paper

A New Endoscopic Technique for Examination of Esophageal Stenosis: The Funnel-shaped Transparent Cap Technique

1Clinical Laboratory, Saitamaken-Saiseikai Kurihashi Hospital, Kouemon 714-6, Kurihashi-Cho, Kitakatsushika-gun, Saitama 349-1105, Japan
2Endoscope Technical Division, Toshiba Medical Co., Tokyo 113-8456, Japan
3Laboratory, Tokyo Women's Medical College Daini Hospital, Tokyo 116-0011, Japan

Received 25 May 1998; Accepted 18 June 1998

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We have devised a funnel-shaped transparent cap for the endoscopic diagnosis and treatment of stenosis in the digestive tract. This funnel-shaped cap is made of highly transparent methacrylic resin. A 73-year-old woman with reflux esophagitis (categorized as grade D by the Los Angeles Classification) visited our hospital with the chief complaint of dysphagia. She was examined using an endoscope equipped with a transparent vinyl chloride hood at its tip. Many pieces of food were found to be trapped in the esophagus. These were removed using tripod forceps or aspirated into the hood. The internal diameter of the stenotic segment was as small as 1 or 2 mm, and it was difficult to advance the endoscope past the stenosis. The endoscope was withdrawn, and the attached hood was removed and replaced with a transparent cap. This provided clear visualization of the mucosal surface of the stenotic segment, which could not be examined using any conventional device, permitting the stenosis to be relieved.