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. 2017 Jul 16;9(7):304–309. doi: 10.4253/wjge.v9.i7.304

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©The Author(s) 2017. Published by Baishideng Publishing Group Inc. All rights reserved.

Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Newly developed dilator, ES Dilator^® (Zeon Medical Co., Tokyo, Japan), characterized by high pushability and lesser difference in diameters of the inner lumen and the guidewire. A: Tip of the ES Dilator; B: The ES Dilator has a lesser difference between the diameter of the inner lumen and that of the guidewire (upper figure), compared with traditional tapered catheters for ERCP (lower figure). ES Dilator: Endoscopic ultrasound-guided drainage; ERCP: Endoscopic retrograde cholangiopancreatography.