Under full anesthesia, gastroscopy will be performed and a guide wire will be inserted to the jejunum. The Endobarrirer device will be inserted over the guide wire and introduced into the duodenal bulb. Under fluoroscopy the device will be operated and the sleeve will be released from its capsule. Contrast material will be injected thorough the sleeve to insure full opening. After full expansion of the sleeve, the anchoring mechanism will be operated and the sleeve will be anchored by small hooks to the duodenal bulb. Correct hooking will be visualized endoscopically.