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The NaviAid™ AB (Advancing Balloon) device provides easy and fast Ileoscopy / upper enteroscopy while using standard endoscopes. It is an on-demand device, which can be introduced through the tool channel of the endoscope during the procedure (colonoscopy or EGD) upon physician's decision, without the need for pre-mounting or interrupting the normal course of examination. Once inflated ahead of the endoscope and anchored in the bowel, the device is used as a rail on which the endoscope is advanced, replacing pushing by guidance. Multiple advancement steps may be performed as needed, facilitating deep, fast and safe intubation in the small bowel. The device may be removed from the endoscope's tool channel during procedure to allow biopsy and therapy, and be then re-inserted to facilitate further advancement.