Remote-controlled Capsule Endoscopy: a Feasibility Study

Inclusion Criteria: * upper abdominal symptoms (≥1 year ) * surveillance gastroscopy for known gastric ulcer or polyps * history of gastric ulcer or polyps （≤1w）at Nanfang Hospital were enrolled. Exclusion Criteria: * dysphagia * suspected or documented digestive tract malformation ,obstruction, strictures or fistula * acute upper GI bleeding, acute enteritis, acute ischemia disease * history of abdominal operations * impaired renal function, congestive heart failure * patients with critical condition or mental illness * patients with, known allergy to polymer material or antifoam agent * patients with cardiac pacemakers or other implanted electromedical devices，magnetic resonance imaging ( mri) examination in 7 days * pregnancy