balloon assisted enteroscopy

endoscopy esophagus endoscopic single balloon gastric stomach muscle system duodenum procedure achalasia minimally vector gastroscopy invasive disorder mucosa submucosa gastrointestinal intestine insertion bowel inflated tool endoscope esophageal les tunnel nonsurgical sphincter fibers stricture anatomical junction digestive gastroenterologist illustration silhouette human body colon examination enteroscopy therapy gastroesophageal tiny small air