Technical skills and training of upper gastrointestinal endoscopy for new beginners

Figure 4 Basic technique. A: Up deflection; B: Down deflection; C: Left deflection; D: Right deflection; E: Push forward (red arrow) and pull back (blue arrow); F: Air inflation. Simple closure of hole in the Air/Water infusion button activates it, one is not required to push the button. If an endoscopist wishes to infuse air into lumen, he or she should close the hole of this button, and should not push the button; G: An example of air inflation; H: Air suction. If an endoscopist wants to suction air or fluid, he needs to push the suction button; I: An example of water suction.