Figure 1.

One-person technique and two-person technique. (A) One-person technique, in which the endoscopist independently maneuvers the endoscope during both insertion and retrieval. The endoscopist is responsible for adjusting the physical distance and movement direction in all dimensions. (B) Two-person technique, involving the collaboration of an assistant nurse. The assistant nurse holds the endoscope body at the insertion point and manages the forward and backward movement. Meanwhile, the endoscopist focuses on positioning the endoscope’s proximal tip at the colonic lumen’s center using control knobs.