Two-point lifting/retracting technology for transumbilical single-port laparoscopic cholecystectomy based on the anatomical features of Calot's triangle

Figure 1 Transumbilical single-port laparoscopic cholecystectomy using the two-point lifting/retracting technique. A: The gallbladder fundus is lifted superiorly; B: The gallbladder ampulla is retracted inferiorly and rightwards; C: A-the external puncture site is located at the 8-9^th intercostal space along the right midclavicular line; b-the external puncture site is located 5 cm below the right costal margin along the anterior axillary line; D: A-cystic duct; b-common bile duct; c-cystic artery.