Surgical procedures(Control group ):A small periumbilical incision is made, with the location and orientation depending on the patient's body habitus and cosmetic considerations.The laparoscope is used to explore the abdomen for adhesions and potential injuries that may have occurred during port placement，ratcheted grasper is inserted through the lateral 5-mm port to retract the gallbladder fundus in cephalad fashion. An atraumatic grasper is inserted through the middle 5-mm port to retract the gallbladder infundibulum laterally, exposing the anteromedial aspect of the triangle of Calot. A hook cautery is used to carefully incise the peritoneum overlying the triangle of Calot, continuing along the medial aspect of the proximal gallbladder. As the infundibulum is retracted superomedially, peritoneum overlying the posterolateral aspect of the triangle of Calot is similarly incised using hook cautery. All remaining connective tissue is dissected out of the triangle of Calot using blunt dissection and hook cautery as needed to fully mobilize the gallbladder infundibulum.