 Laparoscopic cholecystectomy is the most common laparoscopic procedure performed.In this procedure, 5–10 mm diameter instruments (graspers, scissors, clip applier) can be introduced by the surgeon into the abdomen through trocars (hollow tubes with a seal to keep the from leaking).Over one million cholecystectomies are performed in the U.S. annually, with over 96% of those being performed laparoscopically.