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laparoscopy incisional hernia mesh repair ergonomics diathermy injury acute abdomen ensel ligasure bipolar energy sources appendicectomy ports gastroenterology surgical signs clinical signs wound infection hai ssi surgical site infection trocar injury pneumoperitoneum complications of laparoscopy bile duct injury. laparoscopic cholecystectomy sterilization of instruments intestinal obstruction tips for endoscopy basic endoscopy steps of gastroscopy heller's myotomy poem gerd achalasia pseudocyst pancreas bile duct stone ercp mrcp cbd exploration ipom prosthesis tapp tep anatomy of inguinal canal inguinal hernia tissue approximation laparoscopic suturing ergonomics in laparoscopy suturing zone 2 injury harmonic device coccoon