Central South University in collaboration with Tianjin University developed the first domestically produced Chinese minimally invasive surgical (MIS) robot system which named "Micro Hand S" in 2013. Recently, as the domestic surgical robot research project's main section, this new MIS robot had been authorized to enter the clinical trial stage by the Ethics Committee of the Third Xiangya Hospital at Central South University.

One surgeon perform these surgical trials using the robot "Micro Hand S". All of the patients were followed for 12 months, and pre- and postoperative changes in blood route test and hepatorenal function examination, surgery duration, hospital stay, total robotic setup time, total robotic operation time, intraoperative blood loss, total postoperative drainage amount, duration of bearing drainage tubes were recorded. In addition, the pre- and postoperative changes in the pathological and functional outcomes were measured.

Inclusion Criteria:

• diagnosis of gastric tumor, colorectal tumor, acute cholecystitis and ileocecal tumor respectively
• 18years\