Clinical Study of the Safety of a Single-port Endoscopic Surgical System for General Surgery

Inclusion Criteria: * 18 years \< age ≤75 years * Suitable for minimally invasive surgery * 18.5≤BMI≤28 kg/m2 * ASA score is Ⅰ-Ⅲ * Informed consent * Colon and rectal resection: colon and rectal polyps, inflammatory bowel disease, intestinal diverticula, colorectal cancer diagnosed cT3N0M0 with a maximum diameter of ≤4 cm located above the peritoneal reflection. * Partial gastrectomy: gastric stromal tumor, gastric giant ulcer. * Appendectomy: chronic appendicitis. * Cholecystectomy: chronic cholecystitis combined with gallbladder stones, gallbladder polyps (\> 1 cm). Exclusion Criteria: * With other malignancies or a previous history of other malignancies * Undergone other major surgical treatment within 3 months prior to enrolment or planned during the trial * With active tuberculosis * With severe systemic disease * With long-term use of anticoagulant and anti-platelet drugs (anti-platelet aggregation drugs discontinued less than 1 week prior to surgery), history of bleeding disorders or hematopoietic or coagulation disorders. * With severe allergies and suspected or established alcohol, drug or substance addiction * Patients who are immunodeficiency virus (HIV) antibody positive; hepatitis B surface antigen (HbsAg) positive and have a hepatitis B virus DNA (HBV-DNA) copy number above the lower limit of detection or normal range; hepatitis C virus (HCV) antibody positive; syphilis spirochete antibody positive and at high risk of transmission as judged by the investigator. * Emergency surgery * Women who are pregnant, breastfeeding or planning to become pregnant during the trial * Other conditions which, in the opinion of the investigator, make participation in this trial inappropriate.