A multicenter, randomized controlled trial for hand assisted laparoscopic, laparoscopic and robot-assisted radical resection of colorectal cancer

Interventions: Group 1:hand-assisted laparoscopic radical resection of colorectal cancer;Group 2:laparoscopic-assisted radical resection of colorectal cancer;Group 3:robot-assisted radical resection of colorectal cancer Primary outcome(s): height;weight;Surgical incision length;operation time;Intraoperative blood loss;Number of lymph nodes detected after operation;First exhaust time after surgery;Postoperative hospital stay;Postoperative complication rate;Reoperation rate;Mortality within 30 days after surgery;Intraoperative cost;Local recurrence rate;Disease free survival;Overall survival rate;Postoperative adjuvant chemoradiotherapy rate;First time out of bed after surgery;Time of first postoperative feeding;Time of first urethral catheter extraction after operation;The first time pulling drainage tube after surgery;Tumor staging and typing;Tumor site;Preoperative tumor markers;ASA sizing Study Design: Parallel