Single-port Robotic Transanal Total Mesorectal Excision

This is a phase 2a clinical trial based on the IDEAL framework to evaluate the safety, feasibility and clinical efficacy of single-port robotic transanal total mesorectal excision (SPr-taTME )surgery. For safety, intraoperative adverse events and 30-day morbidity. For efficacy, successful completion of predefined procedural steps without conversion. The transanal surgical platform consists of a single-port robotic system, while the transabdominal approach can be performed laparoscopically or with single-port robotic assistance.