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After the rectum and its mesorectum were dissociated, the rectum was transected at 2 cm below the tumor by using a linear stapler. Then the rectal stump was incised and disinfected with iodophor, the protective sleeve was placed into the abdominal cavity through the assistant hole. An assistant delivered oval forceps into the pelvic cavity through the anus and used oval forceps to grip one end of the protective sleeve. Then slowly pulled out the protective sleeve. Eventually, one end of the protective sleeve was placed inside the abdominal cavity and the other outside the anus, completely covering the rectal stump and the perianal area. Tumor was pulled out of the rectal stump, then the colon was then disconnected at 10 cm above the tumor. The anvil was placed into the stump of the sigmoid colon and disinfected with iodophor, and then the anvil was delivered into the abdominal cavity. Place a circular stapler through the anus for end-to-end anastomosis of the rectum and sigmoid colon.

After the rectum and its mesorectum were dissociated, the rectum was transected at 2 cm below the tumor by using a linear stapler. Take a 6cm incision through the rectus abdominis muscle in the lower left abdomen and place an incision protective cover. Cut off the intestinal tube 10cm from the upper edge of the tumor and place a stapler base. The rectal stump was sutured with purse-string suture. Place a circular stapler through the anus for end-to-end anastomosis of the rectum and sigmoid colon. After completion of digestive tract reconstruction. The pelvic and abdominal cavities were washed repeatedly with normal saline until there were no blood remained. Close the abdominal cavity layer by layer.