Use of One Kind of Controllable Tube Ileostomy to Protect Anastomotic Leakage in the Low Rectal Cancer.

After low anterior resection(LAR), a double row of concentric purse-string sutures were placed in the ileum wall using 3-0 absorbable suture. The diameters of the purse-string rings were about 10 mm and 20 mm, respectively. The investigators then made a small incision within the inner purse-string and inserted the trachea cannula into the proximal end of the ileum. The inner purse-string suture then was tied, followed by the outer purse-string suture. The outer purse string should capsulate the inner purse string to prevent leakage. Normal saline was injected into the air bag until the ileum wall. The investigators will test the pressure of airbag, and control the pressure of airbag from 30-40cmHg. The investigators then pulled the cannula out through the abdominal wall. The incision site in the ileum was approximated to the inner abdominal wall and extraperitonized by fixing the mobilized ileum wall around the cannula to the inner abdominal wall. This was accomplished using 3-4 interrupted sutures.

In the CTI group, the tube will be removed after 3-4 weeks. If anastomotic leakage occurred, the investigators will test the airbag pressure and keep the pressure during 30-40cmHg. Because with time went on, the ileum will dilated , the airbag pressure will go down, then the feces may go through the airbag plane and flow into colon and the tube ileostomy will lose its defunctioning effect.When the investigators control the airbag pressure, we can control the defunctioning effect of tube stomy. So it is called controllable tube ileostomy. The investigators will keep the tube until the anastomotic leakage was cured.