Anastomosis by the double stapling technique.
(a) The staple at the stump of the oral side intestine is excised.
(b) Purse string suture using 2-0 prolene (Ethicon) in the abdominal cavity.
(c) Inserting the anvil head into the open stump.
(d) Tying the thread and fixing the anvil head. A circular endostapler (intraluminal stapler/ILS, Ethicon) is introduced through the anus, and anastomosis is performed.