Why does the ligation of superior hemorrhoidal artery use the eight-character method?

To prevent secondary bleeding after hemorrhoidectomy. For prolapse and bleeding are obvious, we can sew an extra figure when ligating hemorrhoid artery, and the figure-eight method for ligation of superior hemorrhoid artery can play a suspending role in preventing secondary bleeding after hemorrhoid operation and solve the problems of bleeding and prolapse at the same time. Ligating the distal branch of the superior rectal artery reduces the blood flow into the hemorrhoid, and the "8" suture of the 2-3cm hemorrhoid artery on the dentate line also plays the role of suspending and fixing the hemorrhoid to the anorectal muscle layer.