Here's how modern surgeons disconnect and ligate vessels simultaneously In the animation of the endoscopic coagulator, it "cauterizes" the tissue, which ensures perfect dissection of small vessels. It can also be used to coagulate bleeding vessels, which is much faster and easier than ligation (ligation). However, large vessels must still be ligated before dissection, otherwise there is a high risk of bleeding. Therefore it is first stitched at both ends and the area between them is "cauterized" - finished✔️