Figure 4From: A novel single-port laparoscopic operation for colorectal cancer with transanal specimen extraction: a comparative studyPrerequisites of transanal specimen extraction using our method. A Anal trocars. They are metal cylinders with a range of diameters (3–6 cm) that are designed for specimen extraction via the anal canal. B An anvil with an anchor suture. The tip of the anvil was anchored with the aim of facilitating an intracorporeal purse-string suture.Back to article page