The circular staples are also known as EEA devices and are typically used for connecting one vessel to the side of a larger vessel. The medical term for this procedure is called end-to-end anastomosis. End-to-end anastomosis is performed after bowel resection. Bowel resection is a surgical procedure that removes a diseased part of the large intestine. The circular staples are used to close the wounds. According to the Science Direct website, circular staples can be used to perform cervical esophagogastric anastomosis after the removal of cancer cells in the area, instead of the typical hand-sewn method. Using the circular staples can result in shorter surgery time.