Final answer:
The device that may prevent the need for an abdominoperineal resection by enabling a low anterior anastomosis is a stent. Stents can help maintain bowel integrity and allow for healing post-resection, potentially obviating the need for a colostomy bag.
Step-by-step explanation:
A device that may obviate the need for an abdominoperineal resection because a low anterior anastomosis can be performed is known as a stent. In this context, a stent could be placed in the intestine to maintain patency and allow for healing after a resection, thus potentially avoiding the need for creating a permanent colostomy.
A low anterior resection is a surgical procedure used to treat conditions of the rectum and lower colon where the cancerous part is removed while still maintaining the continuity of the bowel and avoiding a permanent stoma if possible. In cases where the anastomosis is too low in the rectum for a safe connection or where there is a risk of leakage, a stent may be utilized to assist in maintaining the integrity of the connection.
Other options like a trocar or a bougie are surgical instruments, but they are not typically employed to support anastomosis in bowel surgery. A colostomy bag is used if it is necessary to divert feces to an opening in the abdomen, but it is not a device that would prevent the need for an abdominoperineal resection by enabling a low anterior anastomosis.