What device is used to aid in the expulsion of flatus (gas) from the rectum?

The rectal tube is specifically designed to facilitate the release of gas and relieve discomfort caused by the buildup of flatus in the rectum. This device is inserted into the rectum to create a pathway for gas to exit the body, which can provide significant relief for patients experiencing bloating or gaseous distension.

In contrast, an enema is primarily used for introducing liquid into the bowel to stimulate a bowel movement or to cleanse the colon, rather than for the expulsion of gas. A catheter is typically used for draining urine from the bladder and is not suitable for gas expulsion. A colonoscope is an instrument used for examining the interior of the colon and rectum, often during a colonoscopy, but it is not intended for the purpose of gas removal. Thus, the rectal tube is the most appropriate device for aiding in the expulsion of flatus.