The SIPS procedure, also called loop duodenal switch or the SADI procedure, is a modification of the standard duodenal switch operation designed to provide equivalent weight loss with less risk.
SIPS stands for Stomach Intestinal Pylorus Sparing, which means that ingested food still passes through the pylorus after a SIPS procedure. The pylorus is the valve at the bottom of the stomach that controls the rate of emptying of food into the small intestine. Preserving the pylorus has numerous advantages over a traditional duodenal switch, such as bile reflux gastritis, ulcers, and hypoglycemia/dumping syndrome. Also, using a loop of intestine to connect the stomach to rather than a traditional Roux limb, only one connection needs to be made which could potentially reduce the leak rate.