What is the purpose of the "j port" in a GJ tube?

The purpose of the "j port" in a GJ (gastrojejunostomy) tube is for feeding. The GJ tube consists of two lumens: the gastric port and the jejunal port. The jejunal port, or "j port," is placed in the jejunum, which is the second part of the small intestine. This design allows for the direct delivery of nutrients into the jejunum, bypassing the stomach.

This method is particularly beneficial for patients who have difficulty tolerating feeds in the stomach due to conditions such as gastroparesis or those who are at risk for aspiration. Nutritional support can thus be effectively and safely provided through the jejunal port, ensuring that the patient receives the necessary calories and nutrients.