Tube enterostomy, or tube feeding, is a form of enteral or intestinal site feeding that employs a stoma or semi-permanent surgically placed tube to the small intestines.

Many patients are unable to take in food by mouth, esophagus, or stomach. A number of conditions can render a person unable to take in nutrition through the normal pathways. Neurological conditions or injuries, injuries to the mouth or throat, obstructions of the stomach, cancer or ulcerative conditions of the gastrointestinal tract, and certain surgical procedures can make it impossible for a person to receive oral nutrition. Tube feeding is indicated for patients unable to ingest adequate nutrition by mouth, but who may have a cleared passage in the esophagus and stomach, and even partial functioning of gastrointestinal tract. Enteral nutrition procedures that utilize the gastrointestinal tract are preferred over intravenous feeding or parenteral nutrition because they maintain the function of the intestines, provide for immunity to infection, and avoid complications related to intravenous feeding.

Tube enterostomy, a feeding tube placed directly into the intestines or jejunum, is one such enteral procedure. It is used if the need for enteral feeding lasts longer than six weeks, or if it improves the outcomes of drastic surgeries such as removal or resection of the intestines. Recently, it has become an important technique for use in surgery in which a gastroectomy—resection of the intestinal link to the esophagus—occurs. The procedure makes healing easier, and seeks to retain the patient's nutritional status and quality of life after reconstructive surgery. Some individuals have a tube enterostomy surgically constructed, and successfully utilize it for a long period of time.

From http://www.surgeryencyclopedia.com/St-Wr/Tube-Enterostomy.html