Greatcare Polyurethane Nasogastric Tube is a narrow-bore tube that goes through the nose into the stomach. It is used for short- or medium-term nutritional support and also for aspiration of gastric contents - eg, for decompression of intestinal obstruction. Use of a nasogastric tube is suitable for enteral feedings for up to six weeks. Polyurethane feeding tubes are not affected by stomach acid, so they can stay in the stomach longer than PVC tubes, which can only be used for up to two weeks. Customized Polyurethane Nasogastric Tube Manufacturer in China.