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Surgical and medical navigation systems for determining the positioning and orientation of enteral tubes; medical device for enteral feeding; medical device for vascular access; surgical and medical navigation system comprised of sensors, computer software, an electromagnetic field generator, a processor, and a screen, for determining and displaying the positioning of enteral tubes in a patient's body; medical device for reducing gastric reflux and detecting malpositioning of enteral feeding tube; medical integrated camera for nasogastric aspiration tubes; camera for placing a nasogastric tube in a patient's esophagus