This invention discloses a system for safe and non-traumatic insertion of a nasogastric tube, said system comprises of a nasogastric tube and a curved rubber nasopharyngeal sheath, long enough to reach the hypopharynx from the nostrils. Said sheath has two longitudinal tear-off lines over its full length...http://www.google.es/patents/US7604627?utm_source=gb-gplus-sharePatente US7604627 - Nasopharyngeal sheath for nasogastric intubation
