A naso / orogastric device having a reflux blocking means, comprising: a naso / orogastric probe (101) having a feeding channel (913) to conduct a feeding content and at least one opening (905) to the along at least one segment of a lateral surface of said naso / orogastric tube, said naso / orogastric tube being sized and shaped to be disposed within the esophagus, so that said at least one segment is within the esophagus and at least one end distal thereof is in the lumen of a patient's stomach； at least one esophageal elastic body (103), located along said naso / orogastric tube, which has a pressure dependent volume； at least one esophageal sensor (102) comprising at least one impedance sensor, located in said at least one opening (905), and adapted to detect an impedance change in said at least one segment of said naso-orogastric probe when it enters in direct contact with gastrointestinal fluid (GI) that passes through the opening； a controller (106) adapted to regulate a pressure within said at least one esophageal elastic body in accordance with said detection.Un dispositivo naso/orogástrico que tiene un medio de bloqueo del reflujo, que comprende: una sonda naso/orogástrica (101) que tiene un canal de alimentación (913) para conducir un contenido de alimentación y al menos una abertura (905) a lo largo de al menos un segmento de una superficie lateral de dicha sonda naso/orogástrica, estando dimensionada y conformada dicha sonda naso/orogástrica para su disposición dentro del esófago, de modo que dicho al menos un segmento quede dentro del esófago y al menos un extremo distal del mismo quede en la luz del estómago de un paciente； al menos un cuerpo elástico esofágico (103), situado lo largo de dicho sonda naso/orogástrica, que tiene un volumen dependiente de la presión； al menos un sensor esofágico (102) que comprende al menos un sensor de impedancia, situado en dicha al menos una abertura (905), y adaptado para detectar un cambio de impedancia en dicho al
