Abstract: The present invention relates to a device for implementing an explorable stomach gastric bypass apt to be implanted in a patient who needs it. In particular, such device comprises a main body having at least one elastic portion made of silicone material and a covering element of the main body itself that in turn comprises an extensible portion. The extensible portion is positioned at the elastic portion and characterizes in that it comprises an excess of material compared to the size of the elastic portion itself.