The invention relates to a device intended to break at least one closure element located inside a flexible tube, said closure element having a first part and a second part, said parts being separated by a weakening zone, it being possible to break said weakening zone in order to enable fluid to flow inside said flexible tube, said device comprising an assembly for holding said flexible tube, said assembly comprising a fixed element provided with a first housing intended to hold a first portion of said flexible tube, and a mobile element provided with a second housing intended to hold a second portion of said flexible tube, the two housings being aligned along a center line defining a neutral position of the mobile element, said device comprising a member for moving the mobile element to either side of its neutral position so as to be able to break the weakening zone of the closure element.
