Elastic and sliding valvular joint, suitable to work in pre-filled syringes and said syringes

A pre-filled syringe having:

• (a) one internal chamber that stores a product to be injected, or
• (b) two internal independent chambers that contain isolated products, respectively, and which have to be mixed before injection,
• (c) an elastic and sliding valvular joint disposed inside a main body of said pre-filled syringe and configured and arranged to form a temporary closure blocking communication between (a) the one internal chamber and a communication channel towards an injection needle, or (b) between the two internal chambers, said elastic and sliding valvular joint comprising:
• first and second discoid cooperative elements, wherein the first of the discoid cooperative elements comprises a perimeter having an edge supported by an internal cylindrical surface of the syringe, wherein the second of said discoid cooperative elements is an elastic discoid plug, the first of said discoid cooperative elements forming a sliding discoid receiving seat comprising a central passage tube for receiving said elastic discoid plug, wherein the perimeter edge of the discoid receiving seat forms a rim that is thicker and less elastic than the rest of said discoid receiving seat,
• wherein the elastic discoid plug comprises an elastic base and a hollow closing cylinder with an open distal base formed from an internal face of the elastic base, the hollow closing cylinder optionally comprising a plurality of external flanges supported on a cylindrical surface thereof,
• wherein the central passage tube of the sliding discoid receiving seat faces said hollow closing cylinder and comprises an upper cylindrical cavity disposed in an opening of the central passage tube and a lower cylindrical cavity in communication with the upper cylindrical cavity, the central passage tube being configured so that the elastic discoid plug fits in a removable manner inside the central passage tube with the hollow closing cylinder of the discoid plug disposed in the lower cylindrical cavity and the elastic base of the discoid plug disposed in the upper cylindrical cavity surrounded by the perimeter edge of the discoid seat that forms the thicker rim,
• wherein, if the hollow closing cylinder does not comprise the plurality of external flanges, an outer diameter of the hollow closing cylinder of the elastic discoid plug is the same size as or is slightly bigger than an internal diameter of the lower cylindrical cavity and, if the hollow closing cylinder comprises the plurality of external flanges, the outer diameter of the hollow closing cylinder is dimensioned such that, with the hollow closing cylinder of the discoid plug disposed in the lower cylindrical cavity, the plurality of external annular flanges are supported by a cylindrical surface on the central passage tube of the sliding discoid receiving seat;
• and
• wherein the discoid cooperative elements of the elastic and sliding valvular joint are formable from an elastomeric material configured to be formed by either an injection process or by a compression process.