Fillable 3D flexible pouch for biopharmaceutical fluids, and method for producing such a pouch

A 3D flexible pouch to be filled with a biopharmaceutical product, the flexible pouch being designed to be deployed from an empty, flat configuration towards a substantially parallelepiped configuration in a filled state, the flexible pouch comprising:

• a first wall element consisting of a film and defining a front face, the first wall element having two side edges distributed on either side of a longitudinal axis of the pouch in the flat configuration;
• a second wall element consisting of a film and defining a rear face, the second wall element having two additional side edges distributed on either side of said longitudinal axis of the pouch in the flat configuration;
• a first gusset and a second gusset, each connected to one of said side edges of the first wall element and one of said additional side edges of the second wall element, the first gusset and the second gusset each being constituted by respective films cut out from one piece and each being foldable along a folding line towards the inside which extends between two opposite ends of the flexible pouch;
• the longitudinal axis of the flexible pouch extending between the folding line of the first gusset and the folding line of the second gusset in the flat configuration;
• and
• at one of the two opposite ends, the films respectively constituting the first wall element and the second wall element are directly welded to one another, so as to define a join portion common to the side edges which, in the flat configuration, projects axially towards the outside with respect to the first and second gussets and is defined by two oblique edges which are oblique with respect to the longitudinal axis.