Mixer for biphasic compounds, comprising a chamber (21) for containing a solid phase (22) and a cartridge (4) containing a phial (18) of a liquid phase (27), said chamber (21) and said cartridge (4) being able to communicate through respective channels (19, 20), said cartridge (4) comprising an external casing (25) made in a deformable material and said phial (18) being of the breakable type.