Device for mixing medical fluids

A device for mixing medical fluids, said device (100) an inlet (101) for receiving at least a first medical fluid, an injection port (102) for injecting a second medical fluid, an outlet ( 103) to eject a mixing said first flow and said second medical fluids, a first duct (104) extending between said injection port (102) and said inlet (101) and a second duct (105) which extending between said inlet (101) and said outlet (103) closed said injection port (102) by a membrane (106) fluid-tight, which can be penetrated by an injection needle, tightly being when said second medical fluid is injected, characterized in that the device (100) includes at least a first portion (107) made of a first material and a second portion (108) made of a second material, wherein said second material is substantially more elastic than said first material, and said inlet (101) and said injection port (102) are included in said first portion (107) and said outlet (103) is included in said second portion (108), wherein said first (107) and said second (108) portions are joined together by means of a combined friction coupling (109, 110) and snap connection (111, 112) providing a first retention force.