A post-traumatic immobilization device is produced by a method thereof. The device has an architectural form with a rounded shape, formed by at least two complementary rigid parts (1a, 1b), in the form of a mesh (11). The parts define respective concave cavities and include curved connecting ends (12), and fasteners provided with raised portions (13) for the coupling of elastic O-rings (2) that clamp the rigid parts (1a, 1b) to one another. A method produces the post-traumatic immobilization device.