An expansible device of medical use for thorax specific compression including an applicable framework as a belt around a patients thorax. The belt has a front arc and a back arc faced by concave inner sides and connected on both sides of the thorax by a hinge and by an adjustable side closure. The front arc includes a plate that compresses the deformity, and adjustable suspension for keeping both arcs spaced hanged from the shoulders. The belt also includes at least six joined bent plates, each arc being formed by at least three plates the ends of which overlap connecting the plates by a fixer. The compressing plate includes anchorages for associating an equipment for measuring the pressure made in adjusting the closure between the arcs. The invention includes a device, system, and method to treat a thoracic deformity.
