An interspinous device (1) for arthrodesis, comprising: - a main body of distraction (2, 201), inserted between two adjacent spinous processes to provide a relative support - a first (31, 32) and a second (33, 34) pair of lateral stabilizers in the form of a fin, said pairs being arranged spaced apart along a longitudinal direction (L) of the main body (2), wherein the lateral stabilizers are movable in rotation and translation with respect to the main body, being rotatable about respective axes (A) perpendicular to the longitudinal direction (L) and slidable along the longitudinal direction (L) - support means (41, 42) of each of said pairs of stabilizers, which support means are slidable with respect to said main body (2) along said longitudinal direction (L) - a threaded shaft (5) of actuation of the lateral stabilizers, percutaneously operable to determine a rotation and a subsequent translation of said stabilizers with respect to said main body (2), wherein the overall arrangement is such that each stabilizer (31-34) is rotatably movable relative to said main body (2) between a first closed configuration, in which the stabilizers implement a compact configuration which facilitates the percutaneous insertion of the device, and a second open configuration, in which the stabilizers are open wide, and wherein the overall arrangement is also such that each stabilizer (31-34) is slidably movable between said second open configuration and a third retaining configuration, in which the open-wide stabilizers of the first pair are longitudinally juxtaposed to respective open-wide stabilizers of the second pair so as to abut a spinous process.La présente invention concerne un dispositif interépineux (1) pour arthrodèse comprenant : - un corps principal de distraction (2, 201), inséré entre deux apophyses épineuses adjacentes pour fournir un support associé - une première (31, 32) et une seconde (33, 34) paires de stabilisateurs latéraux sous la forme dune ailette, lesdite
