An interspinous device for arthrodesis, comprising a main body of distraction, inserted between two adjacent spinous processes to provide a relative support a first and a second pair of lateral stabilizers support means of each of the pairs of stabilizers slidable with respect to the main body and a threaded shaft of actuation of the lateral stabilizers, percutaneously operable to determine a rotation and a subsequent translation of the stabilizers with respect to said main body, wherein the overall arrangement is such that each stabilizer is rotatably movable relative to the main body between a first closed configuration and a second open configuration, in which the stabilizers are open wide, and between the 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.
