Interspinous fusion device comprising: - a central body defining a longitudinal direction and configured to be inserted between two adjacent spinous processes (100,110); - a proximal body and a distal body, opposite to each other with respect to said central body configured to translate towards each other along said longitudinal direction; - a pair of proximal jaws (21,22) and a pair of distal jaws (23,24) opposite to each other with respect to said central body, spaced apart from each other along said longitudinal direction, and having a first end connected by hinges (21a,22a,23a,24a) to said proximal body and to said distal body, and a second end configured to abut against said spinous processes (100,110); - an actuation system of said proximal and distal bodies (30,40), configured to be percutaneously actuated to cause said relative translation and to cause a rotation of said jaws (21,22,23,24) about said proximal and distal bodies (30,40), so that said jaws (21,22,23,24) perform a displacement from a arr closed configuration to an open configuration; - connecting rods (61,62,63,64) that connect said central body to said pair of proximal jaws (21,22) and said pair of distal jaws (23,24), said connecting rods (61,62,63,64) having a first hinge point (61a,62a,63a,64a) on said central body and a second hinge point (61b,62b,63b,64b) on a respective jaw (21,22,23,24); characterized in that said second ends (21b,22b,23b,24b), in said closed configuration of said jaws, are arranged at a first distance from said first hinge points (61a,62a,63a,64a) and at a second distance from the respective second hinge points (61b,62b,63b,64b), respectively, wherein said first distance is shorter than said second distance, such that, when said jaws (21,22,23,24) move from said closed configuration to said open configuration, said second ends (21b,22b,23b,24b) move substantially transversally to said longitudinal axis and minimize the entrapment of biological tissues between the second ends (21 b,22b,23b,24b) of the jaws and said spinous processes (100,110). - a central body defining a longitudinal direction and configured to be inserted between two adjacent spinous processes (100,110); - a proximal body and a distal body, opposite to each other with respect to said central body configured to translate towards each other along said longitudinal direction; - a pair of proximal jaws (21,22) and a pair of distal jaws (23,24) opposite to each other with respect to said central body, spaced apart from each other along said longitudinal direction, and having a first end connected by hinges (21a,22a,23a,24a) to said proximal body and to said distal body, and a second end configured to abut against said spinous processes (100,110); - an actuation system of said proximal and distal bodies (30,40), configured to be percutaneously actuated to cause said relative translation and to cause a rotation of said jaws (21,22,23,24) about said proximal and distal bodies (30,40), so that said jaws (21,22,23,24) perform a displacement from a arr closed configuration to an open configuration; - connecting rods (61,62,63,64) that connect said central body to said pair of proximal jaws (21,22) and said pair of distal jaws (23,24), said connecting rods (61,62,63,64) having a first hinge point (61a,62a,63a,64a) on said central body and a second hinge point (61b,62b,63b,64b) on a respective jaw (21,22,23,24); said second ends (21b,22b,23b,24b), in said closed configuration of said jaws, are arranged at a first distance from said first hinge points (61a,62a,63a,64a) and at a second distance from the respective second hinge points (61b,62b,63b,64b), respectively, wherein said first distance is shorter than said second distance, such that, when said jaws (21,22,23,24) move from said closed configuration to said open configuration, said second ends (21b,22b,23b,24b) move substantially transversally to said longitudinal axis and minimize the entrapment of biological tissues between the second ends (21 b,22b,23b,24b) of the jaws and said spinous processes (100,110).