Interspinous distraction device comprising: - an interspinous vertebral distractor defining a longitudinal axis; and - a control for said distractor; - said interspinous vertebral distractor comprising ∘ a base body designed to be placed between two spinous processes and defining, in relation to said longitudinal axis, a first end and a second end; ∘ a locking unit attached to said base body at said first end and designed to expand constraining said distractor at said two spinous processes; ∘ an actuator for controlling the passage of said locking unit between an expanded position wherein said locking unit constrains said interspinous vertebral distractor between said two spinous processes and a contracted position wherein said locking unit does not constrain said interspinous vertebral distractor between said two spinous processes; - said base body comprising an opening for access to said actuator at said second end; said control comprising - a first tool comprising a hollow channel and designed to attach itself rotationally to said base body at said second end by arranging said hollow channel in communication with said opening so as to control a rotation of said interspinous vertebral distractor in relation to said spinous processes; - a second tool designed to control, through said actuator, a change in said locking unit; - said second tool is being designed to be inserted in said hollow channel and rotated in relation to said first tool controlling said locking unit; characterised in that - said interspinous vertebral distractor defines a sagittal plane and a frontal plane; wherein a frontal section of said base body comprises a first sector, a second sector, and a central sector; wherein said first sector is at said first end and has a minimum height, wherein said second sector is at said second end and has a maximum height; wherein said central sector defines at least one slope joining said first sector and said second sector; and wherein said base body has a sagittal section comprising at least one convexity defining at least one depression formed at said at least one slope. - an interspinous vertebral distractor defining a longitudinal axis; and - a control for said distractor; - said interspinous vertebral distractor comprising ∘ a base body designed to be placed between two spinous processes and defining, in relation to said longitudinal axis, a first end and a second end; ∘ a locking unit attached to said base body at said first end and designed to expand constraining said distractor at said two spinous processes; ∘ an actuator for controlling the passage of said locking unit between an expanded position wherein said locking unit constrains said interspinous vertebral distractor between said two spinous processes and a contracted position wherein said locking unit does not constrain said interspinous vertebral distractor between said two spinous processes; ∘ a base body designed to be placed between two spinous processes and defining, in relation to said longitudinal axis, a first end and a second end; ∘ a locking unit attached to said base body at said first end and designed to expand constraining said distractor at said two spinous processes; ∘ an actuator for controlling the passage of said locking unit between an expanded position wherein said locking unit constrains said interspinous vertebral distractor between said two spinous processes and a contracted position wherein said locking unit does not constrain said interspinous vertebral distractor between said two spinous processes; - said base body comprising an opening for access to said actuator at said second end; - a first tool comprising a hollow channel and designed to attach itself rotationally to said base body at said second end by arranging said hollow channel in communication with said opening so as to control a rotation of said interspinous vertebral distractor in relation to said spinous processes; - a second tool designed to control, through said actuator, a change in said locking unit; - said second tool is being designed to be inserted in said hollow channel and rotated in relation to said first tool controlling said locking unit; characterised in that - said interspinous vertebral distractor defines a sagittal plane and a frontal plane; wherein a frontal section of said base body comprises a first sector, a second sector, and a central sector; wherein said first sector is at said first end and has a minimum height, wherein said second sector is at said second end and has a maximum height; wherein said central sector defines at least one slope joining said first sector and said second sector; and wherein said base body has a sagittal section comprising at least one convexity defining at least one depression formed at said at least one slope.