Interspinous vertebral distractor for percutaneous implantation

An interspinous intervertebral distractor comprising:

• an elongated body with a first and a second end, said elongated body having a longitudinal axis with the first end on one side of the elongated body and the second end on a longitudinally opposite side of the elongated body with respect to the first end, and a transversal dimension perpendicular to the longitudinal axis, adapted to provide an interspinous support between two adjacent spinous processes;
• four mobile stabilizers having a curved shape and connected to the elongated body, a first pair of mobile stabilizers of the four mobile stabilizers being connected to the first end of the elongated body and as a second pair of mobile stabilizers being connected to the second end of the elongated body, each of the four mobile stabilizers connected at a respective individual pivot point of the elongated body distant from the longitudinal axis, wherein the curved shape of the four mobile stabilizers exhibits a rounded side adjacent to the elongated body, a first lateral side and a second lateral side, the first lateral side being substantially convex and the second lateral side being substantially concave, wherein the first lateral side and the second lateral side converge to a common point, wherein the mobile stabilizers of said first pair of mobile stabilizers have a cam-shaped surface made up by said rounded side adjacent to the elongated body;
• a rod configured to be slidingly moved in a recess along the longitudinal axis of the elongated body;
• and
• a cam-shaped portion located at an end of the rod, the cam-shaped portion having a curved shape and being configured to transform a sliding movement of the rod in the recess into a rotational movement of the mobile stabilizers of said first pair around the respective pivot points from a closed position being substantially aligned to the longitudinal axis of the elongated body to a spread apart position and vice versa, wherein the cam-shaped surface of the mobile stabilizers is a shape corresponding to the curved shape of the cam-shaped portion and engaging with the curved shape of the cam-shaped portion.

An interspinous intervertebral distractor capable of introduction into and extraction from the human body and comprising:

• an elongated body with a first and a second end, said elongated body having a longitudinal axis with the first end on one side of the elongated body and the second end on a longitudinally opposite side of the elongated body with respect to the first end, and a transversal dimension perpendicular to the longitudinal axis;
• four mobile stabilizers having a curved shape and connected to the elongated body, a first pair of mobile stabilizers of the four mobile stabilizers being connected to the first end of the elongated body and a second pair of mobile stabilizers being connected to the second end of the elongated body, each of the four mobile stabilizers connected at a respective individual pivot point of the elongated body distant from the longitudinal axis, wherein the curved shape of the four mobile stabilizers exhibits a rounded side adjacent to the elongated body, a first lateral side and a second lateral side, the first lateral side being substantially convex and the second lateral side being substantially concave, and wherein the first lateral side and the second lateral side converge to a common point;
• and
• a moveable element, coupled with the respective pivot points of the four mobile stabilizers of the elongated body and configured to be moved along the longitudinal axis of the elongated body to cause rotation of one or both pairs of the mobile stabilizers around the respective pivot points of said stabilizers,
• wherein:
• at least one pair of said mobile stabilizers is rotatable about said respective pivot points beyond a spread apart position and each mobile stabilizer of said pair is rotatable for angles larger than 90° with respect to a closed position, in particular, between 120° and 180°, and
• the mobile stabilizers of said first pair of mobile stabilizers and the moveable element are configured so that:
• the first pair of mobile stabilizers have an introduction orientation wherein said first lateral substantially convex side of each mobile stabilizer faces said elongated body, and
• the first pair of mobile stabilizers have an extraction orientation wherein said second lateral substantially concave side of each mobile stabilizer faces said elongated body.