Double dowel spinal fusion implant

An intervertebral implant comprising a unitary body having a shape, said shape having a maximum width, said shape comprising a conjoined pair of truncated cones, said pair comprising a first truncated cone having a first centerline and a first variable radius and a second truncated cone having a second centerline and a second variable radius, said truncated cones being conjoined such that the first centerline and the second centerline are separated so as to be coplanar and are disposed at an angle to one another such that the separation between the first centerline and the second centerline remains less than the sum of the first radius and the second radius at any cross section, whereby the width of the shape at any cross section is less than the sum of the diameter of the first truncated cone and the diameter of the second truncated cone.

An intervertebral implant comprising a unitary body having a shape, said shape having a width, said shape comprising a conjoined pair of cylinders, said pair comprising a first cylinder having a first centerline and a first radius and a second cylinder having a second centerline and a second radius, said cylinders being conjoined such that the first centerline and the second centerline are separated so as to be coplanar and such that the separation between the first centerline and the second centerline is greater than the sum of the first radius and the second radius, said first cylinder and said second cylinder being conjoined by an interstitial planar bridge connecting said dowels, whereby the width of the shape is greater than the sum of the diameter of the first cylinder and the diameter of the second cylinder.

An intervertebral implant comprising a unitary body having a shape, said shape having a width, said shape comprising a conjoined pair of cylinders, said pair comprising a first cylinder having a first centerline and a first radius and a second cylinder having a second centerline and a second radius, said cylinders being conjoined such that the first centerline and the second centerline are separated so as to be coplanar and such that the separation between the first centerline and the second centerline is greater than the sum of the first radius and the second radius, said first cylinder and said second cylinder being conjoined by an interstitial planar bridge connecting said dowels, whereby the width of the shape is greater than the sum of the diameter of the first cylinder and the diameter of the second cylinder at the same cross section.

An intervertebral implant comprising a unitary body having a shape, said shape having a maximum width, said shape comprising a conjoined pair of truncated cones, said pair comprising a first truncated cone having a first centerline and a first variable radius and a second truncated cone having a second centerline and a second variable radius, said truncated cones being conjoined such that the first centerline and the second centerline are separated so as to be coplanar and are disposed at an angle to one another such that the separation between the first centerline and the second centerline remains greater than the sum of the first radius and the second radius at any cross section, said first truncated cone and second truncated cone being conjoined by an interstitial planar bridge connecting said truncated cones, whereby the width of the shape at any cross section is greater than the sum of the diameter of the first truncated cone and the diameter of the second truncated cone at the same cross section.

A vertebral distractor tool for use in separating and maintaining optimal separations of adjacent vertebral bodies, said tool comprising a main body defining a pair of circular cylindrical bores, two tapers disposed in lateral-most separation from each other extending from said main body, and a curved land having a radius of curvature approximately equal to the radius of curvature of the anterior faces of vertebral bodies.

A vertebral distractor tool for use in separating and maintaining optimal separations of adjacent vertebral bodies, said tool comprising an outer body having a main body defining a rectangular bore cavity, two lordotic tapers disposed in lateral-most separation from each other extending from said outer body, and a curved land having a radius of curvature approximately equal to the radius of curvature of the anterior faces of vertebral bodies;

• and an insertable reamer guide defining a pair of circular cylindrical bores that is slidably insertable into said outer body.

A reamer guide tool, said tool having the shape of a rectangular solid, and defining two parallel overlapping cylindrical holes of equal diameter disposed with their axes parallel to four faces of the rectangular solid, the axes of the overlapping cylindrical holes being separated by less than the diameter of either hole, and the axes of the two holes being disposed symmetrically within the areas of the two faces of the rectangular solid to which the axes are perpendicular.

A reamer guide tool, said tool having the shape of a rectangular sold, and defining a cylindrical hole disposed with its axis parallel to four faces of the rectangular solid and perpendicular to the other two faces of the rectangular solid, the axis of the cylindrical hole being disposed off center of that axis of the rectangular sold defined by the line connecting the centroids of the two faces to which the cylindrical hole is perpendicular.