Artificial spinal disk prothesis
Intervertebral endoprosthesis discs suitable for surgical implantation between two vertebrae having and methods thereof. The prosthetic disc may have an endoprosthesis body including an anterior region and a posterior region designed to be positioned between a first vertebra and a second vertebra with a first and second movable insert positioned rotatably in anterior cavities and is rotatable to adjust the fasteners.
1. A vertebral implant comprising:
a first attachment fixture having a first anterior region and a first posterior region having a posterior surface and an anterior surface, the first anterior region being raised and extending anteriorly from the anterior surface of the first posterior region;
a first insert having a first fastener aperture and disposed within a first anterior cavity of the first anterior region, wherein the first insert is rotatable in the first anterior cavity;
a second insert having a second fastener aperture and disposed within a second anterior cavity of the first anterior region, wherein the second insert is rotatable in the second anterior cavity;
a second attachment fixture having a second anterior region and a second posterior region;
a third insert having a third fastener aperture and disposed within a third anterior cavity of the second anterior region, wherein the third insert is rotatable in the third anterior cavity;
a fourth insert having a fourth fastener aperture and disposed within a fourth anterior cavity of the second anterior region, wherein the fourth insert is rotatable in the fourth anterior cavity;
a third attachment fixture having a third anterior region and a third posterior region;
a fifth insert having a fifth fastener aperture and disposed within a fifth anterior cavity of the third anterior region, wherein the fifth insert is rotatable in the fifth anterior cavity;
a sixth insert having a sixth fastener aperture and disposed within a sixth anterior cavity of the third anterior region, wherein the sixth insert is rotatable in the sixth anterior cavity;
a first connecting member coupling the first attachment fixture to the second attachment fixture; and
a second connecting member coupling the second attachment fixture to the third attachment fixture.
2. The vertebral implant of claim 1 , wherein the first insert is rotatable independent of the second insert, wherein the third insert is rotatable independent of the fourth insert, and wherein the fifth insert is rotatable independent of the sixth insert.
3. The vertebral implant of claim 1 , wherein the first insert comprises a first tapered region tapering toward the first anterior cavity, the second insert comprises a second tapered region tapering toward the second anterior cavity, the third insert comprises a third tapered region tapering toward the third anterior cavity, the fourth insert comprises a fourth tapered region tapering toward the fourth anterior cavity, the fifth insert comprises a fifth tapered region tapering toward the fifth anterior cavity, and the sixth insert comprises a sixth tapered region tapering toward the sixth anterior cavity.
4. The vertebral implant of claim 1 , wherein the first, second, third, fourth, fifth, and sixth inserts are cylindrical inserts.
5. The vertebral implant of claim 1 , wherein each attachment fixture includes a vertebral contacting surface configured to be attached to a vertebral surface.
6. The vertebral implant of claim 1 , wherein the first, second, and third posterior regions are generally flat.
7. The vertebral implant of claim 1 , wherein the first anterior cavity is defined by a first bridge and a first middle bridge and the second anterior cavity is defined by the first middle bridge and a second bridge, wherein the third anterior cavity is defined by a third bridge and a second middle bridge and the fourth anterior cavity is defined by the second middle bridge and a fourth bridge, and wherein the fifth anterior cavity is defined by a fifth bridge and a third middle bridge and the sixth anterior cavity is defined by the third middle bridge and a sixth bridge.
8. The vertebral implant of claim 7 , wherein each of the first, second, third, fourth, fifth, and sixth inserts is secured in its respective anterior cavity by a respective pair of securing pegs extending into corresponding respective pairs of securing apertures formed in the pair of bridges that define the respective anterior cavity.
9. The vertebral implant of claim 1 , further comprising a first fastener including:
a head sized and shaped to contact the first fastener aperture of the first insert;
a first set of fine proximal threads adapted to mate with complimentary threads of the first attachment fixture; and
a second set of course distal threads adapted to penetrate a bone.