Patent ID: 8308775
Filing Date: 2012-11-13
Classification: A61B

Abstract:
1. A method for rotating a vertebra or vertebrae in a spine that is curved, comprising the steps of: using a vertebral osteosynthesis device that includes, implanting a first series of said polyaxial screws in vertebrae of the spine, on the convex side of the spine curvature, the convex side being the medial side on which the vertebral bodies are rotated, and a second series of said polyaxial screws in vertebrae of the spine, on the concave side of the spine curvature, followed by i) inserting a first linking rod in a first series of said clamping parts and the second linking rod in a second series of said clamping parts, ii) orientating said proximal threaded parts of said first series of said polyaxial screws for allowing the engagement of said first series of clamping parts on said proximal threaded parts of said first series of said polyaxial screws, iii) orientating said proximal threaded parts of said second series of said polyaxial screws for allowing the engagement of said second series of clamping parts on said proximal threaded parts of said second series of said polyaxial screws, and iv) engaging said first series of said clamping parts on the proximal thread parts of said first series of said polyaxial screws and engaging said second series of said clamping parts on the proximal threaded parts of said second series of said polyaxial screws; engaging and completely tightening said tightening nuts on said proximal threaded parts of said first series of polyaxial screws, so as to tighten said first clamping parts against said bearing portions of said first series of polyaxial screws and to eliminate polyaxiality of said first series of polyaxial screws; engaging and partly tightening said tightening nuts on said proximal threaded parts of said second series of polyaxial screws, so as to position said second linking rod in a final position in which the second linking rod is substantially level with said first linking rod of said first series of screws substantially in a same transverse plane of the vertebrae; completely tightening the tightening means of said second series of said clamping parts, so as to immobilize said second linking rod with respect to said clamping parts of said second series of clamping parts in said final position; further tightening said tightening nuts on said second series of said polyaxial screws, so as to move said clamping parts of said second series of clamping parts in a direction of said bearing portions of said polyaxial screws of said second series until the respective said clamping parts reach the respective said bearing portions, thus causing a rotation of the vertebrae about a longitudinal axis of said first linking rod, a total reduction of the rotation of the vertebra being achieved when said tightening nuts on said second series of said polyaxial screws are completely tightened; and completely tightening said tightening means of said first series of clamping parts, so as to immobilize said first linking rod with respect to said clamping parts of said first series of clamping parts.