Methods for determining pedicle base circumference, pedicle...

A - Human Necessities – 61 – B

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A61B 17/56 (2006.01) A61B 17/58 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2640075

A method of determining the pedicle base circumference and the pedicle isthmus to facilitate screw placement in a pedicle of a vertebral body during spinal surgery, comprising providing a series of first lines tangential to the outer cortical surface of the vertebral body in and near the pedicle on a transverse section from a three-dimensional image of the vertebral body, providing a series of second lines extending through the vertebral body in and near the pedicle thereof in perpendicular relation to the series of first lines, identifying the pedicle base circumference as the areas of the outer cortical surface where adjacent second lines are at the greatest angle with respect to one another, and identifying the pedicle isthmus as the areas of the outer cortical surface where the second lines that are opposed to each other are closest to being parallel to one another. The center of the pedicle isthmus is identified from a cross- section thereof as the intersection of two lines derived from the centers of infinitesimal orthogonal second perpendicular lines from the outer cortical surface.

La présente invention concerne un procédé pour déterminer la circonférence de base du pédicule et de l'isthme du pédicule afin de faciliter le placement d'une vis dans un pédicule d'un corps vertébral en chirurgie vertébrale, comprenant la fourniture d'une série de premières lignes tangentielles à la surface corticale externe du corps vertébral dans et à proximité du pédicule sur une section transversale d'une image tridimensionnelle du corps vertébral, la fourniture d'une série de secondes lignes se prolongeant à travers le corps vertébral dans et à proximité du pédicule de celui-ci disposée de manière perpendiculaire à la série des premières lignes, l'identification de la circonférence de base du pédicule comme étant les zones de la surface corticale externe où les secondes lignes adjacentes forment un plus grand angle entre elles et l'identification de l'isthme du pédicule comme étant les zones de la surface corticale externe où les secondes lignes opposées entre elles sont les plus proches d'être parallèles entre elles. Le centre de l'isthme du pédicule est identifié à partir d'une section transversale de celui-ci comme étant l'intersection de deux lignes dérivées des centres des secondes lignes perpendiculaires infinitésimales orthogonales de la surface corticale externe.

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