The screw for the bow root in spinal cord operating or around the bow root for installing the inside adjustment catch for the bow root, central decisive method of the bow root section, and the bow root section

摘要

During vertebral operation is suited for the bow root of the body to make the installation of the screw which easy, around the bow root in order and being decisive method of the bow root section, in the cross section of three dimensional picture of the body, internal and touches to the crust surface of its adjacent bow root the series which obtain each front line step and the series which vis-a-vis each front line it crosses, inside the bow root and through its adjacent body, extends obtains the consecutive each second line which is adjacent with the step which, mutually each second line which mutually largest angleThe step which identifies the bow root section the step which identifies around the bow root with as the territory of the crust surface which becomes and, and as a territory of the crust surface where each second line which opposes mutually becomes mutually parallel and, the decisive method of including. The center of the bow root section is identified from the cross section of the above-mentioned bow root section, as the point which 2 it is led from each center of each second orthogonal line where crosses mutually from each minute point from the above-mentioned crust surface each line crosses.