SYSTEM AND METHODS FOR IMPROVED ACCESS TO VERTEBRAL BODIES FOR KYPHOPLASTY, VERTEBROPLASTY, VERTEBRAL BODY BIOPSY OR SCREW PLACEMENT

摘要

A method of determining the size and / or placement of screws or other instruments in the pedicles in a region of the spine selected during surgery, the dimensionally realistic three-dimensionality of the bony spine in the region of the spine selected. Generating an image; Hollowing out the spine in a three-dimensional image at a thickness of the cortical wall selected by the surgeon performing the surgery; Determining the narrowest isthmus in each pedicle; Starting in the center of the isthmus and extending in the opposite direction so that it is concentrically placed within the pedicle without touching the walls of the pedicle, terminated within the vertebral torso at a distance from the anterior medial cortex wall, and at the center in the anterior cortex. Generating a straight line extending inward toward the point to penetrate the pedicle cortex of the back; To extend the line concentrically and radially with a smaller cross-sectional area size than the isthmus and allow the line to extend in a cylinder so that any part of the line stops expanding when it contacts the internal cortical wall of the cavified vertebral trunk. Doing; Calculating the diameter, length and / or trajectory of the ideal pedicle screw or instrument based on the dimensions and trajectories generated for each pedicle. Also disclosed are new and improved methods for providing access to the interior of the pedicle for optimal pedicle passing methods, and new pedicle cannula structures and improved pedicle cannula structures.