System and methods for improved access to vertebral bodies...

Details System and methods for improved access to vertebral bodies... System and methods for improved access to vertebral bodies...

2006-03-07

2009-11-24

Casler, Brian (Department: 3737)

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

C600S427000, C600S587000, C600S417000, C600S429000, C606S130000

Reexamination Certificate

active

07623902

ABSTRACT:
A method of determining the size and placement of screws in pedicles in a selected spinal area comprising, hollowing out the vertebra in a three-dimensional image of the spine with cortical wall thicknesses selected by a surgeon; determining the isthmus within each pedicle; generating a straight line starting at the center of the isthmus and extending inwardly to a point centered within the anterior cortex so that it is positioned concentrically within the pedicle without touching the walls thereof, the line terminating a predetermined distance from the anterior inner cortical wall and extending outwardly in the opposite direction to penetrate the posterior pedicle cortex; expanding the line concentrically and radially to a cross sectional size that is less than that of the isthmus, the line being expanded into a cylinder that stops growing when any portion thereof contacts the inner cortical wall of the hollowed out vertebral body.

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