Spinal rods having different flexural rigidities about different axes and methods of use
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United States of America Patent
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Issued Date -
Aug 16, 2007
app pub date -
Jan 27, 2006
filing date -
Jan 27, 2006
priority date (Note) -
Abandoned
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Abstract
A vertebral rod has an elongated body extending along a longitudinal axis. The rod also includes a cavity extending the length of the body. Either the body or the cavity may have an asymmetrical shape about a centroid in a plane perpendicular to the longitudinal axis. Alternatively, both may have the symmetrical shape about the centroid. The body of the rod may be bounded by an exterior surface and the cavity. The body has a first bending axis that is perpendicular to longitudinal axis. The body also has a second bending axis that is perpendicular to the longitudinal axis and to the first bending axis. The body of the rod may be distributed asymmetrically about the first and second bending axes. Also, the rod may have a different bending stiffness about the first and second bending axes.
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