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发明申请
US20070191841A1 Spinal rods having different flexural rigidities about different axes and methods of use 审中-公开
具有不同轴的不同弯曲刚性的脊柱和使用方法

Spinal rods having different flexural rigidities about different axes and methods of use
摘要：
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.
摘要（中）：

椎骨杆具有沿着纵向轴线延伸的细长体。 杆还包括延伸身体长度的腔体。 身体或腔体可以在垂直于纵向轴线的平面中具有关于质心的不对称形状。 或者，两者可以具有关于质心的对称形状。 杆的主体可以由外表面和空腔界定。 主体具有垂直于纵向轴线的第一弯曲轴线。 主体还具有垂直于纵向轴线和第一弯曲轴线的第二弯曲轴线。 杆的主体可以围绕第一和第二弯曲轴线不对称地分布。 此外，杆可以具有围绕第一和第二弯曲轴线的不同的弯曲刚度。

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