conical pivot

Aim: To study the diagnosis and treatment of ependymoma in conus medullaris and cauda equins.

目的:探讨圆锥马尾部室管膜瘤的诊断及手术治疗特点。

Objective To explore the clinical features and surgical findings of cauda equina and conus medullaris tumors.

①目的　探讨马尾圆锥肿瘤的临床及手术特点。

A way of calculating the intersecting line of cylinder and cone with the aid of supplementary plane;

借助特定辅助平面求圆柱圆锥相贯线的方法

Diagraming the characteristic points on the intersection lines between a sphere and a cone by means of the method of anxiliary sphere;

用辅助球面法求圆球和圆锥相贯线上特殊点

Solution of obliquely intersection-line of cylinder and circular cone;

圆柱与圆锥偏斜交相贯线求法的研究

The Spreading Picture Drawing of the Cylinder and Circular Cone Intersected in the Axial;

相交圆柱与圆锥表面展开图的计算机绘制

The spherical method and auxiliary plane method are usually apply in making up the intersection line, while cylinder and circular cone intersect each other diagonally.

求作圆柱面与圆锥面轴线斜交时的相贯线 ,通常用的作图方法是球面法或辅助平面法。