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实用新型
CN202397583U 用于脊柱内固定的万向螺钉 失效 - 权利终止

用于脊柱内固定的万向螺钉
摘要：
本实用新型涉及脊柱内固定装置的技术领域，尤其是一种用于脊柱内固定的万向螺钉，包括螺钉座、球形环和球头螺钉，球形环压入螺钉座内，所述的螺钉座内开有上孔、中间孔和下孔，上孔、中间孔与下孔相通，上孔与下孔的直径相等，中间孔的直径小于上孔、下孔的直径球形环为阶梯轴，球形环上圆周的直径大于下圆周的直径，球形环的边侧开有槽口；中间孔的直径小于球形环上圆周的直径，并大于球形环下圆周的直径，下孔的直径小于球形环上圆周的直径。本实用新型结构简单，装配方便，球形环可对球头螺钉产生预压力，可以使球头螺钉保持在任一方位的固定。
摘要（英）：

The utility model relates to the technical field of a spinal internal fixation device, in particular to a universal screw for spinal internal fixation. The universal screw comprises a screw base, a spherical ring and a ball screw, wherein the spherical ring is pressed in the screw base; an upper hole, a middle hole and a lower hole are formed in the screw base; the upper hole, the middle hole and the lower hole are communicated with one another; the diameter of the upper hole is equal to that of the lower hole; the diameter of the middle hole is less than the diameters of the upper hole and the lower hole; the spherical ring is a stepped shaft; the diameter of the upper circumference of the spherical ring is larger than that of the lower circumference of the spherical ring; a notch is formed on the side of the spherical ring; the diameter of the middle hole is less than that of the upper circumference of the spherical ring and larger than that of the lower circumference of the spherical ring; and the diameter of the lower hole is less than that of the upper circumference of the spherical ring. The universal screw has a simple structure and is convenient to assemble. The spherical ring can generate precompression on the ball screw, so that the ball screw can be fixed in any directions.

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