Dual tulip assembly
作者： Kenneth Richard Barra , Karen Avanesov
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摘要: A dual tulip assembly has a bone screw and tulip. The first second Each slotted opening for receiving rod. is defined by pair of sides, one side being common to both tulips. On each opening, the sides have proximal end with threads engaging set secure an annular tapered distal securing screw. base forming closed end. at least partially hemispherical head. following head shapes; or spherical head, any other bulbous single piece structure.
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