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    • 7. 发明授权
    • Porous coated bone screw
    • 多孔涂层骨螺钉
    • US5098434A
    • 1992-03-24
    • US619029
    • 1990-11-28
    • Jon Serbousek
    • Jon Serbousek
    • A61B17/86A61F2/30A61L31/14
    • A61B17/866A61B17/8625A61F2/30767A61L31/146A61F2002/3085Y10S606/907
    • A bone screw is disclosed for joining bone fragments or for mounting a prosthetic component onto an underlying bone. The bone screw includes a head and an elongated cylindrical shank which is integral with and extends from the head. The shank includes a threaded member and a shoulder member connecting the threaded member and the head, the shoulder member having an outer surface with a porous medium thereon for encouraging bone ingrowth fixation. The outer diameter of the shoulder member is greater than the diameter of a bore of the bone into which the screw is to be threadedly engaged. The head of the screw is provided with a coupling member engageable by a tool for selectively rotating the shank to advance the screw into the bone. As the bone screw is advanced toward a fully seated position, the shoulder member with the porous medium thereon engages the bone in a fitting manner which may be described as a "scratch fit". Initial loosening of the bone screw due to the viscoelastic relaxation of the bone tissue following fixation is thereby largely inhibited and long term loosening of the bone screw is also inhibited by providing an interface onto which or into which bone tissue can grow to stabilize the repair site or the implanted component.
    • 公开了用于接合骨碎片或用于将假体组件安装到下面的骨上的骨螺钉。 骨螺钉包括头部和与头部成一体并从头部延伸的细长圆筒形柄部。 所述柄包括螺纹构件和连接所述螺纹构件和所述头部的肩部构件,所述肩部构件具有外表面,其上具有用于鼓励骨向内生长固定的多孔介质。 肩部构件的外径大于螺钉与其螺纹接合的骨的孔的直径。 螺钉的头部设置有可由工具接合的联接构件,用于选择性地旋转柄以将螺钉推进到骨中。 当骨螺钉朝向完全就位的位置前进时,其上具有多孔介质的肩部构件以可被描述为“划痕”的配合方式接合骨骼。 因此,固定后由于骨组织的粘弹性松弛引起的骨螺钉的初始松动因此受到很大的抑制,并且通过提供骨组织可以生长到其中或可以生长以稳定修复部位的界面也可以抑制骨螺钉的长期松动 或植入的部件。