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    • 6. 发明公开
    • POROUS TANTALUM METAL HOLLOW SCREW AND APPLICATIONS THEREOF
    • 多孔钽金属空心螺钉及其应用
    • EP3222234A1
    • 2017-09-27
    • EP16858774.9
    • 2016-07-26
    • Zhao, DeweiWang, BenjieXie, HuiHuang, ShiboYu, XiaoweiWang, Wei
    • Zhao, DeweiWang, BenjieXie, HuiHuang, ShiboYu, XiaoweiWang, Wei
    • A61B17/86A61L31/08
    • A porous tantalum metal hollow screw comprises a screw shaft and a screw head. The screw shaft and the screw head are integrally formed. A thread is disposed on the outer surface of the front end of the screw shaft, and the ratio of the length of the thread to the length of the screw shaft is 1:1.7-2.3. The screw head is a conical screw head having a cylindrical screw top, and the included angle between the conical surface of the conical screw head and the central line of the screw shaft ranges from 44° to 46°. Grooves symmetric about the central line of the screw shaft are formed in the outer surfaces of the two sides of the cylindrical screw top; the included angle between the two inclined surfaces of each groove is 60°. A through hole is formed in the central shaft of the screw shaft. A smooth sliding shaft is disposed between the thread and the screw head. By means of the structure of the hollow screw, screwing-in and firm fixation of the hollow screw are facilitated, secondary displacement at a bone fracture part is avoided, the defect of deformation of the tail part of the screw when the screw is screwed in is overcome, and force can reach the front end uniformly, thereby reducing the possibility of deformation and cracking of the screw.
    • 多孔钽金属空心螺钉包括螺钉轴和螺钉头。 螺杆和螺杆头一体成型。 螺杆前端外表面设有螺纹,螺纹长度与螺杆长度的比例为1:1.7-2.3。 螺钉头为圆柱形螺钉头,锥形螺钉头的圆锥面与螺钉轴中心线夹角为44°〜46°。 在圆柱形螺杆顶部两侧的外表面上形成有关于螺杆轴中心线对称的槽; 每个凹槽的两个倾斜表面之间的夹角为60°。 螺杆的中心轴上形成有一个通孔。 在螺纹和螺钉头之间设置有光滑的滑动轴。 借助于空心螺钉的结构,便于中空螺钉的拧入和牢固固定,避免了骨折部分的二次位移,螺钉旋入时螺钉尾部变形的缺陷 被克服,并且力可以均匀地到达前端,从而降低了螺钉变形和开裂的可能性。