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    MANUFACTURING A COMPONENT WITH A NEAR SPHERICAL SURFACE
    4.
    发明申请
    MANUFACTURING A COMPONENT WITH A NEAR SPHERICAL SURFACE 审中-公开
    制造具有近旁球面的部件

    公开(公告)号：WO2003061532A1

    公开(公告)日：2003-07-31

    申请号：PCT/GB2003/000157

    申请日：2003-01-16

    Applicant: DEPUY INTERNATIONAL LIMITED ,  FARRAR, Richard

    Inventor： FARRAR, Richard

    IPC: A61F2/32

    CPC classification number: B24B11/00 ,  A61F2/30767 ,  A61F2/3094 ,  A61F2/30942 ,  A61F2/34 ,  A61F2/44 ,  A61F2002/30934 ,  A61F2002/30952 ,  A61F2002/3459 ,  A61F2002/3498 ,  A61F2002/3623 ,  A61F2002/4018 ,  A61F2310/00017 ,  A61F2310/00023 ,  A61F2310/00029 ,  A61F2310/00185 ,  A61F2310/00203 ,  A61F2310/00239 ,  A61F2310/00269 ,  A61F2310/00281 ,  A61F2310/00299 ,  A61F2310/00311 ,  A61F2310/00317 ,  A61F2310/00323 ,  Y10T29/49657 ,  Y10T29/49995 ,  Y10T83/04 ,  Y10T408/03 ,  Y10T409/10795 ,  Y10T409/304424

    Abstract: A method of making a component (2) of an orthopaedic joint prosthesis, which has a bearing surface whose shape corresponds approximately to a part of a sphere and is symmetrical about its polar axis, involves use of a cutting tool (6) which has a circular cutting edge (12) and which can be rotated about an axis (8) which is perpendicular to the plane containing the said cutting edge (12). The method involves (a) rotating the component about its polar axis (4) and rotating the cutting tool (6) about its axis (8), with the cutting edge (12) of the cutting tool (6) in contact with the surface of the component (2); (b) moving the cutting tool (i) in a direction parallel to the polar axis (4) of the component (2) while leaving the angle between the axis of the cutting tool (6) and the polar axis of the component (2) unchanged, and (ii) along its axis (8); and (c) repeating step (a). The movements (i) and (ii) of the cutting tool (6) cause the radius of curvature of the bearing surface to change continuously and monotonically as the angle between the radius and the polar axis of the component changes, so that the shape of the bearing surface deviates from that of a true sphere in such a way that discontinuities in the shape of the bearing surface as a result of individual movements are minimised.

    Abstract translation: 一种制造整形外科关节假体的组件（2）的方法，该方法具有其形状对应于球体的一部分并且关于其极轴对称的支承表面，包括使用切割工具（6），其具有 圆形切割边缘（12），并且其可以围绕垂直于包含所述切割边缘（12）的平面的轴线（8）旋转。 该方法包括（a）围绕其极轴（4）旋转部件并围绕其轴线（8）旋转切割工具（6），切割工具（6）的切割边缘（12）与表面 的组分（2）; （b）在平行于部件（2）的极轴（4）的方向上移动切割工具（i），同时在切割工具（6）的轴线和部件（2）的极轴之间保持角度 ）不变，（ii）沿其轴线（8）; 和（c）重复步骤（a）。 切割工具（6）的运动（i）和（ii）使得轴承表面的曲率半径随着部件的半径和极轴之间的角度的变化而连续且单调地改变，从而形状 轴承表面与真实球体的轴承表面偏离，使得作为单独运动的结果的轴承表面形状的不连续性最小化。

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