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第 1 期             王松, 等: 髓核固定/滑动型人工颈椎间盘应力特征对比及关节面摩擦学优化设计                                      83

            劣势在于髓核运动更复杂,会导致应力数值更大.                             2.3    基于应力的关节面摩擦学优化设计
                固定型假体总变形特征如图6所示,上终板、髓核                             表5给出了按照表2正交试验分组的计算结果,发

            和下终板的最大总变形量分别为68.9、47.0和68.2 mm.                   现关节面不同参数组合下最大应力数值相差较大,
            以髓核组件为例,固定型最大变形量是滑动型的                              No.7的最大应力数值最小(2.79 MPa),No.8的数值最
            22.5%,因此,固定型假体要远小于滑动型的变形量.                         大(10.85 MPa),二者相差近3倍. 利用Minitab软件分析
            但在变形分布方面,二者却极为相似,最大变形量均                            得到的均值响应表见表6,关节面参数对最大应力影
            集中在假体前端和后端,且呈现左右对称、前后对称                            响权重排序是球缺高度>球头半径>球窝间隙,且高度
            特征.                                                和半径越大、间隙越小越好,半径、间隙和高度三者最

                  A: Static structural                               A: Static structural
                  Total deforration 2                                Total deforration 2
                  Type: Total deforration                            Type: Total deforration
                  Unit: mm                                           Unit: mm
                  Time: 1                                            Time: 1
                  2020-3-24 12:07                                    2020-3-24 12:07
                    68.907 Max                                        68.907 Max
                    62.76                                             62.76
                    56.612                                            56.612
                    50.465                                            50.465
                    44.318                                            44.318
                    38.17                                             38.17
                    32.023                                            32.023
                    25.875                                            25.875
                    19.728                                            19.728
                    13.58 Min                                         13.58 Min
                                                                                                    z
                              0       10 mm        x                             0       10 mm   x
                                   5              y                                   5              y
                                  (a1)                                                (a2)
                  A: Static structural                                A: Static structural
                  Total deforration 3                                 Total deforration 3
                  Type: Total deforration                             Type: Total deforration
                  Unit: mm                                            Unit: mm
                  Time: 1                                             Time: 1
                  2020-3-24 12:07                                     2020-3-24 12:06
                   46.992 Max                                          46.992 Max
                   41.809                                              41.809
                   36.627                                              36.627
                   31.444                                              31.444
                   26.262                                              26.262
                   21.079                                              21.079
                   15.897                                              15.897
                   10.714                                              10.714
                   5.5319                                              5.5319
                   0.34943 Min                                         0.34943 Min
                                                                                                   z
                              0       10 mm        x                              0      10 mm
                                                                                                 x
                                  5              y                                    5             y
                                  (b1)                                                (b2)
                  A: Static structural                                A: Static structural
                  Total deformation 4                                 Total deformation 4
                  Type: Total deforrmation                            Type: Total deforrmation
                  Unit: mm                                            Unit: mm
                  Time: 1                                             Time: 1
                  2020-3- 24 12:08                                    2020-3- 24 12:06
                   68.233 Max                                          68.233 Max
                   61.064                                              61.064
                   53.895                                              53.895
                   46.726                                              46.726
                   39.557                                              39.557
                   32.387                                              32.387
                   25.218                                              25.21 8
                   18049                                               18.049
                   10.88                                               10.88
                   3.7 107 Min                                         3.7107 Min
                                                                                                    z
                              0       10 mm                                      0       10 mm
                                                   x                                             x
                                  5             y z                                   5             y
                                  (c1)                                                (c2)

             Fig. 6  The characteristics of the Total Deformation for the artificial cervical disc with fixed nucleus pulposus:(a1) the upper surface
              of the upper endplate,(a2) the lower surface of the upper endplate,(b1) the upper surface of the nucleus pulposus,(b2) the lower
                 surface of the nucleus pulposus,(c1) the upper surface of the lower endplate,(c2) the lower surface of the lower endplate
               图 6    髓核固定型人工颈椎间盘总变形特征:(a1) 上终板上表面,(a2) 上终板下表面,(b1) 髓核上表面,(b2) 髓核下表面,
                                              (c1) 下终板上表面,(c2) 下终板下表面
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