Page 79 - 《摩擦学学报》2021年第1期

第 41 卷 第 1 期 摩 擦 学 学 报 Vol 41 No 1
2021 年 1 月 Tribology Jan, 2021

DOI: 10.16078/j.tribology.2020059

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

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王 松 , 祝 佳 , 杨梦颖 , 卢俊哲 , 廖振华 , 刘伟强 1,2*
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(1. 深圳清华大学研究院 生物医用材料及植入器械实验室，广东 深圳 518057;
2. 清华大学 机械工程系，北京 100084)
摘 要: 对比了髓核固定型和滑动型人工颈椎间盘应力和变形特征，根据应力和λ值(最小膜厚与等效粗糙度之比)，
采用正交试验法进行关节面摩擦学优化设计. 结果表明：两款球窝假体应力集中均发生在相对运动关节面和组件连
接处，且髓核上表面应力最大值呈环形分布特征. 滑动型相对固定型，优势是运动模式更丰富、应力传递更均匀，劣
势是复杂运动会加大髓核应力(从1.36 MPa到2.43 MPa). 固定型的髓核变形量仅是滑动型的22.5%，但总变形均集
中在前后两端. 关节面参数对应力影响权重是球缺高度>球头半径>球窝间隙，且高度和半径越大、间隙越小越好；
对润滑状态影响权重是球窝间隙>球头半径，且间隙越小、半径越大，润滑状态越佳. 半径、间隙和高度的最佳组合
为16.00 mm、10.0 μm和1.2 mm，在此组合下滑动型假体最大应力数值最小(2.79 MPa)，且润滑状态最佳(λ值0.573).
关键词: 髓核固定型; 髓核滑动型; 人工颈椎间盘; 接触应力; 关节面; 摩擦学优化
中图分类号: TH117.3 文献标志码: A 文章编号: 1004-0595(2021)01–0076–10

Comparison of Stress Characteristics and Tribological
Optimization of Articular Surface Design for Artificial

Cervical Disc with Fixed or Sliding Nucleus Pulposus

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WANG Song , ZHU Jia , YANG Mengying , LU Junzhe , LIAO Zhenhua , LIU Weiqiang 1,2*
(1. Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen,
Guangdong Shenzhen 518057, China
2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Abstract: Two kinds of artificial cervical discs were designed with fixed or sliding nucleus pulposus, based on the
database of physiological parameters of Chinese cervical spine. The stress and deformation characteristics of the two
products were compared by the finite element analysis method. Three key parameters of ball-on-socket structure were
selected including ball radius, radial clearance and hemispherical height. The orthogonal test method was used to
optimize the tribological design on the articular surface, according to the maximum contact stress and the λ value (Ratio
of minimum film thickness to equivalent roughness). The results showed that the stress concentration of the ball-on-
socket prosthesis occurred on the articular surface and the connection location between different components. The
maximum stress on the upper surface of nucleus pulposus presented a circular distribution. Compared with the prosthesis
with fixed nucleus pulposus, the prosthesis with sliding nucleus pulposus showed the advantages of richer movement

Received 7 April 2020, revised 1 June 2020, accepted 9 June 2020, available online 28 January 2021.
*Corresponding author. E-mail: weiqliu@hotmail.com, Tel: +86-755-26551376.
The project was supported by the Natural Science Foundation of China (51705336) and the Innovation Commission of Science and
Technology of Shenzhen Municipality (JCYJ20170816152620649, GJHZ20180413181811215).
国家自然科学基金项目(51705336)，深圳市基础研究课题项目(JCYJ20170816152620649)和深圳市国际合作课题项目
(GJHZ20180413181811215)资助.