Chinese Journal of Tissue Engineering Research ›› 2020, Vol. 24 ›› Issue (6): 862-868.doi: 10.3969/j.issn.2095-4344.2442
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Wang Xiaohui1, Wang Kun1, Hu Zhiyong1, Tian Hongliang2
Received:
2019-05-31
Revised:
2019-06-04
Accepted:
2019-07-27
Online:
2020-02-28
Published:
2020-01-17
Contact:
Wang Kun, Master, Associate Professor, School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010000, Inner Mongolia Autonomous Region, China
About author:
Wang Xiaohui, Master, School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010000, Inner Mongolia Autonomous Region, China
Supported by:
CLC Number:
Wang Xiaohui, Wang Kun, Hu Zhiyong, Tian Hongliang. Design of the prosthetic socket and the finite element analysis of the interfacial stress[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(6): 862-868.
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由应力分布云图可以看出,接受腔修型后,残肢底端前缘和胫骨脊区域的应力集中现象大幅减缓,髌韧带、腘窝和胫骨内外侧应力分别达到297,226,106及108 kPa。胫骨内外侧受力分布相对于未经修型的接受腔更加均匀合理,但是应力值较高。后侧腘窝处应力值相对于未经修型的接受腔大幅上升,但由于R06型接受腔的腘窝处修型量过大导致此处应力过高。 2.3.3 根据有限元结果反馈指导设计得到R08型接受腔 经修型后的R06模型接受腔,受力分布相对于未经修型接受腔有明显改善,但是部分区域仍需进一步修型。由应力分布结果可知,胫骨脊、腓骨头、腘窝处区域需要压力释放,且释放幅度应较大。胫骨内外侧需进行小幅度的压力释放,据此修型得到R08型接受腔。 2.3.4 患者1穿戴R08型接受腔残肢表面应力有限元分析将进一步修型得到的R08型接受腔与残肢的界面应力进行有限元分析,结果如图10所示。 "
由图10可以看出,残肢表面应力主要分布在髌韧带、胫骨内外侧、腘窝等适合承重的区域,应力峰值分别为183,82,96及175 kPa。其中髌韧带(PT)处的应力最大。胫骨脊和腓骨头处的压力敏感区应力非常小。胫骨内外侧的软组织层较厚,可以承受一定程度的压力。 2.3.5 患者1穿戴R08型接受腔后残肢表面的位移 当患者承受体质量时,截断的骨头被推向接受腔。下面的软组织被压缩,较远处的软组织被向上推向膝盖。残肢穿戴R08型接受腔后表面的位移如图11所示。软组织相对接受腔的滑动在膝关节附近达到峰值5.8 mm。不同残肢的肌肉紧实程度决定滑移量大小,残肢肌肉越紧实滑移量越小,一般5-10 mm属于正常范围。故滑移量峰值5.8 mm符合实际接受腔穿戴情况。 "
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