中国组织工程研究 ›› 2017, Vol. 21 ›› Issue (6): 917-922.doi: 10.3969/j.issn.2095-4344.2017.06.017

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聚乳酸-羟基乙酸导管移植修复坐骨神经损伤后的力学特性分析

李正伟1,吕雪漫2,李新颖3,李亚军4,罗  民5
  

  1. 1吉林大学第二医院骨科,吉林省长春市  130026;吉林大学中日联谊医院,2眼科,  3超声科,5疼痛科,吉林省长春市  130033;4吉林大学数学学院,吉林省长春市  130028
  • 收稿日期:2017-01-09 出版日期:2017-02-28 发布日期:2017-03-16
  • 通讯作者: 李新颖,硕士,副主任医师,吉林大学中日联谊医院超声科,吉林省长春市 130033
  • 作者简介:李正伟,男,1978年生,汉族,吉林省长春市人,2009年吉林大学毕业,博士,主治医师,主要从事骨科临床与生物力学研究。
  • 基金资助:

    吉林省科技发展基金项目(20116492):射频调控颈部神经治疗脑源性供血不足的临床研究

Mechanical properties of sciatic nerve injury after repaired with poly(lactic acid-glycolic acid) scaffold

Li Zheng-wei1, Lv Xue-man2, Li Xin-ying3, Li Ya-jun4, Luo Min5
  

  1. 1Department of Orthopaedics, Second Hospital of Jilin University, Changchun 130026, Jilin Province, China; 2Department of Ophthalmology, 3Department of Ultrasound, 5Departemnt of Pain, China-Japan Union Hospital, Jilin University, Changchun 130033, Jilin Province, China; 4School of Mathematics, Jilin University, Changchun 130028, Jilin Province, China
  • Received:2017-01-09 Online:2017-02-28 Published:2017-03-16
  • Contact: Li Xin-ying, Master, Associate chief physician, Department of Ultrasound, China-Japan Union Hospital, Jilin University, Changchun 130033, Jilin Province, China
  • About author:Li Zheng-wei, M.D., Attending physician, Department of Orthopaedics, Second Hospital of Jilin University, Changchun 130026, Jilin Province, China
  • Supported by:

    the Science and Technology Development Foundation of Jilin Province, No. 20116492

摘要:

文章快速阅读:

 

文题释义:
聚乳酸-羟基乙酸支架
:带有一定孔隙,对摄取营养物质有利、对血管的长入有利,对神经修复过程中代谢产物的排出有利,能为种植的许旺细胞和再生神经提供充足的营养,对促进神经的再生有利;具有良好的成囊和成膜性能,无毒,具有良好的生物相容性,是具有生物降解功能的一种高分子有机化合物,目前已被广泛应用于医用工程材料、制药等领域。
应力松弛:黏弹性材料在总应变不变的条件下,由于试样内部的黏性应变(或粘塑性应变)分量随时间不断增长,使回弹应变分量随时间逐渐降低,从而导致变形恢复力(回弹应力)随时间逐渐降低的现象。测定应力松弛曲线是测定松弛模量的实验基础。高温下的紧固零件,其内部的弹性预紧应力随时间衰减,会造成密封泄漏或松脱事故。松弛过程也会引起超静定结构(见结构力学)中内力随时间重新分布。用振动法消除残余应力就是设法加速松弛过程,以便消除材料微结构变形不协调引起的内应力。使流动的黏弹性流体速度梯度减小或突然降为零,流体中的应力逐渐降低或消失的过程也称为应力松弛。

背景:有关自体神经和聚乳酸-羟基乙酸导管移植修复坐骨神经损伤后的拉伸、应力松弛力学特性测试鲜有报道。
目的:对比分析自体神经和聚乳酸-羟基乙酸导管移植修复坐骨神经损伤后的拉伸、应力松弛力学特性。
方法:取死后24 h内的新鲜人尸体坐骨神经标本60条,加工成长35 mm试样,分为3组,正常对照组不做任何处理,人工导管移植组、自体神经移植组切断坐骨神经标本,形成20 mm缺损,分别以聚乳酸-羟基乙酸人工导管、自体神经吻接修复,3组均进行拉伸和应力松弛测试。
结果与结论:①各组坐骨神经试样应力最初600 s下降较快,600 s后下降缓慢,7 200 s时应力松弛曲线接近水平,各组坐骨神经试样的应力松弛曲线为对数关系变化趋势;②自体神经移植组、人工导管移植组拉伸弹性限度载荷、弹性限度应力、最大载荷、最大应力、弹性限度应变、最大应变小于正常对照组(P < 0.05),人工导管移植组拉伸弹性限度载荷、弹性限度应力、最大载荷、最大应力、弹性限度应变、最大应变大于自体神经移植组(P < 0.05);③结果表明,聚乳酸-羟基乙酸人工导管具有很好的拉伸和应力松弛力学特性,符合坐骨神经损伤移植修复生物材料的拉伸力学特性和应力松弛力学特性要求。

关键词: 生物材料, 材料相容性, 聚乳酸-羟基乙酸, 神经再生, 周围神经损伤, 坐骨神经损伤模型, 自体神经, 移植, 修复, 应力松弛

Abstract:

BACKGROUND: The tensile and stress-relaxation mechanical properties of sciatic nerve injury after repaired with autologous nerve and poly(lactic acid-glycolic acid) (PLGA) scaffold are rarely reported.
OBJECTIVE: To analyze the tensile and stress relaxation characteristics of sciatic nerve injury after the transplantation of autologous nerve and PLGA scaffold.
METHODS: Sixty sciatic nerves were extracted from the fresh cadavers dead within 24 hours, processed into 35 mm samples, and were then randomly divided into three groups. The nerve samples in control group received no intervention; the nerves in artificial and autologous groups were modeled into 20 mm defects, followed by repaired with PLGA scaffold and autologous nerve, respectively. Afterwards, the tension and stress-relaxation tests were performed in each group.
RESULTS AND CONCLUSION: The stress in each group descended fast at the first 600 seconds, then descended slowly and was closed to the horizontal level until 7 200 seconds, and the stress-relaxation curves in each group were in logarithmic decrease. The order of the elastic limit load, elastic limit stress, maximum load, maximum stress, elastic limit strain and maximum strain during tension was as follows: control group > artificial group > autologous group (P < 0.05). Our results indicate that the PLGA scaffold holds good tension and stress-relaxation properties, which meets the mechanical requirements of the biomaterials used for sciatic nerve repair.

Key words: Nerve Regeneration, Sciatic Nerve, Tissue Engineering

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