肠道内表面形貌对其摩擦性能影响的研究

王泽; 周明; 苏冬梅; 李秀莲; 窦琳; 叶霞; 蒋琴仙

肠道内表面形貌对其摩擦性能影响的研究

王泽^1, ,,
周明²,
苏冬梅¹,
李秀莲¹,
窦琳¹,
叶霞¹,
蒋琴仙¹

1.
江苏理工学院材料工程学院, 江苏常州 213001
2.
清华大学国家重点摩擦实验室, 北京 100084

基金项目:

中国国家基础研究项目973项目（2011CB013004）、国家自然科学基金（11102075）、江苏省自然科学基金（BK2012585）、江苏省高校自然科学研究（13KJD430002）、江苏理工学院基础及应用基础基金项目（KYY12019）和博士启动基金（KYY12010）资助.

详细信息

中图分类号: TH117.2
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出版历程
- 收稿日期: 2013-01-20
- 修回日期: 2013-04-21
- 发布日期: 2014-04-04

Experimental Study Concerning the Effects of Profile Morphology of Intestine on the Frictional Characteristics

1.
School of Material Engineering, Jiangsu University of Technology, Changzhou 213001, China
2.
The State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

摘要

摘要: 为了调查肠道内表面形貌对其摩擦性能的影响，本文以家兔小肠为研究对象，表征了其内表面形貌，测试了肠黏液的润滑性；在排除肠道正压力条件下，测试环向应变、载荷、滑动速度与摩擦系数的变化关系.实验结果表明：小肠内表面存在着皱襞、绒毛、微绒毛；肠黏液可将摩擦系数降低到10^-2数量级；环向应变10%是摩擦系数变化的临界值，小于10%摩擦系数不受载荷和滑动速度的影响，大于10%摩擦系数随载荷和滑动速度增大而增大.通过分析环向应变、内表面形貌、肠黏液、载荷、滑动速度与摩擦系数之间的关系，得出摩擦系数变化的机理：当环向应变小于10%，润滑形式为液体润滑；当径向应变大于10%，皱襞被拉伸褶皱消失，润滑形式转化为混合润滑.小肠摩擦性能的研究对胶囊内窥镜、肠道机器人外观设计提供了实验数据，对推进微创、无创诊疗有着重大意义.
- 小肠 /
- 摩擦性能 /
- 环向应变 /
- 皱襞 /
- 边界润滑
Abstract: This work is supposed to determine how intestine morphology influence the intestine friction. Rabbit duodenum was acted as the research object. We characterized inner structure of small intestine, tested the mucus lubricity and measured the change relationships between radial strain, load, sliding velocity and friction coefficient in condition of removing the normal pressure. The results show that inner surface of small intestine mainly included plicas, villi and microvilli. The mucus can reduce the friction coefficient to 10^-2 magnitude. Hoop strain 10% was the critical point of friction coefficient shifting. That is to say, when hoop strain was less than 10%, load and sliding velocity had no influence on the friction coefficient, but while hoop strain was more than 10%, the friction coefficient increased as load and sliding velocity increased. At last, we analyzed the relationships between the friction coefficient and radial strain, inner morphology, mucus, load and sliding velocity, thus friction mechanism was concluded. When the hoop strain was less than 10%, plicas were bended to form wrinkles which were capable to store mucus, the lubrication regime was 1iquid lubrication. When the hoop strain was more than 10%，the plicas were stretched and the wrinkles disappeared，the lubrication regime then was mixed lubrication. The study of its friction characteristics provides experimental data for the appearance design of capsule endoscopy and intestinal robot；besides，it is significant to promote minimally invasive and noninvasive surgery.
- small intestine /
- friction characteristic /
- hoop strain /
- plicas /
- boundary lubrication

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参考文献(8)

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