共查询到18条相似文献,搜索用时 109 毫秒
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医用微型机器人蠕动肠道中的驱动力计算及实验研究 总被引:6,自引:2,他引:6
提出了一种新型的可进入人体内腔和微型机器人驱动机构。此种微型机器人能够在充满液体的弯曲的人体肠道内运行。当机器人在充满液体的微型管道内运行时,在其周围会自动形成一层液体动压润滑膜,此润滑膜能避免机器人与管道壁发生直接接触。结合人体肠道的蠕动方程和N-S方程利用有限元分析计算了此种微型机器人在蠕动肠道中的驱动力和运行速度,进行了机器人的运行实验,结果表明,机器人能以较快速度在肠道内悬浮运行。 相似文献
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针对人体内腔粘液为非牛顿流体的特点,推导了非牛顿流体的变形雷诺方程,建立了螺旋内窥镜机器人在人体内腔中运动的数学模型.采用有限差分法分析了内窥镜机器人各特性参数对机器人形成的最小粘液膜厚度和轴向牵引力的影响,从而获得当需要较厚的粘液膜厚度和较大的轴向驱动力时最优的机器人特性参数,进一步为机器人更好地以较厚的粘液膜厚度和较快的速度悬浮式运行创造条件.内窥镜机器人的运行速度实验证明了此理论分析模型的正确性. 相似文献
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新型内窥镜机器人结构优化设计研究 总被引:1,自引:0,他引:1
研究了一种结构简单的新型内窥镜机器人驱动机构,并建立了内窥镜机器人在人体内腔中运动的数学模型.采用有限差分法分析了内窥镜机器人结构特性参数对机器人的最小粘液膜厚度和轴向摩擦牵引力的影响,从而获得当需要较厚的粘液膜厚度和较大的轴向摩擦驱动力时最优的机器人结构特性参数,为机器人更好地以较厚的粘液膜厚度和较快的速度悬浮式运行创造条件.内窥镜机器人的运行速度试验证明了此理论分析模型的正确性. 相似文献
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提出了一种新型的医用微型机器人的驱动机构,设计建造了模拟实验台,它利用螺旋旋转时产生的轴向牵引力推进机器人在人体内腔中运行,现时利用螺旋旋转时产生的动压效应建立起动压润滑粘液膜,使机器人在体内运行时不与内腔壁发生直接接触,避免对人体有机组织的损伤,实验研究结果表明:此种医用微型机器人在管内运行时可以形成足够厚的粘液膜把机器人与管壁隔开,实现以较快速度的悬浮运行。 相似文献
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医用内窥镜系统体内驱动方式的研究 总被引:3,自引:1,他引:3
提出了一种新型的医用内窥镜系统的体内驱动方式和相应的驱动机构。此方式利用螺旋旋转时产生的牵引力推动医用内窥镜系统在人体内腔中运行,同时利用螺旋旋转时产生的动压效应建立起动压润滑粘液膜,使医用内窥镜系统在体内运行时不与内腔壁发生直接接触。避免对人体有机组织产生损伤。详细分析计算了用此方法驱动的医用内窥镜系统在不同半径、不同粘度粘液和不同弹性模量的内腔中的轴向运行速度和形成的粘液膜厚度,结果表明,用此方法驱动的医用内窥镜系统在人体内腔中运行时可以形成足够厚的粘液膜把医用内窥镜系统与内腔壁隔开,实现以较快速度的悬浮运行。上述分析结果已被实验研究所证实。 相似文献
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医用微型机器人螺纹参数的研究 总被引:1,自引:0,他引:1
研究了一种利用螺旋旋转时产生牵引力的医用微型机器人的驱动机构。详细分析计算了医用微型机器人在采用不同形状螺纹下螺旋时所产生的轴向摩擦牵引力和动压粘液膜承载量。通过对比不同形状螺纹下医用微型机器人运动特性参数的优劣,得出了医用微型机器人最为合适的螺纹参数。 相似文献
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A model is first built for predicting the velocity-dependent frictional resistance of a capsule robot that moves inside the intestine in the paper. The capsule robot plays a more and more important role in checking diseases in the intestine. This study aims to optimize the locomotion mechanism and the control strategy of the capsule robot. The model consists of three parts: environmental resistance, viscous friction, and Coulomb friction. Environmental resistance is induced by the stress due to the viscoelastic deformation of the intestinal wall. Viscous friction is analyzed according to the apparent viscosity of intestinal mucus. Coulomb friction is a product of the local contact pressure and the Coulomb friction coefficient. In order to analyze the effects of the intestinal deformation, a five-element model is used to describe the stress relaxation of the intestinal material. Experimental investigation is used to identify the model parameters with homemade physical simulation measurement system and fixtures. Finally, the model??s validity is verified by experimental results. It is shown that the model predicting results can fit the experimental results well when the moving velocity of the capsule is lower than 20?mm/s. The R 2 of these two sets of data is 0.8769. But at a higher velocity, there are significant differences between the two results and the R 2 declines to 0.1666. The friction model is expected to be useful in the development of the medical equipment in the intestine and the study of biomechanics of the intestine. 相似文献
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Kim JS Sung IH Kim YT Kim DE Jang YH 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2007,221(8):837-845
For the purpose of optimizing the design of the locomotion mechanism as well as the body shape of a self-propelled capsule endoscope, an analytical model for the prediction of frictional resistance of the capsule moving inside the small intestine was first developed. The model was developed by considering the contact geometry and viscoelasticity of the intestine, based on the experimental investigations on the material properties of the intestine and the friction of the capsule inside the small intestine. In order to verify the model and to investigate the distributions of various stress components applied to the capsule, finite element (FE) analyses were carried out. The comparison of the frictional resistance between the predicted and the experimental values suggested that the proposed model could predict the frictional force of the capsule with reasonable accuracy. Also, the FE analysis results of various stress components revealed the stress relaxation of the intestine and explained that such stress relaxation characteristics of the intestine resulted in lower frictional force as the speed of the capsule decreased. These results suggested that the frontal shape of the capsule was critical to the design of the capsule with desired frictional performance. It was shown that the proposed model can provide quantitative estimation of the frictional resistance of the capsule under various moving conditions inside the intestine. The model is expected to be useful in the design optimization of the capsule locomotion inside the intestine. 相似文献