Research on the Critical Sliding Resistance on the Quasi-static Interaction between the Capsule Robot and the Small Intestine
TAN Renjia1,2, LIU Hao1, LI Hongyi1,2, WANG Yuechao1,2
1. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
谭人嘉, 刘浩, 李洪谊, 王越超. 胶囊机器人与肠道准静态交互的临界滑动阻力研究[J]. 机器人, 2014, 36(6): 704-710.DOI: 10.13973/j.cnki.robot.2014.0704.
TAN Renjia, LIU Hao, LI Hongyi, WANG Yuechao. Research on the Critical Sliding Resistance on the Quasi-static Interaction between the Capsule Robot and the Small Intestine. ROBOT, 2014, 36(6): 704-710. DOI: 10.13973/j.cnki.robot.2014.0704.
Currently, there are no effective results about how much resistance the capsule robot (CR) has to overcome during its start. This paper aims to obtain the critical sliding resistance (CSR), and quantify its influencing factors. Based on Ciarletta's superelasticity model, CSR is analyzed for the "internal force-static friction" CR and magnetically driven CR. Firstly, the resistance is modeled, including the pressure on the CR head and the frictions on the CR middle part and CR head, and a CSR expression is obtained from force equilibrium. Secondly, a experimental platform is built and experiments are performed with in-vitro porcine small intestine. Then, influences of three parameters on CSR are investigated, including ratio between CR's outer diameter and the small intestine's natural inner diameter (R/r), the friction coefficient and the length of the CR middle part. The theoretical value and experimental results for CSR match well with each other. Both the increasing of R/r and friction coefficient will increase the CSR. The friction force on the CR head is less than 1% of the total friction force. The CSR has a linear relationship with the length of CR middle part. The proposed model reflects the influences of various factors, and can accurately predict the CSR. The major factor affecting the resistance lies in the R/r.
[1] Glass P, Cheung E, Sitti M. A legged anchoring mechanism for capsule endoscopes using micropatterned adhesives[J]. IEEE Transactions on Biomedical Engineering, 2008, 55(11): 2759-2767.[2] Kim B, Park S, Jee C Y, et al. An earthworm-like locomotive mechanism for capsule endoscopes[C]//IEEE/RSJ International Conference on the Intelligent Robots and Systems. Piscataway, USA: IEEE, 2005: 4092-4097.[3] Kim B, Lee S, Park J H, et al. Design and fabrication of a locomotive mechanism for capsule-type endoscopes using shape memory alloys (SMAs) [J]. IEEE/ASME Transactions on Mechatronics, 2005, 10(1): 77-86. [4] Guo Z, Sluys L J. Computational modelling of the stress-softening phenomenon of rubber-like materials under cyclic loading[J]. European Journal of Mechanics: A/Solids, 2006, 25(5): 877-896.[5] Li H, Furuta K, Chernousko F L. Motion generation of the capsubot using internal force and static friction[C]//45th IEEE Conference on Decision and Control. Piscataway, USA: IEEE, 2006: 6575-6580.[6] Ciuti G, Valdastri P, Menciassi A, et al. Robotic magnetic steering and locomotion of capsule endoscope for diagnostic and surgical endoluminal procedures[J]. Robotica, 2010, 28(2): 199-207. [7] Moglia A, Menciassi A, Schurr M, et al. Wireless capsule endoscopy: From diagnostic devices to multipurpose robotic systems[J]. Biomed Microdevices, 2007, 9(2): 235-243. [8] Ciuti G, Menciassi A, Dario P. Capsule endoscopy: From current achievements to open challenges[J]. IEEE Reviews in Biomedical Engineering, 2011, 4: 59-72.[9] Zhang C, Liu H, Tan R J, et al. Modeling of velocity-dependent frictional resistance of a capsule robot inside an intestine[J]. Tribology Letters, 2012, 47(2): 295-301. [10] Ciarletta P, Dario P, Tendick F, et al. Hyperelastic model of anisotropic fiber reinforcements within intestinal walls for applications in medical robotics[J]. International Journal of Robotics Research, 2009, 28(9): 1279-1288.[11] Bellini C, Glass P, Sitti M, et al. Biaxial mechanical modeling of the small intestine[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2011, 4(7): 1727-1740.[12] Kim J S, Sung I H, Kim Y T, et al. Experimental investigation of frictional and viscoelastic properties of intestine for microendoscope application[J]. Tribology Letters, 2006, 22(2): 143-149. [13] Kim J S, Sung I H, Kim Y T, et al. Analytical model development for the prediction of the frictional resistance of a capsule endoscope inside an intestine[J]. Proceedings of the Institution of Mechanical Engineers, Part H——Journal of Engineering in Medicine, 2007, 221(H8): 837-845.[14] Woo S H, Kim T W, Mohy-Ud-Din Z, et al. Small intestinal model for electrically propelled capsule endoscopy[J]. BioMedical Engineering Online, 2011, 10: 108.[15] Wang Z, Ye X, Zhou M. Frictional resistance model of capsule endoscope in the intestine[J]. Tribology Letters, 2013, 51(2): 409-418.[16] Il'yushin A A. Experimental method of solving an integral equation of the theory of viscoelasticity[J]. Polymer Mechanics, 1969, 5(3): 506-509.[17] Zhang C, Liu H, Li H. Modeling of frictional resistance of a capsule robot moving in the intestine at a constant velocity[J]. Tribology Letters, 2013, 53(1): 71-78.[18] Zhang C, Liu H, Li H. Experimental investigation of intestinal frictional resistance in the starting process of the capsule robot[J]. Tribology International, 2014, 70: 11-17.[19] Wang X N, Meng M Q H. Study of frictional properties of the small intestine for design of active capsule endoscope[C]//Proceedings of the IEEE RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics. Piscataway, USA: IEEE, 2006: 983-988.[20] 林蔚,颜国正. 驻留-伸缩式微型胃肠道机器人的力学建模[J].机器人,2012,34(4):553-558.Lin W, Yan G Z. Mechanical modeling of an anchoring-extending gastrointestinal micro robot[J]. Robot, 2012, 34(4): 553-558.[21] Lyle A B, Luftig J T, Rentschler M E. A tribological investigation of the small bowel lumen surface[J]. Tribology International, 2013, 62: 171-176.