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Science China Technological Sciences

, Volume 62, Issue 11, pp 1930–1938 | Cite as

Optimization design of extensor for improving locomotion efficiency of inchworm-like capsule robot

  • JinYang GaoEmail author
  • GuoZheng Yan
  • YunBo Shi
  • HuiLiang Cao
  • Kun Huang
  • Jun Liu
Article
  • 74 Downloads

Abstract

An inchworm-like capsule robot (ILCR) is a promising device for a minimally invasive diagnosis and treatment of colon diseases. It consists of two expanders and one extensor, the former provides a traction force by expanding the colon and the latter can elongate and retract to enable active locomotion. However, the locomotion efficiency of the ILCR can be seriously lowered by the complex colon environment featuring slippery, viscoelastic, and suspend properties, which has been a main obstacle to its clinical application. This paper aims at improving the locomotion efficiency of the ILCR by optimizing its extensor design. To do this, the locomotion resistance of the ILCR in the colon is analyzed, and complying with a requirement that the traction force must be larger than the locomotion resistance to avoid slipping, a restriction on the extensor design is obtained. Then under the restriction and with reference to the Hyperelastic model which correlates stress and strain of colon tissue, a model for analyzing the influence of the design parameters of the extensor on the locomotion efficiency of the ILCR is built. With this model, the extensor has been optimized and the optimized results have been used to guide the development of a novel extensor, which employs two pairs of lead-screws and nuts and is actuated by one motor. Ex-vivo experiment has shown that the novel extensor can improve the locomotion efficiency of an ILCR prototype by 57%, without changing its total length.

Keywords

inchworm-like capsule robot extensor design locomotion resistance locomotion efficiency 

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • JinYang Gao
    • 1
    • 2
    Email author
  • GuoZheng Yan
    • 3
  • YunBo Shi
    • 1
  • HuiLiang Cao
    • 1
  • Kun Huang
    • 1
  • Jun Liu
    • 1
  1. 1.Science and Technology on Electronic Test and Measurement LaboratoryNorth University of ChinaTaiyuanChina
  2. 2.Shanxi Key Laboratory of Advanced Manufacturing TechnologyNorth University of ChinaTaiyuanChina
  3. 3.Department of Instrument Science and EngineeringShanghai Jiaotong UniversityShanghaiChina

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