Active bending electric endoscope using shape memory alloy wires

T. Kobayashi, Tadao Matsunaga, Y. Haga

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Citations (Scopus)


The bending mechanism of a conventional endoscope operates by drawing wires from outside the human body. The shaft structure of endoscopes is relatively complex to avoid buckling by the tensile force of the wire. Therefore, it is difficult to make a conventional endoscope. In this study, an active bending electric endoscope was developed using SMA (shape memory alloy) wires. The SMA wires are driven by Joule heat generated by electric current. As a result, the shaft structure of the active bending mechanism is simplified compared to the conventional endoscope. The active bending mechanism using SMA wires simplifies inspection inside the human body. This device consists of a commercial CMOS imager, three LEDs and a shaft structure. It is capable of multidirectional bending with a curvature radius of approximately 40 mm at 300 mA. The active bending mechanism using SMA wires would be suitable for construction of a disposable endoscope.

Original languageEnglish
Title of host publicationMechanisms and Machine Science
PublisherKluwer Academic Publishers
Number of pages9
Publication statusPublished - 2016 Jan 1

Publication series

NameMechanisms and Machine Science
ISSN (Print)2211-0984
ISSN (Electronic)2211-0992


  • Active bending mechanism
  • CMOS imager
  • Endoscope
  • SMA wire

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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