Active bending electric endoscope using shape memory alloy wires

T. Kobayashi; T. Matsunaga; Y. Haga

doi:10.1007/978-3-319-23832-6_11

Active bending electric endoscope using shape memory alloy wires

T. Kobayashi, T. Matsunaga, Y. Haga

MEN - Biomedical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter

4 Citations (Scopus)

Abstract

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 language	English
Title of host publication	Mechanisms and Machine Science
Publisher	Kluwer Academic Publishers
Pages	131-139
Number of pages	9
DOIs	https://doi.org/10.1007/978-3-319-23832-6_11
Publication status	Published - 2016 Jan 1

Publication series

Name	Mechanisms and Machine Science
Volume	38
ISSN (Print)	2211-0984
ISSN (Electronic)	2211-0992

Keywords

Active bending mechanism
CMOS imager
Endoscope
SMA wire

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering

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10.1007/978-3-319-23832-6_11

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abstract = "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.",

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