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IEICE Transactions on Information and Systems 2007 E90-D(2):586-593; doi:10.1093/ietisy/e90-d.2.586
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Biological Engineering

Fabrication of the Wireless Systems for Controlling Movements of the Electrical Stimulus Capsule in the Small Intestines

YeonKwan MOON1, JyungHyun LEE1, HeeJoon PARK1, JuGab LEE1, JaeJong RYU1, SangHyo WOO1, MinKyu KIM2, ChulHo WON3, TaeWan KIM4, JinHo CHO1,2 and HyunChul CHOI1

1 The authors are with the School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu, 702–701 Korea. E-mail: hcchoi{at}ee.knu.ac.kr, 2 The authors are with the Department of Biomedical Engineering, School of Medicine, Kyungpook National University, Daegu, 700–721 Korea., 3 The author is with Kyungil University, Korea., 4 The author is with the Department of Physiology, College of Veterinary Medicine, Kyungpook National University, Daegu, 702–701 Korea.


  Abstract

Diseases of the gastro-intestinal tract are becoming more prevalent. New techniques and devices, such as the wireless capsule endoscope and the telemetry capsule, that are able to measure the various signals of the digestive organs (temperature, pH, and pressure), have been developed for the observation of the digestive organs. In these capsule devices, there are no methods of moving and grasping them. In order to make a swift diagnosis and to give proper medication, it is necessary to control the moving speed of the capsule. This paper presents a wireless system for the control of movements of an electrical stimulus capsule. This includes an electrical stimulus capsule which can be swallowed and an external transmitting control system. A receiver, a receiving antenna (small multi-loop), a transmitter, and a transmitting antenna (monopole) were designed and fabricated taking into consideration the MPE, power consumption, system size, signal-to-noise ratio and the modulation method. The wireless system, which was designed and implemented for the control of movements of the electrical stimulus capsule, was verified by in-vitro experiments which were performed on the small intestines of a pig. As a result, we found that when the small intestines are contracted by electrical stimuli, the capsule can move to the opposite direction, which means that the capsule can go up or down in the small intestines.

Key Words: wireless capsule endoscope, electrical stimulus capsule, moving speed, wireless system, receiver, transmitter, small multi-loop, in-vitro experiments

Manuscript received February 2, 2006. Manuscript revised August 9, 2006.


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