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

YeonKwan MOON  JyungHyun LEE  HeeJoon PARK  JuGab LEE  JaeJong RYU  SangHyo WOO  MinKyu KIM  ChulHo WON  TaeWan KIM  JinHo CHO  HyunChul CHOI  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E90-D   No.2   pp.586-593
Publication Date: 2007/02/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e90-d.2.586
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Biological Engineering
Keyword: 
wireless capsule endoscope,  electrical stimulus capsule,  moving speed,  wireless system,  receiver,  transmitter,  small multi-loop,  in-vitro experiments,  

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Summary: 
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.