Development of a small wireless position sensor for medical capsule devices

T. Nagaoka, A. Uchiyama

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Medical capsule devices such as video capsule endoscopes are finding increasing use in clinical applications. At present, technologies capable of measuring capsule position in the digestive tract have not yet been established. The present study aims to develop a small wireless position sensor capable of measuring capsule position based on the phenomenon of mutual induction. Currents into primary coils are adjusted to maintain electromotive force induced in secondary coils at a constant level. Electromotive forces induced in the secondary coils are modulated to FM signals using an astable multivibrator, and the signals are passed directly through living tissue at low current and then demodulated by detectors on the surface of the body. A prototype wireless sensor was developed and evaluated in vitro. The sensor was capable of accurately measuring capsule position up to 500 (mm) from the primary coils with an accuracy of 5 (mm). Miniaturization of the sensor is necessary for commercialization.

Original languageEnglish
Pages (from-to)2137-2140
Number of pages4
JournalUnknown Journal
Volume26 III
Publication statusPublished - 2004

Fingerprint

capsules
Capsules
coils
Electromotive force
sensors
Sensors
electromotive forces
Multivibrators
multivibrators
Endoscopy
endoscopes
commercialization
miniaturization
low currents
frequency modulation
Tissue
Detectors
induction
prototypes
detectors

Keywords

  • Biomedical telemetry
  • Digestive system
  • Position measurement

ASJC Scopus subject areas

  • Bioengineering

Cite this

Development of a small wireless position sensor for medical capsule devices. / Nagaoka, T.; Uchiyama, A.

In: Unknown Journal, Vol. 26 III, 2004, p. 2137-2140.

Research output: Contribution to journalArticle

Nagaoka, T & Uchiyama, A 2004, 'Development of a small wireless position sensor for medical capsule devices', Unknown Journal, vol. 26 III, pp. 2137-2140.
Nagaoka, T. ; Uchiyama, A. / Development of a small wireless position sensor for medical capsule devices. In: Unknown Journal. 2004 ; Vol. 26 III. pp. 2137-2140.
@article{081b0e8ee14d42f5a9be4440bc4fec8b,
title = "Development of a small wireless position sensor for medical capsule devices",
abstract = "Medical capsule devices such as video capsule endoscopes are finding increasing use in clinical applications. At present, technologies capable of measuring capsule position in the digestive tract have not yet been established. The present study aims to develop a small wireless position sensor capable of measuring capsule position based on the phenomenon of mutual induction. Currents into primary coils are adjusted to maintain electromotive force induced in secondary coils at a constant level. Electromotive forces induced in the secondary coils are modulated to FM signals using an astable multivibrator, and the signals are passed directly through living tissue at low current and then demodulated by detectors on the surface of the body. A prototype wireless sensor was developed and evaluated in vitro. The sensor was capable of accurately measuring capsule position up to 500 (mm) from the primary coils with an accuracy of 5 (mm). Miniaturization of the sensor is necessary for commercialization.",
keywords = "Biomedical telemetry, Digestive system, Position measurement",
author = "T. Nagaoka and A. Uchiyama",
year = "2004",
language = "English",
volume = "26 III",
pages = "2137--2140",
journal = "Nuclear Physics A",
issn = "0375-9474",
publisher = "Elsevier",

}

TY - JOUR

T1 - Development of a small wireless position sensor for medical capsule devices

AU - Nagaoka, T.

AU - Uchiyama, A.

PY - 2004

Y1 - 2004

N2 - Medical capsule devices such as video capsule endoscopes are finding increasing use in clinical applications. At present, technologies capable of measuring capsule position in the digestive tract have not yet been established. The present study aims to develop a small wireless position sensor capable of measuring capsule position based on the phenomenon of mutual induction. Currents into primary coils are adjusted to maintain electromotive force induced in secondary coils at a constant level. Electromotive forces induced in the secondary coils are modulated to FM signals using an astable multivibrator, and the signals are passed directly through living tissue at low current and then demodulated by detectors on the surface of the body. A prototype wireless sensor was developed and evaluated in vitro. The sensor was capable of accurately measuring capsule position up to 500 (mm) from the primary coils with an accuracy of 5 (mm). Miniaturization of the sensor is necessary for commercialization.

AB - Medical capsule devices such as video capsule endoscopes are finding increasing use in clinical applications. At present, technologies capable of measuring capsule position in the digestive tract have not yet been established. The present study aims to develop a small wireless position sensor capable of measuring capsule position based on the phenomenon of mutual induction. Currents into primary coils are adjusted to maintain electromotive force induced in secondary coils at a constant level. Electromotive forces induced in the secondary coils are modulated to FM signals using an astable multivibrator, and the signals are passed directly through living tissue at low current and then demodulated by detectors on the surface of the body. A prototype wireless sensor was developed and evaluated in vitro. The sensor was capable of accurately measuring capsule position up to 500 (mm) from the primary coils with an accuracy of 5 (mm). Miniaturization of the sensor is necessary for commercialization.

KW - Biomedical telemetry

KW - Digestive system

KW - Position measurement

UR - http://www.scopus.com/inward/record.url?scp=11144289626&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11144289626&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:11144289626

VL - 26 III

SP - 2137

EP - 2140

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

ER -