Magnetic control system targeted for capsule endoscopic operations in the stomach - Design, fabrication, and in vitro and ex vivo evaluations

Gi Shih Lien, Chih Wen Liu, Joe Air Jiang, Cheng Long Chuang, Ming Tsung Teng

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


This paper presents a novel solution of a hand-held external controller to a miniaturized capsule endoscope in the gastrointestinal (GI) tract. Traditional capsule endoscopes move passively by peristaltic wave generated in the GI tract and the gravity, which makes it impossible for endoscopists to manipulate the capsule endoscope to the diagnostic disease areas. In this study, the main objective is to present an endoscopic capsule and a magnetic field navigator (MFN) that allows endoscopists to remotely control the locomotion and viewing angle of an endoscopic capsule. The attractive merits of this study are that the maneuvering of the endoscopic capsule can be achieved by the external MFN with effectiveness, low cost, and operation safety, both from a theoretical and an experimental point of view. In order to study the magnetic interactions between the endoscopic capsule and the external MFN, a magnetic-analysis model is established for computer-based finite-element simulations. In addition, experiments are conducted to show the control effectiveness of the MFN to the endoscopic capsule. Finally, several prototype endoscopic capsules and a prototype MFN are fabricated, and their actual capabilities are experimentally assessed via in vitro and ex vivo tests using a stomach model and a resected porcine stomach, respectively. Both in vitro and ex vivo test results demonstrate great potential and practicability of achieving high-precision rotation and controllable movement of the capsule using the developed MFN.

Original languageEnglish
Article number2198061
Pages (from-to)2068-2079
Number of pages12
JournalIEEE Transactions on Biomedical Engineering
Issue number7
Publication statusPublished - 2012


  • Capsule endoscope (CN)
  • ex vivo
  • gastrointestinal (GI) endoscopy
  • in vitro
  • locomotion
  • magnetic field

ASJC Scopus subject areas

  • Biomedical Engineering


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