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Two Magnetic Sensor Based Real-Time Tracking of Magnetically Inflated Swallowable Intragastric Balloon

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A Correction to this article was published on 11 February 2021

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Abstract

This paper presents a two magnetic sensor based tracking method for a magnetically inflated intragastric balloon capsule (MIBC) which is used for obesity treatment. After the MIBC is swallowed, it is designed to be inflated inside the stomach by approaching a permanent magnet (PM) externally near the abdomen. However, if the balloon inflation is accidentally triggered while the MIBC is still in the esophagus, the esophagus will be damaged. Therefore, to safely inflate the MIBC, we aim to track the MIBC’s position along the esophagus and confirm the MIBC passes through. Typically, magnetic sensor based tracking systems tend to be bulky and costly since they involve computationally intensive optimization with many magnetic sensors. To solve those problems, we develop an algorithm that estimates the position of the PM inside the MIBC by using the grid search combined with the dynamically confined search range and search threshold modulation. Our tracking method achieved an average 1D position error of 3.48 mm which is comparable to the up to 4 mm average error for the other magnetic sensor based tracking systems that require more sensors and computational power compared to our system.

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Acknowledgments

This research is supported by Nanyang Technological University (Start up Grant M4081419) and the authors would like to thank the members of the Robotics Research Centre at Nanyang Technological University for their support and contribution throughout the entire project.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore

    Muneaki Miyasaka, Anthony Meng Huat Tiong, Phuoc Thien Phan, Yanpei Huang & Soo Jay Phee

  2. Department of General Surgery, National University Hospital, Singapore, Singapore

    Hung Leng Kaan

  3. Department of Medicine, National University of Singapore, Singapore, Singapore

    Khek Yu Ho

Authors
  1. Muneaki Miyasaka
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  2. Anthony Meng Huat Tiong
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  3. Phuoc Thien Phan
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  4. Yanpei Huang
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  5. Hung Leng Kaan
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  6. Khek Yu Ho
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  7. Soo Jay Phee
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Correspondence to Muneaki Miyasaka.

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Associate Editor Dan Elson oversaw the review of this article.

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The original online version of this article was revised to correct equation 6, 7, 8 and 9.

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Miyasaka, M., Tiong, A.M.H., Phan, P.T. et al. Two Magnetic Sensor Based Real-Time Tracking of Magnetically Inflated Swallowable Intragastric Balloon. Ann Biomed Eng 49, 1735–1746 (2021). https://doi.org/10.1007/s10439-020-02716-5

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  • DOI: https://doi.org/10.1007/s10439-020-02716-5

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