In Vivo Characterization of a Wireless Telemetry Module for a Capsule Endoscopy System Utilizing a Conformal Antenna

Julia Faerber, Gerard Cummins, Sumanth Kumar Pavuluri, Paul Record, Adrián Ayastuy Rodriguez, Holly S. Lay, Rachael McPhillips, Benjamin F. Cox, Ciaran Connor, Rachael Gregson, Richard Eddie Clutton, Sadeque Khan, Sandy Cochran, Marc Phillipe Yves Desmulliez

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Abstract

This paper describes the design, fabrication, packaging, and performance characterization of a conformal helix antenna created on the outside of a 10 mm ×30 mm capsule endoscope designed to operate at a carrier frequency of 433 MHz within human tissue. Wireless data transfer was established between the integrated capsule system and an external receiver. The telemetry system was tested within a tissue phantom and in vivo porcine models. Two different types of transmission modes were tested. The first mode, replicating normal operating conditions, used data packets at a steady power level of 0 dBm, while the capsule was being withdrawn at a steady rate from the small intestine. The second mode, replicating the worst-case clinical scenario of capsule retention within the small bowel, sent data with stepwise increasing power levels of –10, 0, 6, and 10 dBm, with the capsule fixed in position. The temperature of the tissue surrounding the external antenna was monitored at all times using thermistors embedded within the capsule shell to observe potential safety issues. The recorded data showed, for both modes of operation, a low error transmission of 10−3 packet error rate and 10−5 bit error rate and no temperature increase of the tissue according to IEEE standards.
Original languageEnglish
Pages (from-to)95-105
Number of pages11
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume12
Issue number1
Early online date3 Nov 2017
DOIs
Publication statusPublished - Feb 2018

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    Faerber, J., Cummins, G., Pavuluri, S. K., Record, P., Ayastuy Rodriguez, A., Lay, H. S., McPhillips, R., Cox, B. F., Connor, C., Gregson, R., Clutton, R. E., Khan, S., Cochran, S., & Desmulliez, M. P. Y. (2018). In Vivo Characterization of a Wireless Telemetry Module for a Capsule Endoscopy System Utilizing a Conformal Antenna. IEEE Transactions on Biomedical Circuits and Systems, 12(1), 95-105. https://doi.org/10.1109/TBCAS.2017.2759254