In Situ Characterization of Two Wireless Transmission Schemes for Ingestible Capsules

We report the experimental in situ characterization of 30-40 MHz and 868 MHz wireless transmission schemes for ingestible capsules, in porcine carcasses. This includes a detailed study of the performance of a magnetically coupled near-field very high-frequency (VHF) transmission scheme that requires...

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Bibliographic Details
Published in:IEEE transactions on biomedical engineering 2007-11, Vol.54 (11), p.2020-2027
Main Authors: Wang, Lei, Drysdale, Timothy D., Cumming, David R. S.
Format: Article
Language:English
Subjects:
Animals
Attenuation
Biomedical telemetry
Capsules
Carcasses
Coiling
Couplings
Eating
Electronics - instrumentation
Electronics - methods
Energy consumption
Equipment Design
Equipment Failure Analysis
Finite difference methods
finite-difference time- domain ( FDTD) methods
Frequency
Gastrointestinal tract
Humans
In situ measurement
Power consumption
Receiving
Swine
Telemetry
Telemetry - instrumentation
Telemetry - methods
Temperature measurement
Time domain analysis
UHF radio propagation
VHF
VHF radio propagation
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Summary:We report the experimental in situ characterization of 30-40 MHz and 868 MHz wireless transmission schemes for ingestible capsules, in porcine carcasses. This includes a detailed study of the performance of a magnetically coupled near-field very high-frequency (VHF) transmission scheme that requires only one eighth of the volume and one quarter of the power consumption of existing 868-MHz solutions. Our in situ measurements tested the performance of four different capsules specially constructed for this study (two variants of each transmission scheme), in two scenarios. One mimicked the performance of a body-worn receiving coil, while the other allowed the characterization of the direction-dependent signal attenuation due to losses in the surrounding tissue. We found that the magnetically coupled near-field VHF telemetry scheme presents an attractive option for future, miniturized ingestible capsules for medical applications.
ISSN:0018-9294
1558-2531
DOI:10.1109/TBME.2007.895105