Flexible piezoelectric sensors can detect mechanical deformations in the gastrointestinal tract of ambulating pigs and simultaneously harvest energy from it.
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Haghiashtiani, G., McAlpine, M.C. Sensing gastrointestinal motility. Nat Biomed Eng 1, 775–776 (2017). https://doi.org/10.1038/s41551-017-0146-1
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DOI: https://doi.org/10.1038/s41551-017-0146-1
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