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In Vitro and In Vivo characterization of wireless and passive micro system enabling gastrointestinal pressure monitoring

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Abstract

This paper presents a wireless and passive micro pressure system based on the LC mutual inductance detection mechanism for gastrointestinal (GI) pressure monitoring. The micro pressure system is composed of a sensor capsule (a pressure sensitive micro capacitive sensor in series with an induction coil to form an LC tank) and a detection unit (a detection coil connected with a network analyzer). The pressure variations under measurement lead to changes in the capacitance of the pressure sensor and therefore a shift in the LC tank resonant frequency, quantified by the impedance measurement of the detection coil. The pressure sensor was fabricated using microfabrication processes with key parameters optimized. The in vitro characterization of the micro pressure system recorded a sensitivity of 0.2491 kHz/kPa (−10 kPa to 30 kPa). One-month rabbit stomach pressure monitoring was conducted based on the developed micro pressure system as a confirmation of device long term in vivo stability. Furthermore, rabbit stomach pressure variations before and after food feeding was recorded and compared where three distinctive contraction patterns (random contraction with low amplitude, irregular strong contractions and regular contraction in a cyclic manner) following food feeding were located. Compared to previous reported GI pressure sensors, this LC tank is featured with simple device structure without batteries and electrical components for energy transfer. Both in vitro and in vivo characterization confirm the functionality of the system, which may enable the gastrointestinal motility study in the near future.

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Acknowledgments

We acknowledge financial support from NSFC (National Natural Science Foundation of China) with project No. 61372054, the National Basic Research Program of China (973 Program) with project No. 2014CB744602,National High Technology Research and Development Program of China (the 863 Program) with project No. 2012AA040506, Beijing Nova Program with Project No. 2013kjxxjc10 and FP7 with Grant No. PIRSES-GA-2009-247641.

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Authors and Affiliations

  1. State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, People’s Republic of China

    Qiang Shi, Junbo Wang, Deyong Chen, Jian Chen & Kaikai Bao

  2. Department of Gastroenterology, Peking University People’s Hospital, Beijing, People’s Republic of China

    Jing Li

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  1. Qiang Shi
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  2. Junbo Wang
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  3. Deyong Chen
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  4. Jian Chen
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Correspondence to Junbo Wang or Deyong Chen.

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Shi, Q., Wang, J., Chen, D. et al. In Vitro and In Vivo characterization of wireless and passive micro system enabling gastrointestinal pressure monitoring. Biomed Microdevices 16, 859–868 (2014). https://doi.org/10.1007/s10544-014-9890-0

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