Basic characteristics of implantable flexible pressure sensor for wireless readout using MRI

Tatsuya Nakamura, Yusuke Inoue, Dongmin Kim, Naoji Matsuhisa, Tomoyuki Yokota, Tsuyoshi Sekitani, Takao Someya, Masaki Sekino

Research output: Contribution to journalArticle

Abstract

Measurement of pressure within blood vessels will be valuable for the diagnoses of aneurysm. However, implantation of a conventional pressure sensor equipped with power and signal cables causes difficulties in surgery and risk of infection after implantation.In this study, we developed a wireless, implantable, and flexible pressure sensor. An MRI system reads out the sensor output.The proposed wireless sensor is based on an LC resonance circuit with a spiral coil and a pressure-sensitive capacitor.The pressure-dependence of the circuit affects the fields arising from the spiral coil, changing the nearby sample magnetization, and thus can be observed as an MRI signal variation.We fabricated a prototype sensor using silicone elastomer as dielectric with gold wiring. The maximum change in the capacitance was 8% under external pressure of 20 kPa.A change in thickness of dielectric elastomer caused the capacitance change, resulting in a detectable change in MRI.

Original languageEnglish
Pages (from-to)O-409-O-410
JournalTransactions of Japanese Society for Medical and Biological Engineering
Volume52
DOIs
Publication statusPublished - 2014 Aug 17
Externally publishedYes

Keywords

  • Aneurysm
  • Flexible sensor
  • MRI
  • Pressure sensor

ASJC Scopus subject areas

  • Biomedical Engineering

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