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Related Experiment Videos

Electrode-tissues interface: modeling and experimental validation.

M Sawan1, Y Laaziri, F Mounaim

  • 1Polystim Neurotechnologies Laboratory-Ecole Polytechnique de Montréal, Department of Electrical Engineering, Montréal (QC), Canada. mohamad.sawan@polymtl.ca

Biomedical Materials (Bristol, England)
|May 7, 2008
PubMed
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We developed an empirical model and integrated circuit for monitoring the electrode-tissue interface (ETI) in implantable devices. This system accurately measures ETI impedance, enhancing device safety and reliability.

Area of Science:

  • Biomedical Engineering
  • Implantable Devices
  • Bioimpedance Measurement

Background:

  • The electrode-tissue interface (ETI) is critical for the safety and reliability of implantable devices like stimulators and sensors.
  • Accurate modeling and monitoring of the ETI are essential for predicting device performance and longevity.

Purpose of the Study:

  • To propose an empirical model for the ETI.
  • To develop a dedicated integrated circuit for measuring ETI complex impedance.
  • To create a wireless monitoring system for real-time ETI evaluation.

Main Methods:

  • An empirical model was developed for the ETI.
  • A custom integrated circuit was designed and fabricated using a 0.18 µm CMOS process.
  • Complex impedance measurements were performed in acute dog experiments from 1 Hz to 100 kHz.

Related Experiment Videos

  • A wireless monitoring device evaluated phase shift and voltage, transmitting data to an external controller.

    • Main Results:

    • The proposed empirical model showed a closer fit to experimental measurements.
    • The integrated circuit successfully measured ETI complex impedance.
    • The fabricated chip has a low power consumption of 4 mW and a small area of 1 mm².
    • Wireless data transmission of ETI parameters was achieved.

    Conclusions:

    • The developed empirical model and integrated circuit provide a reliable method for monitoring the ETI.
    • The system enhances the safety and reliability of implantable devices.
    • The low-power, compact integrated circuit is suitable for practical implantable applications.