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Related Experiment Video

Updated: Feb 24, 2026

Epidural Intracranial Pressure Measurement in Rats Using a Fiber-optic Pressure Transducer
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A Novel Intracranial Pressure Readout Circuit for Passive Wireless LC Sensor.

Fa Wang, Xuan Zhang, Mehdi Shokoueinejad

    IEEE Transactions on Biomedical Circuits and Systems
    |August 16, 2017
    PubMed
    Summary

    We developed a low-cost, wireless system for monitoring intracranial pressure using an implantable passive sensor. This novel system offers accurate, real-time pressure readings for medical applications.

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    Area of Science:

    • Biomedical Engineering
    • Medical Devices
    • Wireless Sensing Technology

    Background:

    • Intracranial pressure (ICP) monitoring is crucial for diagnosing and managing neurological conditions.
    • Existing ICP monitoring methods often involve invasive procedures or costly equipment.
    • There is a need for accessible, wireless, and reliable ICP monitoring solutions.

    Purpose of the Study:

    • To develop and evaluate a low-cost, wireless system for intracranial pressure monitoring.
    • To demonstrate the feasibility of using a passive implantable sensor with an external reader.
    • To achieve accurate and real-time ICP measurements for clinical use.

    Main Methods:

    • Designed an implantable passive sensor with spiral coils to detect pressure-induced resonant frequency shifts.
    • Developed a novel high-frequency circuit topology for an external reader to track impedance and phase changes.
    • Utilized a wide frequency range (35 MHz-2.7 GHz) for wireless data acquisition.
    • Validated the system's performance through prototype development and measurements.

    Main Results:

    • The wireless ICP monitoring system achieved a measurement distance greater than 2 cm.
    • Demonstrated a sufficient sampling frequency exceeding 6 Hz for medical practice.
    • Reported a high responsivity of 0.92 MHz/mmHg and a fine resolution of 0.028 mmHg.
    • COMSOL simulations confirmed the system's safety regarding specific absorption rate.

    Conclusions:

    • The developed low-cost, wireless ICP monitoring system is a promising solution for medical applications.
    • The novel circuit topology and passive sensor design enable reliable and accurate pressure measurements.
    • Further improvements in antenna design, power radiation, ADC, and signal processing can enhance device performance.