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Related Experiment Videos

A new method for measuring cerebrospinal fluid flow in shunts.

M Hara, C Kadowaki, Y Konishi

    Journal of Neurosurgery
    |April 1, 1983
    PubMed
    Summary

    A new implantable device accurately measures cerebrospinal fluid (CSF) flow in shunt tubes using ultrasonic Doppler probes. This technology reveals a potential circadian rhythm in CSF flow rates, crucial for hydrocephalus management.

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    Area of Science:

    • Biomedical Engineering
    • Neurosurgery
    • Medical Devices

    Background:

    • Ventriculoperitoneal shunts are critical for managing hydrocephalus.
    • Accurate measurement of cerebrospinal fluid (CSF) flow is essential for shunt efficacy.
    • Existing methods for monitoring CSF flow in shunts are limited.

    Observation:

    • An implantable device utilizes extracorporeal high-frequency power to create bubbles in the shunt tube.
    • Ultrasonic Doppler probes detect bubble velocity, enabling CSF flow rate calculation.
    • The device incorporates a coil, capacitor, diodes, and platinum electrodes, encapsulated in medical-grade materials.

    Findings:

    • The developed flowmeter successfully measured CSF flow rates from 0.033 to 1.0 ml/min in animal experiments.

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  • Clinical measurements in hydrocephalus patients showed flow rates between 0.05 and 0.78 ml/min.
  • Continuous 24-hour monitoring revealed significant fluctuations in CSF flow, suggesting a circadian rhythm.

    • Implications:

    • This technology offers a novel, non-invasive method for real-time CSF flow monitoring in patients with shunts.
    • Understanding CSF flow dynamics and circadian rhythms can optimize hydrocephalus treatment strategies.
    • The device has potential applications in evaluating shunt function and detecting complications.