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Intracranial pressure telemetry system. I. Hardware development

W H Ko, A Leung, E Cheng

    Biotelemetry and Patient Monitoring
    |January 1, 1981
    PubMed
    Summary
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    Researchers developed new intracranial pressure (ICP) telemetry systems for monitoring brain pressure. These compact, implantable devices offer accurate, stable measurements, advancing neurosurgical monitoring capabilities.

    Area of Science:

    • Biomedical Engineering
    • Neurosurgery
    • Implantable Sensors

    Background:

    • Intracranial pressure (ICP) monitoring is critical in neurocritical care.
    • Existing ICP monitoring methods have limitations, necessitating advanced solutions.
    • Development of wireless, implantable telemetry systems offers improved patient management.

    Purpose of the Study:

    • To report the development of novel single-channel and two-channel intracranial pressure (ICP) telemetry systems.
    • To evaluate the performance and feasibility of these implantable ICP monitoring devices.
    • To present in vivo evaluation results in animal models.

    Main Methods:

    • Hybrid-integrated circuits housed in Kovar flatpacks were utilized.
    • Polyurethane or Hysol epoxy packaging was employed for the implantable units.

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  • Radio frequency (RF) induction power supplies and 3.5 MHz RF power were tested for the two-channel system.

    • Main Results:

    • The telemetry systems feature a compact size (3 x 2 x 0.8 cm, 9 g).
    • Accurate pressure measurements (-20 to +100 mm Hg) with +/- 1.0 mm Hg accuracy were achieved.
    • Excellent baseline stability of better than +/- 2 mm Hg/month was demonstrated.
    • Successful in vivo evaluation was conducted in 17 dogs and 4 goats.

    Conclusions:

    • The developed ICP telemetry systems are suitable for accurate and stable intracranial pressure monitoring.
    • These wireless, implantable devices represent a significant advancement in neurosurgical monitoring technology.
    • Further detailed evaluation is provided in the full study documentation.