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Related Experiment Videos

Sintered platinum for cardiac pacing

G E Freud, B Chinaglia

    The International Journal of Artificial Organs
    |September 1, 1981
    PubMed
    Summary

    New platinum electrodes for cardiac stimulation offer safe, low-energy heart pacing. These electrodes demonstrate excellent performance and tissue acceptance, improving pulse generator longevity and battery utilization.

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    Area of Science:

    • Biomedical Engineering
    • Cardiology
    • Materials Science

    Background:

    • Cardiac pacing requires efficient and safe electrode technology.
    • Existing electrodes face challenges with energy consumption and longevity.
    • Surface porosity and material properties influence electrode performance.

    Purpose of the Study:

    • To develop and evaluate novel platinum electrodes for cardiac stimulation.
    • To assess the in vitro and in vivo performance of these electrodes.
    • To determine the potential for low-energy stimulation and improved device longevity.

    Main Methods:

    • Platinum electrodes with 40 micrometer surface porosity were fabricated using a sintering process.
    • In vitro testing evaluated polarization and sensing impedance.
    • Animal studies assessed tissue acceptance, followed by clinical trials in 31 patients.

    Main Results:

    • Electrodes exhibited excellent in vitro characteristics, including low polarization and sensing impedance.
    • Animal testing confirmed good tissue acceptance.
    • Clinical trials showed a threshold at implant of 0.375 µJ (SD: 0.174 µJ) and a chronic threshold of 1.15 µJ (SD: 1.05 µJ) over a mean observation period of 17.1 weeks.

    Conclusions:

    • The developed platinum electrodes enable safe cardiac stimulation using low-energy pulses.
    • A reliable safety margin was achieved with pulses compatible with existing lithium batteries, eliminating the need for a voltage doubler.
    • This advancement can enhance battery utilization and extend the longevity of pulse generators.

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