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Related Experiment Videos

Technological progress in pacemaker design: hermetic sealing.

J Buffet

    Medical Progress Through Technology
    |December 3, 1975
    PubMed
    Summary
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    Pacemaker longevity is limited by moisture infiltration into mercury batteries, not current drain. Hermetic encapsulation technology shows promise for extending pacemaker battery life for both mercury and lithium types.

    Area of Science:

    • Biomedical Engineering
    • Materials Science

    Background:

    • Clinical data indicates pacemakers, particularly those using mercury batteries, do not consistently achieve an average lifespan of 3 years.
    • Pacemaker battery life appears independent of the consumed current, regardless of pacemaker type (demand or asynchronous).

    Purpose of the Study:

    • To investigate the factors limiting pacemaker battery life.
    • To evaluate a novel hermetic encapsulation technology for pacemakers.

    Main Methods:

    • Analysis of clinical statistics for mercury battery-powered pacemakers.
    • Discharge study of 229 mercury batteries in a dry atmosphere.
    • Application and evaluation of hermetic encapsulation technology in 5835 pacemakers (mercury and lithium).

    Main Results:

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    • 92% of mercury batteries tested in dry conditions remained functional after 54-57 months.
    • Moisture infiltration during epoxy molding is identified as a likely cause of premature pacemaker failure.
    • Hermetic encapsulation technology demonstrated effectiveness over 36 months for both battery types.

    Conclusions:

    • Hermetic encapsulation is a viable strategy to mitigate moisture-induced failure in pacemaker batteries.
    • This technology has the potential to significantly improve the reliability and longevity of cardiac pacemakers.