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Related Experiment Videos

Physical testing of elastomers for cardiovascular applications.

C R McMillin

    Artificial Organs
    |February 1, 1983
    PubMed
    Summary

    Developing short-term fatigue tests is crucial for evaluating elastomers in cardiovascular applications. Unexpectedly, blood environments extend elastomer fatigue life compared to air or water.

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    Area of Science:

    • Biomaterials Science
    • Polymer Engineering
    • Cardiovascular Device Development

    Background:

    • Current limitations in short-term in vitro fatigue tests hinder the prediction of long-term in vivo elastomer performance in physiological conditions.
    • This lack of predictive data impedes the commercialization and adoption of novel elastomers for cardiovascular applications.
    • Existing elastomers also face slow integration due to insufficient comparative performance data.

    Purpose of the Study:

    • To develop reliable short-term in vitro fatigue tests for predicting the long-term in vivo performance of elastomers.
    • To address the critical need for comparative data to facilitate the development and application of new cardiovascular elastomers.
    • To investigate the influence of physiological environments on elastomer fatigue life.

    Main Methods:

    • Utilized a constant strain fatigue test machine to conduct a wide variety of fatigue tests.
    • Employed a daily increasing strain regimen until specimen failure.
    • Investigated both cut-initiated and uncut test specimens to assess fatigue behavior.

    Main Results:

    • Blood environments were found to significantly extend the fatigue life of elastomers compared to air or water.
    • Fatigue testing with increasing strain daily provided valuable performance data.
    • Combining results from cut-initiated and uncut specimens offered the most predictive insights.

    Conclusions:

    • Short-term fatigue testing is essential for advancing elastomer development in cardiovascular applications.
    • The physiological environment, specifically blood, demonstrates a beneficial effect on elastomer fatigue resistance.
    • A comprehensive testing approach using diverse specimen types enhances predictive accuracy for elastomer performance.

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