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Related Experiment Videos

Biostability considerations for implantable polyurethanes.

A J Coury, K B Stokes, P T Cahalan

    Life Support Systems : the Journal of the European Society for Artificial Organs
    |January 1, 1987
    PubMed
    Summary
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    Polyurethanes are valuable implantable elastomers, but can degrade through mineralization, stress-cracking, or oxidation. Understanding these polyurethane degradation mechanisms is key to improving long-term device functionality.

    Area of Science:

    • Biomaterials science
    • Polymer chemistry
    • Medical device engineering

    Background:

    • Polyurethanes are widely used as implantable elastomers due to their toughness, durability, biocompatibility, and biostability.
    • These materials exhibit inherent stability within the physiological environment.
    • However, polyurethanes can undergo physical and chemical alterations during processing, fabrication, use, or through interactions with other device components.

    Purpose of the Study:

    • To review the prominent degradation modes of polyurethanes used in medical implants.
    • To highlight the importance of understanding degradation mechanisms for enhancing long-term device performance.

    Main Methods:

    • Literature review of polyurethane degradation in biological environments.
    • Analysis of known degradation pathways including mineralization, environmental stress-cracking, and oxidation.

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    Main Results:

    • Polyurethanes are susceptible to degradation via mineralization, environmental stress-cracking, and oxidation.
    • The precise mechanisms driving these degradation processes are not fully elucidated.
    • Awareness of degradation causes and effects is crucial for material selection and device design.

    Conclusions:

    • Understanding polyurethane degradation is essential for developing advanced, long-lasting medical devices.
    • Procedures informed by degradation knowledge can ensure the long-term functionality of polyurethane-based implants.
    • Further research into degradation mechanisms will facilitate the creation of next-generation biomedical technologies.