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Expandable intraluminal graft: a preliminary study. Work in progress.

J C Palmaz, R R Sibbitt, S R Reuter

    Radiology
    |July 1, 1985
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    This study introduces a novel expandable endoprosthesis graft to prevent arterial recoil after balloon angioplasty. Early results in dogs show promising patency and endothelialization, suggesting potential for treating vascular stenosis.

    Area of Science:

    • Biomedical Engineering
    • Vascular Surgery
    • Materials Science

    Background:

    • Recurrent stenosis after vascular balloon dilatation remains a clinical challenge.
    • Arterial wall recoil necessitates supportive measures post-angioplasty.

    Purpose of the Study:

    • To develop and evaluate an expandable, intraluminal graft to prevent arterial recoil.
    • To assess the efficacy and biocompatibility of a novel stainless steel wire mesh endoprosthesis.

    Main Methods:

    • A woven stainless steel wire mesh graft (200-450 micron wall thickness, 80% open surface) was developed.
    • Grafts were mounted on angioplasty catheters and implanted in canine arteries (aorta, carotid, mesenteric, iliac, renal).
    • Follow-up included patency assessment and light/electron microscopy for endothelialization.

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    Main Results:

    • Six of eleven implanted grafts showed no stenosis up to 8 weeks.
    • Two grafts experienced moderate stenosis due to neointimal hyperplasia.
    • Thrombosis occurred in three grafts under specific conditions (non-heparinized, restricted outflow).
    • Complete endothelial coverage of the graft's inner surface was observed by 3 weeks.

    Conclusions:

    • The expandable endoprosthesis shows potential in preventing arterial recoil and maintaining patency.
    • Further investigation is needed to optimize for thrombosis prevention, particularly in non-heparinized patients.
    • The graft material demonstrates good biocompatibility with rapid endothelialization.