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Related Experiment Videos

Surface alterations in dialysis roller pump inserts: a scanning electron microscopy study.

A R Morley, D Barron, P Thompson

    Journal of Biomedical Engineering
    |July 1, 1986
    PubMed
    Summary
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    Particle spalling from dialysis roller pump inserts increases with pumping time. Scanning electron microscopy revealed significant wear on Silastic inserts, while PVC inserts showed fewer abnormalities, indicating material durability differences.

    Area of Science:

    • Materials Science
    • Biomedical Engineering
    • Tribology

    Background:

    • Dialysis roller pumps utilize elastomer inserts that are subject to wear during operation.
    • Particle generation from these inserts can potentially impact dialysis fluid purity and patient safety.
    • Understanding material degradation is crucial for optimizing pump performance and longevity.

    Purpose of the Study:

    • To investigate particle spalling from silicone and PVC elastomer inserts used in dialysis roller pumps.
    • To evaluate the effect of pumping duration on the extent of surface abnormalities and particle detachment.
    • To compare the wear characteristics of different pump insert materials and pump combinations.

    Main Methods:

    • Scanning electron microscopy (SEM) was employed to examine elastomer inserts after controlled pumping experiments.

    Related Experiment Videos

  • Experimental circuits simulated dialysis conditions, monitoring parameters like occlusion, pressure, revolutions, and temperature.
  • Inserts made of Silastic (silicone) and PVC (polyvinyl chloride), including a polyurethane-coated PVC (Pivipol), were tested with specific pump models (Watson-Marlow MHRE and Bellco BL705N).

    • Main Results:

    • SEM revealed various surface abnormalities including splits, cracks, deformations, holes, and craters on pump inserts.
    • The incidence and severity of these abnormalities increased with prolonged pumping durations (1-10 hours).
    • The Silastic/Watson-Marlow pump combination exhibited the most pronounced wear, while the PVC/Bellco combination showed the least.

    Conclusions:

    • Dialysis roller pump inserts undergo particle spalling, with wear accumulating over time.
    • Material choice and pump design significantly influence the rate of elastomer degradation and particle generation.
    • PVC-based inserts demonstrate superior resistance to wear compared to silicone inserts under the tested conditions.