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Urinary catheter structure and testing methods in relation to tissue toxicity.

M Talja, M Ruutu, L C Andersson

    British Journal of Urology
    |August 1, 1986
    PubMed
    Summary
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    Silicone elastomer coated urinary catheters exhibit the lowest tissue toxicity. Advanced in vitro cell culture tests are more reliable than simple in vivo methods for assessing latex catheter safety.

    Area of Science:

    • Biomaterials Science
    • Toxicology
    • Medical Device Engineering

    Background:

    • Latex urinary catheters are prone to leaching toxic substances.
    • Assessing the biocompatibility of medical devices is crucial for patient safety.
    • Existing in vivo toxicity tests may lack sensitivity.

    Purpose of the Study:

    • To evaluate the tissue toxicity of latex urinary catheters from different manufacturers.
    • To compare the effectiveness of various catheter coating materials (siliconized, silicone elastomer, Teflon).
    • To determine the reliability of in vitro cell culture methods versus in vivo tests for toxicity assessment.

    Main Methods:

    • Analyzed eluates from 56 latex urinary catheters using cell cultures to measure DNA synthesis inhibition.

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  • Categorized catheters based on coating material: siliconized, silicone elastomer coated, and Teflon coated.
  • Utilized scanning electron microscopy (SEM) to assess catheter surface morphology, including cracks.

    • Main Results:

    • Silicone elastomer coated catheters demonstrated the lowest toxicity.
    • Half of the siliconized catheters were found to be toxic, compared to only 4 of 13 silicone elastomer coated ones.
    • Teflon and silicone elastomer coatings effectively protected against toxic leaching; cracks correlated with toxicity, but surface contour did not.
    • In vitro cell culture methods proved more sensitive and reliable than manufacturers' simple in vivo tests.

    Conclusions:

    • Silicone elastomer and Teflon coatings offer superior protection against leachable toxins in latex urinary catheters.
    • In vitro DNA synthesis inhibition assays provide a more reliable assessment of urinary catheter safety than simple in vivo tests.
    • Manufacturers should adopt comprehensive in vitro testing protocols to ensure higher quality and safer urinary catheter products.