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Related Experiment Videos

Evaluation of epidural needles.

B Kumar, F M Messahel

    Acta Anaesthesiologica Scandinavica
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluated eight epidural needles, finding variations in metal composition and needle-stilette fit. The 18-gauge Crawford needle offered the smoothest inner surface and best clearance.

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    Area of Science:

    • Anesthesiology
    • Materials Science
    • Medical Device Engineering

    Background:

    • Epidural needles are critical for administering anesthesia and analgesia.
    • Variations in needle design and material composition may impact performance and patient safety.
    • Understanding these differences is essential for selecting optimal epidural needles.

    Purpose of the Study:

    • To compare the physical characteristics of eight different epidural needles.
    • To analyze the metal composition and surface properties of various epidural needle types.
    • To assess the fit and clearance between the needle and its stilette.

    Main Methods:

    • Utilized scanning electron microscopy (SEM) for surface analysis.
    • Employed spectral X-ray analysis to determine metal composition.

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  • Evaluated needle-stilette fit and clearance at the bevel and inner surface.

    • Main Results:

    • Identified differences in metal composition, particularly molybdenum content, between disposable and reusable needles.
    • The 18-gauge Crawford needle exhibited the smoothest inner surface and optimal needle-stilette clearance.
    • The Portex 16-gauge needle demonstrated the best needle-stilette fit at the bevel.
    • All evaluated needles met satisfactory hardness standards.

    Conclusions:

    • Epidural needle design and manufacturing result in measurable differences in physical properties.
    • The 18-gauge Crawford needle shows superior surface smoothness and clearance, potentially improving ease of insertion and reducing tissue trauma.
    • Needle-stilette fit varies, with the Portex 16-gauge excelling at the bevel, which may influence procedural control.