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Ophthalmic needles. An engineering analysis.

L Bendel, E Reynolds, F Stoffel

    Ophthalmology
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Mechanical engineering formulas predict surgical needle flex and bend strength. Smaller, optimally designed needles can match larger ones in performance and corneal penetration force.

    Area of Science:

    • Mechanical Engineering
    • Biomedical Engineering
    • Materials Science

    Background:

    • Surgical needle performance is critical for ophthalmic procedures.
    • Predicting needle flex and bend strength is essential for design and safety.
    • Current needle designs may not be optimized for strength-to-penetration force ratios.

    Purpose of the Study:

    • To present mechanical engineering formulas for predicting surgical needle flex and bend strength.
    • To measure the bend strength of ophthalmic needles made from different materials and shapes.
    • To evaluate the force required for corneal penetration and develop a needle strength/penetration force ratio.

    Main Methods:

    • Developed theoretical models for needle flex and bend strength based on mechanical engineering principles.

    Related Experiment Videos

  • Conducted experimental measurements of bend strength on ophthalmic needles.
  • Measured the force required to penetrate porcine corneas using a standardized testing apparatus.

    • Main Results:

    • Excellent agreement was found between theoretical predictions and experimental measurements of needle bend strength.
    • Bend strength varied significantly with material composition and needle shape.
    • A novel needle strength/penetration force ratio was established.
    • Optimally designed needles using smaller wire sizes demonstrated comparable performance to larger needles.

    Conclusions:

    • Mechanical engineering principles accurately predict surgical needle performance.
    • Optimized needle design, particularly using smaller wire diameters, can enhance efficiency and potentially reduce tissue trauma.
    • The developed strength-to-penetration force ratio offers a valuable metric for evaluating and designing surgical needles.