What terms are used to describe needle performance in suturing?

Updated: Mar 05, 2020
  • Author: Desiree Ratner, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

The following terms are employed to describe various characteristics related to needle performance:

  • Strength - Resistance to deformation during repeated passes through tissue (ie, increased needle strength results in decreased tissue trauma); ultimate moment is the measure of maximum strength determined by bending the needle to 90°, and surgical-yield moment is the amount of angular deformation that can occur before permanent needle deformation results

  • Ductility - Resistance (of a needle) to breakage under a given amount of deformation or bending

  • Sharpness - Measure of the ability of the needle to penetrate tissue; factors affecting sharpness include the angle of the point and the taper ratio (ie, ratio of taper length to needle diameter)

  • Clamping moment - Stability of a needle in a needle holder, determined by measuring the interaction of the needle body with the jaws of the needle holder


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