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Related Experiment Videos

Surgical needle sharpness.

J G Thacker1, G T Rodeheaver, M A Towler

  • 1Department of Plastic Surgery, University of Virginia School of Medicine, Charlottesville 22908.

American Journal of Surgery
|March 1, 1989
PubMed
Summary
This summary is machine-generated.

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A new test measures surgical needle sharpness by penetration force. Smaller diameter, honed, and specific alloy needles (Ethicon) are significantly sharper, reducing surgical risks.

Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Surgical Technology

Background:

  • Surgical needle sharpness is critical for minimizing tissue trauma during procedures.
  • Objective quantification of needle sharpness is needed for quality control and comparative analysis.

Purpose of the Study:

  • To develop and validate a reproducible test for assessing surgical needle sharpness.
  • To identify key factors influencing surgical needle sharpness, including manufacturing processes and material composition.

Main Methods:

  • A standard test was developed measuring the maximum force required for needle penetration through a synthetic membrane.
  • Three groups of reversed cutting-edge needles from different manufacturers were tested.
  • Scanning electron microscopy (SEM) and elemental analysis were used to correlate physical characteristics with sharpness.

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Main Results:

  • Needle diameter, manufacturing method (electrohoned/hand-honed vs. machine ground), and manufacturer significantly impact sharpness.
  • Smaller diameter needles exhibited greater sharpness.
  • Ethicon needles were found to be the sharpest, followed by Davis & Geck and Deknatel.
  • Sharper needles possessed long, narrow cutting edges and were made from ASTM 45500 stainless steel alloy.

Conclusions:

  • The developed test provides a reliable method for evaluating surgical needle sharpness.
  • Needle sharpness is influenced by a combination of design, manufacturing, and material properties.
  • The use of superior materials like ASTM 45500 stainless steel enables the production of sharper, more robust surgical needles, enhancing surgical safety.