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Related Experiment Videos

Resistance forces acting on suture needles.

T B Frick1, D D Marucci, J A Cartmill

  • 1University of New South Wales, Prince of Wales Hospital, Orthopaedic Research Laboratories, Renswick, NSW 2031, Australia.

Journal of Biomechanics
|August 28, 2001
PubMed
Summary
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Increasing tissue tension significantly increases suture needle penetration force. Needle speed had no effect. This research aids robotic surgery and VR simulator development by modeling tissue resistance.

Area of Science:

  • Biomechanics
  • Surgical Technology
  • Materials Science

Background:

  • Accurate measurement of suture needle forces is crucial for advancing robotic surgery and virtual reality surgical simulators.
  • Understanding tissue resistance during needle penetration informs the design of surgical tools and haptic feedback systems.

Purpose of the Study:

  • To quantify the resistance forces encountered by a suture needle penetrating biological tissues under varying tension.
  • To investigate the influence of tissue tension and needle displacement rate on penetration resistance.

Main Methods:

  • Sheep Achilles tendons and skin were subjected to controlled static loads (0.98–19.6 N).
  • A 2/0 cutting suture needle was used with a materials testing machine to measure penetration force and stiffness at velocities of 1, 5, and 10 mm/s.

Related Experiment Videos

  • Load-displacement data was continuously recorded for analysis.

    • Main Results:

    • Increased tissue tension (in both skin and tendon) significantly increased the force required for needle penetration (p<0.05).
    • Needle displacement velocity did not significantly affect the resistance encountered during penetration (p<0.05).
    • Skin penetration curves showed two distinct peaks, indicating initial entry and emergence forces.

    Conclusions:

    • Tissue tension is a critical factor influencing suture needle penetration resistance.
    • The study provides a foundational model for measuring force feedback in soft tissue needle penetration.
    • Findings are applicable to the development of more realistic surgical simulators and robotic systems.