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Method to Reduce Target Motion Through Needle-Tissue Interactions.

Matthew J Oldfield1, Alexander Leibinger1, Tian En Timothy Seah1

  • 1Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.

Annals of Biomedical Engineering
|May 7, 2015
PubMed
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A novel multi-segment needle design significantly reduces target motion during minimally invasive surgery. Cyclic strokes and retraction minimize tissue deformation, improving surgical accuracy and reducing the need for intra-operative imaging.

Area of Science:

  • Biomedical Engineering
  • Surgical Robotics
  • Medical Device Design

Background:

  • Minimally invasive surgery requires precise needle delivery to target tissue volumes.
  • Needle insertion causes tissue deformation and target motion, complicating procedures.
  • Reducing reliance on intra-operative imaging is crucial for efficiency and safety.

Purpose of the Study:

  • To propose a novel multi-segment needle design and delivery mechanism.
  • To investigate methods for reducing target motion during needle insertion.
  • To minimize tissue deformation and improve surgical accuracy.

Main Methods:

  • Three-dimensional finite element simulations of needle insertion into simulated tissue.
  • Experimental validation using a gelatine tissue phantom and digital image correlation.
Keywords:
BiomimeticDigital image correlationFinite element methodFrictionGelatineNeedle insertionSoft tissueTool–tissue interaction

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  • Analysis of multi-segment needle motion profiles, including cyclic strokes and retraction.

    • Main Results:

    • Simulations showed reduced target motion with cyclic needle strokes and slight retraction.
    • Experiments confirmed statistically significant reductions in target motion: over 8% with cyclic strokes and 29% with added retraction.
    • The net insertion speed remained constant while motion was reduced.

    Conclusions:

    • A multi-segment needle design effectively reduces target motion ahead of the advancing needle.
    • Frictional interactions on the needle surface are key to minimizing unwanted tissue movement.
    • This approach offers a promising method to enhance precision in minimally invasive procedures.