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    Flexible needles for surgery are crucial. A 60° tip angle offers predictable tissue displacement for better steering with minimal trauma, unlike sharper angles.

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    Area of Science:

    • Medical Devices
    • Surgical Robotics
    • Biomaterials

    Background:

    • Minimally invasive surgery benefits from steerable needles.
    • Needle shape significantly impacts tissue interaction and target access.
    • Understanding needle-tissue mechanics is vital for surgical precision.

    Purpose of the Study:

    • To investigate the effect of needle tip design on tissue deformation during insertion.
    • To analyze strains and displacements around the insertion axis using Digital Image Correlation.
    • To provide insights into needle shapes that minimize tissue trauma and optimize steering.

    Main Methods:

    • Utilized Digital Image Correlation (DIC) for high-resolution observation of internal tissue deformation.
    • Employed a stable, plane-strain configuration for needle insertion experiments.
    • Tested various needle tip designs, focusing on included bevel angles.

    Main Results:

    • Needle tips with bevel angles up to 40° caused asymmetric tissue displacement.
    • A 60° included tip angle resulted in more predictable tissue displacement patterns.
    • The 60° tip angle demonstrated potential for enhanced steering forces with minimal adverse effects.

    Conclusions:

    • Needle tip geometry is a critical factor in controlling needle-tissue interactions.
    • A 60° bevel angle appears optimal for achieving predictable tissue displacement and effective steering in soft tissue phantoms.
    • Findings can inform the design of flexible, steerable needles for improved minimally invasive surgical procedures.