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Wet Beveling of Microinjection Needles Utilizing Constant Air Pressure for Feedback on Needle Opening
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Needle-Tissue Interaction Forces for Bevel-Tip Steerable Needles.

Sarthak Misra, Kyle B Reed, Andrew S Douglas

    Proceedings of the ... IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics. IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics
    |October 25, 2011
    PubMed
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    Needle deflection during insertion into soft tissue was modeled by analyzing forces at the bevel tip. Rupture toughness significantly influences these forces, crucial for developing mechanics-based needle steering models.

    Area of Science:

    • Biomechanics
    • Medical device engineering
    • Materials science

    Background:

    • Bevel-tip needles naturally bend upon insertion into soft tissue due to their asymmetric design.
    • Understanding needle-tip mechanics is essential for developing accurate models of needle insertion and steering.

    Purpose of the Study:

    • To determine the forces acting at the bevel tip of a needle during soft tissue insertion.
    • To develop a mechanics-based model for needle deflection and steering.

    Main Methods:

    • Measured rupture toughness and nonlinear elasticity of soft tissue simulants and chicken tissue.
    • Developed a finite element model incorporating contact and cohesive zone models to simulate tissue cleavage.
    • Investigated sensitivity of tip forces to tissue properties and needle bevel angle.

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    Main Results:

    • Needle tip forces are highly sensitive to the rupture toughness of the tissue.
    • Nonlinear elasticity and bevel angle also influence tip forces, but to a lesser extent than rupture toughness.
    • The finite element model successfully simulated tissue cleavage.

    Conclusions:

    • Rupture toughness is a critical parameter in modeling bevel-tip needle-tissue interaction.
    • This study provides foundational data for a mechanics-based model of needle steering.
    • Findings extend previous kinematic models with a more comprehensive mechanical approach.