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Thin-Walled Hollow Shafts

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...

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Related Experiment Video

Updated: Oct 2, 2025

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Published on: April 4, 2013

Decoupling Steerability from Diameter: Helical Dovetail Laser Patterning for Steerable Needles.

Margaret Rox¹, Maxwell Emerson¹, Tayfun Efe Ertop¹

¹Department of Mechanical Engineering and the Vanderbilt Institute for Surgery and Engineering at Vanderbilt University, Nashville, TN 37203, USA.

IEEE Access : Practical Innovations, Open Solutions

|February 24, 2022

Summary

This summary is machine-generated.

A novel helical dovetail laser patterning enhances steerable needle curvature by adjusting shaft stiffness independently of diameter. This allows for larger, clinically relevant needle sizes, improving payload delivery and enabling new interventional tools.

Keywords:

Medical Devices Medical Robotics Steerable Needles Surgical Robotics

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Last Updated: Oct 2, 2025

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Area of Science:

Medical Devices
Robotics
Biomedical Engineering

Background:

Steerable needle curvature is limited by shaft stiffness and diameter.
Small diameters, often used to increase curvature, restrict payload capacity and risk shaft shearing.
Existing designs struggle to balance steerability with clinical payload requirements.

Purpose of the Study:

To introduce a novel method for enhancing steerable needle curvature.
To decouple needle steerability from shaft diameter, enabling selection based on payload needs.
To demonstrate the efficacy of this new design in various soft tissues and for payload delivery.

Main Methods:

Development of helical dovetail laser patterning for needle shafts.
Experimental testing in tissue phantoms and ex vivo animal tissues (muscle, brain, liver, lung).
Evaluation of targeting accuracy with established controllers and demonstration of payload delivery (brachytherapy seeds, radiofrequency ablation).

Main Results:

Helical dovetail patterning significantly increases needle steerability without reducing shaft diameter.
High steerability was demonstrated across various soft tissues using clinically relevant needle diameters.
Accurate targeting and successful interventional payload delivery were achieved with the modified needles.

Conclusions:

Helical dovetail patterning offers a new approach to designing steerable needles, separating steerability from diameter.
This innovation allows needle diameter to be chosen based on clinical payload requirements, overcoming previous limitations.
The technology facilitates the integration of advanced sensors and interventional tools into high-curvature steerable needles.