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Related Experiment Video

Updated: Oct 9, 2025

Three-Dimensional Ultrasonic Needle Tip Tracking with a Fiber-Optic Ultrasound Receiver
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Axially rigid steerable needle with compliant active tip control.

M de Vries1, J Sikorski2,3, S Misra2,3

  • 1Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands.

Plos One
|December 16, 2021
PubMed
Summary
This summary is machine-generated.

A novel steerable needle for prostate high-dose-rate brachytherapy (HDR BT) offers precise curved path steering. This instrument achieves targeting accuracy comparable to rigid needles, enhancing clinical applicability.

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Area of Science:

  • Medical Devices
  • Surgical Robotics
  • Biomedical Engineering

Background:

  • Steerable instruments are crucial for precise access to deep targets in minimally invasive procedures.
  • Conventional instruments for prostate high-dose-rate brachytherapy (HDR BT) face limitations in navigating complex anatomy.

Purpose of the Study:

  • To introduce and validate a novel omnidirectional steerable instrument for prostate HDR BT.
  • To evaluate the instrument's steering capabilities, accuracy, and rigidity in simulated and ex-vivo environments.

Main Methods:

  • Design and finite element analysis of a steerable needle with an internal compliant mechanism.
  • Prototype validation through experiments using tissue simulants and ex-vivo bovine tissue.
  • Ultrasound imaging for real-time visualization and shape reconstruction during insertion.

Main Results:

  • The instrument demonstrated lateral tip steering up to 20 mm.
  • Mean targeting errors were 1.4 mm in simulants and 2 mm in ex-vivo tissue.
  • Steering response was found to be history-independent, and rigidity was maintained for path control.

Conclusions:

  • The steerable instrument provides accuracy similar to rigid needles while enabling curved path steering.
  • The design preserves axial and flexural rigidity for effective navigation in heterogeneous tissues.
  • This technology has the potential to overcome anatomical challenges in HDR BT without altering clinical workflow.