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Design optimization study of a shape memory alloy active needle for biomedical applications.

Bardia Konh1, Mohammad Honarvar1, Parsaoran Hutapea1

  • 1Department of Mechanical Engineering, Temple University, Philadelphia, PA 19122, USA.

Medical Engineering & Physics
|March 19, 2015
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Summary

Active needles utilize shape memory alloys (SMAs) for precise cancer intervention navigation. This study optimized SMA-actuated needle design for enhanced maneuverability and accuracy in percutaneous procedures.

Keywords:
Active surgical needleActuatorDesign optimizationShape memory

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Robotics

Background:

  • Percutaneous cancer interventions require precise needle navigation.
  • Current methods face challenges in achieving target accuracy.
  • Active needles offer a potential solution using shape memory alloys (SMAs).

Purpose of the Study:

  • To investigate the actuation capabilities of SMA wires for active needles.
  • To optimize the design of SMA-actuated needles for maximum flexibility and steerability.
  • To integrate SMA material models with automated optimization techniques for improved needle design.

Main Methods:

  • Simulated SMA stress-strain curves using a MATLAB implementation of the Brinson model.
  • Developed a material model for finite element analysis (FEA) and validated it experimentally.
  • Optimized active needle design using a genetic algorithm, considering parameters like diameter and pre-strain.

Main Results:

  • Successfully simulated and experimentally validated SMA actuation capabilities.
  • Developed and validated an FEA model for active needle prototypes.
  • Achieved an optimized active needle design with enhanced flexibility and steerability through genetic algorithm optimization.

Conclusions:

  • SMA actuation is effective for enhancing surgical needle maneuverability.
  • FEA and genetic algorithms are valuable tools for active needle design optimization.
  • The integrated approach led to an improved active needle design for precise percutaneous interventions.