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MR-compatible biopsy needle with enhanced tip force sensing.

Santhi Elayaperumal1, Jung Hwa Bae2, David Christensen3

  • 1Mechanical Engineering Dept., Stanford University.

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Summary
This summary is machine-generated.

This study introduces an instrumented biopsy needle with enhanced tip sensors for precise force measurement during medical procedures. This novel design improves accuracy, especially in challenging friction conditions, aiding physicians in MR-guided interventions.

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Area of Science:

  • Biomedical Engineering
  • Surgical Instrumentation
  • Medical Imaging

Background:

  • Accurate force sensing is crucial for minimally invasive procedures.
  • Existing instrumented needles face limitations in sensitivity and applicability in MR-guided settings.
  • Optical Fiber Bragg Gratings (FBGs) offer electromagnetic field immunity.

Purpose of the Study:

  • To develop and evaluate an instrumented biopsy needle with enhanced tip force sensing capabilities.
  • To improve the sensitivity of force measurement at the needle tip.
  • To ensure suitability for Magnetic Resonance (MR)-guided interventions.

Main Methods:

  • Integration of Fiber Bragg Gratings (FBGs) as sensors at the needle tip.
  • Incorporation of micro-machined holes to increase strain sensitivity.
  • Comparison of dynamic force measurements with a base-mounted sensor.
  • Evaluation of needle performance under varying friction conditions.

Main Results:

  • The new instrumented needle design successfully senses interaction forces directly at the tip.
  • Enhanced tip sensitivity, particularly for axial forces, was achieved.
  • The design maintains needle stiffness and strength.
  • Improved force detection was observed, especially with significant sleeve friction.

Conclusions:

  • The developed instrumented biopsy needle offers improved force sensing accuracy at the tip.
  • Its electromagnetic field immunity makes it suitable for MR-guided procedures.
  • The design advancements enhance physician control and safety during interventions.