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Abraded optical fibre-based dynamic range force sensor for tissue palpation.

Abu Bakar Dawood1, Vamsi Krishna Chavali1, Thomas Mack1

  • 1School of Engineering and Materials Science, Queen Mary University of London, London, United Kingdom.

Frontiers in Robotics and AI
|November 26, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel sensor for minimally invasive surgery, offering adjustable stiffness and haptic feedback. The device enhances tactile sensing capabilities, crucial for surgical precision and tissue differentiation.

Keywords:
dynamic range force sensorfibre optic sensorminimally invasive surgeryoptical sensingsoft force sensortissue palpation

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Area of Science:

  • Biomedical Engineering
  • Surgical Technology
  • Haptic Feedback Systems

Background:

  • Tactile information is vital for surgical surface characterization and tissue differentiation.
  • Minimally Invasive Surgery (MIS) presents challenges due to restricted access and reduced tactile feedback for surgeons.
  • Enhanced haptic feedback is needed to improve surgical performance in MIS.

Purpose of the Study:

  • To develop a novel, stiffness-controllable, dynamic force range sensor for remote haptic feedback.
  • To enable improved tactile sensing during minimally invasive surgical procedures.
  • To investigate the sensor's ability to provide adjustable force measurement ranges and estimate tissue stiffness.

Main Methods:

  • Integration of an abraded optical fibre within a silicone dome.
  • Utilizing light attenuation changes due to fiber curvature for force sensing.
  • Adjusting sensor stiffness and force measurement range by modifying internal dome pressure.
  • Experimental validation with force measurements and phantom stiffness estimation.

Main Results:

  • The sensor demonstrated stiffness controllability by adjusting internal pressure.
  • Increasing internal pressure expanded the force measurement range (up to 8.83 N at 1 psi).
  • The sensor successfully estimated elastic moduli of phantoms within a range of 8.58 to 165.32 kPa.

Conclusions:

  • The developed sensor effectively provides stiffness-controllable, dynamic force range sensing.
  • This technology has the potential to restore and enhance tactile feedback in minimally invasive surgery.
  • The sensor's ability to measure force and estimate stiffness offers valuable data for surgical guidance.