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FBG-Based Transverse and Axial Force-Sensing Micro-Forceps for Retinal Microsurgery.

Berk Gonenc1, Iulian Iordachita1

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Proceedings of IEEE Sensors. IEEE International Conference on Sensors
|August 28, 2018
PubMed
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This study introduces enhanced microsurgical tools for retinal membrane peeling, improving force detection. A new nonlinear method accurately measures both transverse and axial forces for safer ophthalmic surgery.

Keywords:
fiber Bragg gratingforce sensingmicro-forceps

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Area of Science:

  • Ophthalmic Surgery
  • Biomedical Engineering
  • Surgical Instrumentation

Background:

  • Retinal microsurgery, particularly membrane peeling, demands precise manipulation of delicate tissues.
  • Existing ophthalmic tools lack comprehensive force feedback, relying on surgeon's tactile perception.
  • Previous work introduced fiber Bragg grating (FBG) sensors for transverse force detection in surgical tools.

Purpose of the Study:

  • To develop and validate an improved microsurgical instrument capable of measuring both transverse and axial forces during retinal membrane peeling.
  • To compare the accuracy of linear and nonlinear methods for calculating forces from sensor data.
  • To enhance surgical precision and safety in delicate ophthalmic procedures.

Main Methods:

  • Integration of an additional axial force sensor into existing FBG-sensitized ophthalmic tools.
  • Development and investigation of two distinct fitting methods (linear and nonlinear) to compute transverse and axial forces from combined sensor outputs.
  • Validation of the methods using random samples to assess prediction accuracy for both force components.

Main Results:

  • The linear fitting method accurately predicted transverse forces but showed insufficient accuracy for axial load.
  • The nonlinear fitting method demonstrated improved accuracy and consistency in measuring both transverse and axial forces.
  • The enhanced tool design successfully captured significant axial forces, often imperceptible to the surgeon.

Conclusions:

  • The developed nonlinear method provides a more accurate and reliable measurement of forces during retinal microsurgery.
  • The enhanced surgical tool with dual-axis force sensing capability offers potential for improved outcomes in membrane peeling procedures.
  • Accurate measurement of both transverse and axial forces is crucial for advancing the safety and efficacy of ophthalmic microsurgery.