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Related Concept Videos

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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FBG-based three-dimensional micro-force sensor with axial force sensitivity-enhancing and temperature compensation

Xiaodong Zhang, Hongcheng Liu, Yachun Wang

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    |December 2, 2023
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    This study introduces a novel fiber Bragg grating (FBG) 3-D micro-force sensor for ophthalmic microsurgery forceps. The sensor accurately measures micro tool-tissue interaction forces, enhancing surgical safety and precision.

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    Area of Science:

    • Biomedical Engineering
    • Surgical Robotics
    • Optical Sensing Technologies

    Background:

    • Excessive interaction force during retinal microsurgery can lead to severe intraocular tissue damage and vision loss.
    • Accurate micro tool-tissue force sensing is critical for ophthalmic microsurgery robots to prevent surgical accidents.

    Purpose of the Study:

    • To develop and validate a novel fiber Bragg grating (FBG) based three-dimensional (3-D) micro-force sensor for micro-forceps used in ophthalmic microsurgery.
    • To enhance the sensitivity of axial force measurement and provide simultaneous temperature compensation for both axial and transverse forces.

    Main Methods:

    • Integration of an FBG 3-D micro-force sensor with a micro-forceps end-effector for ophthalmic surgical robots.
    • Implementation of an axial force sensitivity-enhancing structure utilizing flexure-hinge and flexible lever principles.
    • Adoption of a dual-grating temperature compensation method for axial force measurement and arrangement of three FBGs for transverse force measurement and compensation.

    Main Results:

    • The developed micro-forceps achieved a force resolution of 0.13 mN for transverse forces and 0.30 mN for axial forces.
    • Experimental validation confirmed the sensor's capability for simultaneous temperature compensation in both axial and transverse force measurements.
    • The sensor system demonstrated effective integration and functionality as an end-effector for ophthalmic surgical robots.

    Conclusions:

    • The proposed FBG 3-D micro-force sensor significantly improves the safety and precision of ophthalmic microsurgery by enabling accurate tool-tissue interaction force sensing.
    • The innovative design overcomes previous limitations in axial force sensitivity and provides robust temperature compensation, crucial for delicate intraocular procedures.
    • This sensor technology holds potential for advancing robotic-assisted ophthalmic surgery and reducing the risk of iatrogenic injuries.