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Dual-Stiffness Force-Sensing Cannulation Tool for Retinal Microsurgery.

Changyan He, Emily Yang, Iulian Iordachita

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 18, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study developed a novel sensorized tool for retinal vein cannulation, improving safety by precisely measuring delicate forces during the procedure. The tool accurately detects forces at the vein and sclera, preventing eye injury during treatment for retinal vein occlusion.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Surgical Instrumentation

    Background:

    • Retinal vein occlusion (RVO) is a leading cause of vision loss.
    • Retinal vein cannulation offers a promising treatment for RVO by delivering anticoagulants directly to the occluded vein.
    • Current cannulation techniques lack precise force feedback, risking ocular injury due to the significant difference in forces required for vein puncture versus scleral contact.

    Purpose of the Study:

    • To develop and validate a sensorized cannulation tool for precise force detection during retinal vein cannulation.
    • To address the challenge of managing tool-to-tissue forces at vastly different scales (mN for veins, 100 mN for sclera).
    • To enhance the safety and efficacy of retinal vein cannulation procedures.

    Main Methods:

    • Development of a dual-stiffness cannulation tool combining a flexible nitinol tip with a stiffer stainless steel shaft.
    • Integration of three fiber Bragg grating (FBG) sensors to measure transverse forces at the tip and sclerotomy, and to determine tool insertion depth.
    • Calibration and validation of the sensorized tool using experimental measurements.

    Main Results:

    • The sensorized tool accurately detected tool-tip forces (RMS error: 0.70 mN) and sclerotomy forces (RMS error: 1.59 mN).
    • Tool insertion depth was measured with high accuracy (RMS error: 0.69 mm).
    • The dual-stiffness design enabled sensitive detection of small vein puncture forces while maintaining tool integrity.

    Conclusions:

    • The developed sensorized cannulation tool effectively measures critical forces during retinal vein cannulation.
    • This technology has the potential to significantly reduce the risk of ocular injury associated with the procedure.
    • Precise force monitoring represents a crucial advancement for the safety and success of retinal vein cannulation treatments.