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Three-dimensional Electrodes formation using liquid metal in micro channels for 3-axis Capacitive Force Sensor.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 25, 2017
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    Summary

    Researchers developed a miniaturized 3-axis capacitive force sensor using liquid metal electrodes. This advancement enables endoscopic palpation, overcoming previous size limitations for medical device integration.

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    Area of Science:

    • Materials Science
    • Biomedical Engineering
    • Sensor Technology

    Background:

    • Miniaturization of medical devices is critical for minimally invasive procedures like endoscopy.
    • Previous capacitive force sensors faced challenges in achieving the required size reduction for endoscopic applications.
    • Developing integrated sensors for tactile feedback during endoscopic procedures is an ongoing challenge.

    Purpose of the Study:

    • To propose and demonstrate a miniaturized three-dimensional liquid metal electrode fabrication method.
    • To develop a compact 3-axis capacitive force sensor suitable for endoscopic integration.
    • To enable tactile feedback for endoscopic palpation through advanced sensor technology.

    Main Methods:

    • Fabrication of three-dimensional microchannels by stacking polydimethylsiloxane (PDMS) layers.
    • Introduction of liquid metal (galinstan) into microchannels to form electrodes and wirings.
    • Manufacturing and experimental characterization of a 5 mm diameter, 3-axis cylindrical capacitive force sensor.

    Main Results:

    • Successful fabrication of a miniaturized 3-axis cylindrical capacitive force sensor.
    • The sensor's dimensions (5 mm diameter) are suitable for mounting onto an endoscope.
    • Experimental characterization confirmed the sensor's functionality for force measurement.

    Conclusions:

    • The proposed liquid metal electrode fabrication technique enables the development of miniaturized sensors.
    • The developed 3-axis capacitive force sensor is readily applicable for endoscopic palpation.
    • This technology has the potential to enhance diagnostic capabilities in endoscopic procedures.