Abstract
This work develops the first tubular microactuator functionalized by ferrofluid that enables both rotational and axial motions in a simultaneous or selective manner for endoscopic imaging and spectroscopy catheter applications. A layer of ferrofluid attracted on the magnetic rotor/slider lifts it off the inner walls of the catheter tube, offering a near friction-less electromagnetic revolution of the rotor and/or its sliding motion along the catheter’s axis controlled by a fluidic pressure. A device prototype coupled with a prism mirror is microfabricated and evaluated to verify the effectiveness of the device design for 3-dimesnional (3D) scanning of a probing laser beam. Measurements show a superior revolving stability along its axis compared to the preceding design without axial motion function. An application of angle-resolved endoscopic Raman spectroscopy is experimentally demonstrated through an ex-vivo test using mouse tissue. The study suggests a promising potential of the microactuator for 3D endoscopic applications with Raman spectroscopy and likely with other modalities including ultrasound and optical coherence tomography.
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