1. Articles from Jin-Hui Shen

    1-5 of 5
    1. Investigation of Micro-motion Kinematics of Continuum Robots for Volumetric OCT and OCT-guided Visual Servoing

      Investigation of Micro-motion Kinematics of Continuum Robots for Volumetric OCT and OCT-guided Visual Servoing

      Continuum robots (CR) have been recently shown capable of micron-scale motion resolutions. Such motions are achieved through equilibrium modulation using indirect actuation for altering either internal preload forces or changing the cross-sectional stiffness along the length of a continuum robot. Previously reported, but unexplained, turning point behavior is modeled using two approaches. An energy minimization approach is first used to explain the source of this behavior. Subsequently, a kinematic model using internal constraints in multi-backbone CRs is used to replicate this turning point behavior. An approach for modeling the micro-motion differential kinematics is presented using experimental data based on the ...

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    2. Evaluation of microsurgical tasks with OCT-guided and/or robot-assisted ophthalmic forceps

      Evaluation of microsurgical tasks with OCT-guided and/or robot-assisted ophthalmic forceps

      Real-time intraocular optical coherence tomography (OCT) visualization of tissues with surgical feedback can enhance retinal surgery. An intraocular 23-gauge B-mode forward-imaging co-planar OCT-forceps, coupling connectors and algorithms were developed to form a unique ophthalmic surgical robotic system. Approach to the surface of a phantom or goat retina by a manual or robotic-controlled forceps, with and without real-time OCT guidance, was performed. Efficiency of lifting phantom membranes was examined. Placing the co-planar OCT imaging probe internal to the surgical tool reduced instrument shadowing and permitted constant tracking. Robotic assistance together with real-time OCT feedback improved depth perception accuracy. The first-generation integrated ...

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    3. Preliminary Design and Evaluation of a B-Scan OCT-Guided Needle

      Preliminary Design and Evaluation of a B-Scan OCT-Guided Needle

      Real-time intraoperative B-scan optical coherence tomography (OCT) visualization of intraocular tissues is a desired ophthalmic feature during retinal procedures. A novel intraocular 25-gauge B-mode forward-imaging OCT probe was combined with a 36-gauge needle into a prototype instrument. Imaging of the needle tip itself and the effects of saline injection into a gelatin phantom were performed. A combined B-scan forward-imaging OCT-needle prototype was capable of real-time-imaging of saline injection into a gelatin phantom. Additional future miniaturization may permit this instrument to be an adjunctive real-time imaging and procedure tool for vitreoretinal surgery.

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    4. Miniature real-time intraoperative forward-imaging optical coherence tomography probe

      Miniature real-time intraoperative forward-imaging optical coherence tomography probe

      Optical coherence tomography (OCT) has a tremendous global impact upon the ability to diagnose, treat, and monitor eye diseases. A miniature 25-gauge forward-imaging OCT probe with a disposable tip was developed for real-time intraoperative ocular imaging of posterior pole and peripheral structures to improve vitreoretinal surgery. The scanning range was 2 mm when the probe tip was held 3-4 mm from the tissue surface. The axial resolution was 4-6 µm and the lateral resolution was 25-35 µm. The probe was used to image cellophane tape and multiple ocular structures

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    5. A miniature forward-imaging optical coherence tomography (OCT) probe

      A miniature forward-imaging optical coherence tomography (OCT) probe

      Optical coherence tomography (OCT) has had a tremendous global health impact upon the current ability to diagnose, treat, and monitor multiple eye diseases. We propose that a miniature forward-imaging OCT probe can be developed for real-time ocular imaging. A miniature 25-gauge forward-imaging probe was designed and developed to use with an 850 nm spectral-domain optical coherence tomography (SDOCT) system (Bioptigen, Inc. Durham, NC). Imaging parameters were determined. Ocular tissues were examined with the miniature OCT probe. A miniature SDOCT probe was developed with the scanning driver within the hand piece. The SDOCT fiber-scanning probe maximally transmitted power of 800 μW ...

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    1-5 of 5
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  2. Topics in the News

    1. (9 articles) National Institutes of Health
    2. (5 articles) Vanderbilt University
    3. (2 articles) Harvard University
    4. (2 articles) Massachusetts General Hospital
    5. (2 articles) Columbia University
    6. (2 articles) Duke University
    7. (1 articles) Leica
    8. (1 articles) NYU Grossman School of Medicine
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    A miniature forward-imaging optical coherence tomography (OCT) probe Miniature real-time intraoperative forward-imaging optical coherence tomography probe Preliminary Design and Evaluation of a B-Scan OCT-Guided Needle Evaluation of microsurgical tasks with OCT-guided and/or robot-assisted ophthalmic forceps Investigation of Micro-motion Kinematics of Continuum Robots for Volumetric OCT and OCT-guided Visual Servoing Precision of attenuation coefficient measurements by optical coherence tomography Machine learning classification of multiple sclerosis in children using optical coherence tomography Duke University Receives NIH Grant for Intraoperative OCT Guidance of Intraocular Surgery Duke University Receives NIH Grant for OCTA and Glaucoma Progression in the Non-Human Primate University of Alabama at Birmingham Receives NIH Grant for Development of a supercontinuum laser source interferometer with sub-micron resolution to understand tear film structure and function in dry eye disease Massachusetts General Hosptial Receives NIH Grant for Intravascular microstructural, chemical and biomechanical characterization of coronary plaques Theia Imaging, LLD Receives NIH Grant for A Widefield, Handheld OCT system for Patients who are Unable to Cooperate