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  1. Artikel ; Online: Effect of twisting of intravitreal injections on ocular bio-mechanics: a novel insight to ocular surgery.

    Siddharth, Ashish / Bhandari, Ajay / Singh, Sarthak S / Udai, Arun Dayal

    Biomechanics and modeling in mechanobiology

    2024  Band 23, Heft 3, Seite(n) 1013–1030

    Abstract: Although intravitreal (IVT) injections provide several advantages in treating posterior segment eye diseases, several associated challenges remain. The current study uses the finite element method (FEM) to highlight the effect of IVT needle rotation ... ...

    Abstract Although intravitreal (IVT) injections provide several advantages in treating posterior segment eye diseases, several associated challenges remain. The current study uses the finite element method (FEM) to highlight the effect of IVT needle rotation along the insertion axis on the reaction forces and deformation inside the eye. A comparison of the reaction forces at the eye's key locations has been made with and without rotation. In addition, a sensitivity analysis of various parameters, such as the needle's angular speed, insertion location, angle, gauge, shape, and intraocular pressure (IOP), has been carried out to delineate the individual parameter's effect on reaction forces during rotation. Results demonstrate that twisting the needle significantly reduces the reaction forces at the penetration location and throughout the needle travel length, resulting in quicker penetration. Moreover, ocular biomechanics are influenced by needle insertion location, angle, shape, size, and IOP. The reaction forces incurred by the patient may be reduced by using a bevel needle of the higher gauge when inserted close to the normal of the local scleral surface toward the orra serrata within the Pars Plana region. Results obtained from the current study can deepen the understanding of the twisting needle's interaction with the ocular tissue.
    Mesh-Begriff(e) Intravitreal Injections ; Humans ; Finite Element Analysis ; Biomechanical Phenomena ; Intraocular Pressure/drug effects ; Intraocular Pressure/physiology ; Needles ; Eye ; Rotation ; Ophthalmologic Surgical Procedures ; Models, Biological
    Sprache Englisch
    Erscheinungsdatum 2024-02-15
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2093052-5
    ISSN 1617-7940 ; 1617-7959
    ISSN (online) 1617-7940
    ISSN 1617-7959
    DOI 10.1007/s10237-024-01819-5
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Verfügbar in ZB MED Köln/Königswinter

    Zs.A 5966: Hefte anzeigen Standort:
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  2. Artikel ; Online: Image-based insilico investigation of hemodynamics and biomechanics in healthy and diabetic human retinas.

    Tripathy, Kartika Chandra / Siddharth, Ashish / Bhandari, Ajay

    Microvascular research

    2023  Band 150, Seite(n) 104594

    Abstract: Retinal hemodynamics and biomechanics play a significant role in understanding the pathophysiology of several ocular diseases. However, these parameters are significantly affected due to changed blood vessel morphology ascribed to pathological conditions, ...

    Abstract Retinal hemodynamics and biomechanics play a significant role in understanding the pathophysiology of several ocular diseases. However, these parameters are significantly affected due to changed blood vessel morphology ascribed to pathological conditions, particularly diabetes. In this study, an image-based computational fluid dynamics (CFD) model is applied to examine the effects of changed vascular morphology due to diabetes on blood flow velocity, vorticity, wall shear stress (WSS), and oxygen distribution and compare it with healthy. The 3D patient-specific vascular architecture of diabetic and healthy retina is extracted from Optical Coherence Tomography Angiography (OCTA) images and fundus to extract the capillary level information. Further, Fluid-structure interaction (FSI) simulations have been performed to compare the induced tissue stresses in diabetic and healthy conditions. Results illustrate that most arterioles possess higher velocity, vorticity, WSS, and lesser oxygen concentration than arteries for healthy and diabetic cases. However, an opposite trend is observed for venules and veins. Comparisons show that, on average, the blood flow velocity in the healthy case decreases by 42 % in arteries and 21 % in veins, respectively, compared to diabetic. In addition, the WSS and von Mises stress (VMS) in healthy case decrease by 49 % and 72 % in arteries and by 6 % and 28 % in veins, respectively, when compared with diabetic, making diabetic blood vessels more susceptible to wall rupture and tissue damage. The in-silico results may help predict the possible abnormalities region early, helping the ophthalmologists use these estimates as prognostic tools and tailor patient-specific treatment plans.
    Mesh-Begriff(e) Humans ; Biomechanical Phenomena ; Models, Cardiovascular ; Hemodynamics ; Retina ; Blood Flow Velocity ; Diabetes Mellitus ; Stress, Mechanical ; Hydrodynamics
    Sprache Englisch
    Erscheinungsdatum 2023-08-12
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80307-8
    ISSN 1095-9319 ; 0026-2862
    ISSN (online) 1095-9319
    ISSN 0026-2862
    DOI 10.1016/j.mvr.2023.104594
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Volltext online

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    Verfügbar in ZB MED Köln/Königswinter

    Zs.A 746: Hefte anzeigen Standort:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

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