Simulation of airbag impact on eyes after photorefractive keratectomy by finite element analysis method

Uchio, Eiichi; Watanabe, Yoichiro; Kadonosono, Kazuaki; Matsuoka, Yasuhiro; Goto, Satoru

doi:10.1007/s00417-003-0679-8

Cited by 32 publications

(18 citation statements)

References 32 publications

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“…Both were defined as 0.2 mm and assigned a tensile strength of 20 MPa. The initial approximation is supported by the high tensile strength 2001reported for collagen and the large amount of collagen in these structures (Power 2001;Uchio et al 2001Uchio et al , 2003.…”

Section: Geometric Modelling and Materials Propertiesmentioning

confidence: 98%

“…The cornea was loaded with the intra-ocular pressure on the posterior surface and with the atmospheric pressure on the anterior surface. The loading produced by the eyelids was ignored (Kobayashi et al 1971;Uchio et al 2003). The FEM was loaded with multiple force vectors to simulate muscle forces over wide areas of attachment as described by Al-Sukhun et al (in press; tables 2 and 3).…”

Section: Geometric Modelling and Materials Propertiesmentioning

confidence: 99%

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Modelling of orbital deformation using finite-element analysis

Al-Sukhun

Lindqvist

Kontio

2005

J. R. Soc. Interface.

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The purpose of this study was to develop a three-dimensional finite-element model (FEM) of the human orbit, containing the globe, to predict orbital deformation in subjects following a blunt injury. This study investigated the hypothesis that such deformation could be modelled using finite-element techniques. One patient who had CT-scan examination to the maxillofacial skeleton including the orbits, as part of her treatment, was selected for this study. A FEM of one of the orbits containing the globe was constructed, based on CT-scan images. Simulations were performed with a computer using the finite-element software NISA (EMRC, Troy, USA). The orbit was subjected to a blunt injury of a 0.5 kg missile with 30 m s K1 velocity. The FEM was then used to predict principal and shear stresses or strains at each node position. Two types of orbital deformation were predicted during different impact simulations: (i) horizontal distortion and (ii) rotational distortion. Stress values ranged from 213.4 to 363.3 MPa for the maximum principal stress, from K327.8 to K653.1 MPa for the minimum principal stress, and from 212.3 to 444.3 MPa for the maximum shear stress. This is the first finite-element study, which demonstrates different and concurrent patterns of orbital deformation in a subject following a blunt injury. Finite element modelling is a powerful and invaluable tool to study the multifaceted phenomenon of orbital deformation.

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Section: Geometric Modelling and Materials Propertiesmentioning

confidence: 98%

Section: Geometric Modelling and Materials Propertiesmentioning

confidence: 99%

Modelling of orbital deformation using finite-element analysis

Al-Sukhun

Lindqvist

Kontio

2005

J. R. Soc. Interface.

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“…The finite element method has been used to simulate the effects of radial keratotomy,[42-45] astigmatic keratotomy,[46-48], cataract incisions[49], phototherapeutic keratectomy,[50, 51] PRK[52, 53] and LASIK,[53-57] intracorneal ring segments,[58] and keratoconus[55, 59, 60] on the corneal structure. A more recent emphasis on use of patient-specific geometries obtained from clinical imaging devices has begun to bridge the gap between generalized results and more direct clinical validation of models, an important step toward use of simulation in clinical practice [7, 29, 49, 54, 61].…”

Section: Corneal Biomechanicsmentioning

confidence: 99%

Translating Ocular Biomechanics into Clinical Practice: Current State and Future Prospects

Girard

Dupps

Baskaran

et al. 2014

Current Eye Research

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Biomechanics – the study of the relationship between forces and function in living organisms – is thought to play a critical role in a significant number of ophthalmic disorders. This is not surprising, as the eye is a pressure vessel that requires a delicate balance of forces to maintain its homeostasis. Over the past few decades, basic science research in ophthalmology mostly confirmed that ocular biomechanics could explain in part the mechanisms involved in almost all major ophthalmic disorders such as optic nerve head neuropathies, angle closure, ametropia, presbyopia, cataract, corneal pathologies, retinal detachment, and macular degeneration. Translational biomechanics in ophthalmology, however, is still in its infancy. It is believed that its use could make significant advances in diagnosis and treatment. Several translational biomechanics strategies are already emerging, such as corneal stiffening for the treatment of keratoconus, and more are likely to follow. This review aims to cultivate the idea that biomechanics plays a major role in ophthalmology and that its clinical translation, lead by collaborative teams of clinicians and biomedical engineers, will benefit our patients. Specifically, recent advances and future prospects in corneal, iris, trabecular meshwork, crystalline lens, scleral and lamina cribrosa biomechanics are discussed.

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“…Numerical simulation has been considered as an effect method to investigate ocular trauma (Uchio et al 1999(Uchio et al , 2003Stitzel et al 2002Stitzel et al , 2005Gray et al 2011;Weaver et al 2011). This method not only allows unmixed explosion condition on the eye but also provides a quantitative analysis of the injuries.…”

Section: Introductionmentioning

confidence: 98%

Prediction of globe rupture caused by primary blast: a finite element analysis

Liu

Wang

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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Although a human eye comprises less than 0.1% of the frontal body surface area, injuries to the eye are found to be disproportionally common in survivors of explosions. This study aimed to introduce a Lagrangian-Eulerian coupling model to predict globe rupture resulting from primary blast effect. A finite element model of a human eye was created using Lagrangian mesh. An explosive and its surrounding air domain were modelled using Eulerian mesh. Coupling the two models allowed simulating the blast wave generation, propagation and interaction with the eye. The results showed that the peak overpressures caused by blast wave on the corneal apex are 2080, 932.1 and 487.3 kPa for the victim distances of 0.75, 1.0 and 1.25 m, respectively. Higher stress occurred at the limbus, where the peaks for the three victim distances are 25.5, 14.1 and 6.4 MPa. The overpressure threshold of globe rupture was determined as 2000 kPa in a small-scale explosion. The findings would provide insights into the mechanism of primary blast-induced ocular injuries.

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Simulation of airbag impact on eyes after photorefractive keratectomy by finite element analysis method

Cited by 32 publications

References 32 publications

Modelling of orbital deformation using finite-element analysis

Modelling of orbital deformation using finite-element analysis

Translating Ocular Biomechanics into Clinical Practice: Current State and Future Prospects

Prediction of globe rupture caused by primary blast: a finite element analysis

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