Biomechanical study on the edge shapes for penetrating keratoplasty

Lee, Heow Pueh; Zhuang, Hui

doi:10.1080/10255842.2011.571677

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…Each exploits the benefits of their particular shape and is tailored to the need of the individual diseased recipient corneas [86,87]. Asymmetric configurations, and in particular mushroom PK, are particularly suited to cases of thin, one-sided recipient corneas such as in very peripheral ectasias [82].…”

Section: Guiding Mushroom Penetrating Keratoplastymentioning

confidence: 99%

Intraoperative OCT for Lamellar Corneal Surgery: A User Guide

Moramarco

Geronimo

Airaldi

et al. 2023

JCM

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Intraoperative OCT is an innovative and promising technology which allows anterior and posterior segment ocular surgeons to obtain a near-histologic cross-sectional and tomographic image of the tissues. Intraoperative OCT has several applications in ocular surgery which are particularly interesting in the context of corneal transplantation. Indeed, iOCT images provide a direct and meticulous visualization of the anatomy, which could guide surgical decisions. In particular, during both big-bubble and manual DALK, the visualization of the relationship between the corneal layers and instruments allows the surgeon to obtain a more desirable depth of the trephination, thus achieving more type 1 bubbles, better regularity of the plane, and a reduced risk of DM perforation. During EK procedures, iOCT supplies information about proper descemetorhexis, graft orientation, and interface quality in order to optimize the postoperative adhesion and reduce the need for re-bubbling. Finally, mushroom PK, a challenging technique for many surgeons, can be aided through the use of iOCT since it guides the correct apposition of the lamellae and their centration. The technology of iOCT is still evolving: a larger field of view could allow for the visualization of all surgical fields, and automated tracking and iOCT autofocusing guarantee the continued centration of the image.

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Section: Guiding Mushroom Penetrating Keratoplastymentioning

confidence: 99%

Intraoperative OCT for Lamellar Corneal Surgery: A User Guide

Moramarco

Geronimo

Airaldi

et al. 2023

JCM

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show abstract

“…The finite element analysis investigating various edge shapes created during PK demonstrated that zig-zag shape had the highest ratios of stresses and minimal dioptric power value, suggesting the best wound healing and the best optical outcomes. [ 38 ]…”

Section: Femtosecond Laser-assisted Penetrating Keratoplastymentioning

confidence: 99%

Femtosecond laser-assisted corneal transplantation

Liu,

Mehta

2023

Taiwan J Ophthalmol

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Corneal transplantation is the only surgical option to improve symptoms and vision in patients with severe corneal opacification. With the evolution and development of keratoplasty techniques, corneal surgeons can perform customized keratoplasty, with complex graft–host junctions to promote wound healing and accelerate visual rehabilitation. Femtosecond laser (FSL) enable customization of the thickness and shape of the graft has been used for trephination of both donor and recipient corneas and for creating special wound configurations. In this review, we have summarized the intraoperative application and postoperative outcomes of FSL-assisted keratoplasties, including penetrating keratoplasty, anterior lamellar keratoplasty (ALK), deep ALK, Descemet stripping automated endothelial keratoplasty (EK), and Descemet membrane EK. Although FSL allows for the customization and precision in keratoplasty, several concerns, such as cost-effectiveness, limit its wider clinical adoption. Hence, more work is required to weigh the advantages and limitations of the FSL applications in corneal transplantation.

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“…The use of nonlinear models to simulate the skin, the muscles, and the tissues, is well-developed in the bio-mechanics context [11], [10], [27], [15] and [9] while the finite element method is a popular technique for the discretisation [23], [28], [18] using alternatively the weak formulation or the minimisation framework [3], [6], [24]. The Neo-hookean is considered as a well-adapted mechanical representation of the breast [22], [4] and more generally for human tissues [1], [14].…”

Section: Introductionmentioning

confidence: 99%

Parameters identification method for breast biomechanical numerical model

Lopes,

Clain,

Fernandes

2019

Preprint

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An accurate numerical model of the breast can help surgeons making better informed decisions by providing visual information of the final aspect of a breast after a surgery simulation. Surgery simulators can help surgeons decide which path to take during a surgery in order to increase its chance of success.Bio-mechanical breast simulations are based on a gravity free geometry as a reference domain and a nonlinear mechanical model characterised by physical coefficients. Most of the models proposed in literature are complex and use data from medical imaging to estimate said parameters. In some countries, the access to medical imaging devices is limited, hence, we propose a simple but yet realistic model that uses only a basic set of measurements easy to do in the context of routinely operations to obtain the bio-mechanical parameters of the breast.Both the mechanical system and the geometry are controlled with parameters we shall identify in an optimisation procedure. We give a detailed presentation of the model together with the optimisation method and the associated discretisation. Sensitivity analysis is then carried out to evaluate the robustness of the method.

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Biomechanical study on the edge shapes for penetrating keratoplasty

Cited by 11 publications

References 18 publications

Intraoperative OCT for Lamellar Corneal Surgery: A User Guide

Intraoperative OCT for Lamellar Corneal Surgery: A User Guide

Femtosecond laser-assisted corneal transplantation

Parameters identification method for breast biomechanical numerical model

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