A shell finite element model of the pelvic floor muscles

d'Aulignac, D.; Martins, J. A. C.; Pires, E. B.; Mascarenhas, Teresa; Jorge, R.M. Natal

doi:10.1080/10255840500405378

Cited by 66 publications

(57 citation statements)

References 25 publications

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“…Martins presents a numerical model of this active behaviour of skeletal muscle, as well as the passive behaviour [28,88,89]. The passive behaviour of muscle tissue has the same properties of other biological soft tissues.…”

Section: Martins' Muscle Modelmentioning

confidence: 99%

“…Similar work on active muscle behaviour effects on other areas of the body have also been carried out. Some of these include cardiac muscle studies by Humphrey [63,64,65], and pelvic floor muscles by d'Aulignac and Martins [28,88,89]. An attempt to improve understanding of snoring using FE models has also been done using geometry captured from MRI data [79].…”

Section: Soft Tissue and Fe Modelsmentioning

confidence: 99%

“…The principal stretches (or eigenvalues) λ i , can be obtained from the spectral decompositions of C 28) and from B by…”

Section: An Overview Of Continuum Mechanicsmentioning

confidence: 99%

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The biomechanics of the human tongue

Kajee

Pelteret

Reddy

2013

Numer Methods Biomed Eng

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AcknowledgementsI would like express my gratitude to the following people for their assistance, leading to the successful completion of this work:The invaluable guidance provided by Prof. B. D. Reddy was integral to completing this project.It was an honour and a privilege to have worked with someone with such vast experience, knowledge and wisdom. Throughout my time at Cerecam, he has shown great patience and understanding.Dr. Andrew T. McBride assisted in times of difficulty, even during the most demanding times of his own PhD studies. His generosity, kindness, and outstanding work ethics have been an inspiration.Jean-Paul Pelteret is the person I worked with the most during this project. Without his invaluable assistance, this project could be likened to a Sisyphean task.It was an honour to have worked amongst such an esteemed group of academics at Cerecam. Many lunch hours and tea-breaks discussing everyday issues in a friendly atmosphere has proven fruitful. The geometry of the tongue, and each muscle group of the tongue, are visually identified, and its geometry captured using Mimics [100]. Various image processing tools available in Mimics, such as image segmentation, region-growing and volume generation were used to form the three-dimensional model of the tongue geometry. Muscle fibre orientations were extracted from the same dataset, also using Mimics.The muscle model presented here is based on Hill's three-element model for representation of the constituent parts of muscle fibres. This Hill-type muscle model also draws from recent work in muscle modelling, by Martins [88]. The model is implemented in an Abaqus user element (UEL) subroutine [24]. The transversely isotropic behaviour of the muscle tissue is accounted for, as well as the influence of muscle activation.The mechanics of the model is limited to static, small-strain, anisotropic, linear-elastic behaviour, and the governing equations are suitably linearized. The body position of the patient during an apneic episode is accounted for in the simulations, as well as the effect of gravity. The focus of this study is on tongue muscle behaviour under gravitational loading, simulating a simplified OSA event.Future models will incorporate airway pressure as well. The behaviour of the model is illustrated in a number of benchmark tests, and computational examples.iii

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Section: Martins' Muscle Modelmentioning

confidence: 99%

Section: Soft Tissue and Fe Modelsmentioning

confidence: 99%

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The biomechanics of the human tongue

Kajee

Pelteret

Reddy

2013

Numer Methods Biomed Eng

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“…As the diaphragm is very thin (3 -5 mm), the abovementioned 3D model is modified to agree with the thin shell theory (d'Aulignac et al 2005;Martins et al 2006Martins et al , 2007.…”

Section: Mpm Pato Et Al 508mentioning

confidence: 99%

“…In this work, a previously developed computational model (d'Aulignac et al 2005;Martins et al 2006Martins et al , 2007 for the passive and active contraction of skeletal muscles is considered with the objective of studying the behaviour of the diaphragm during the respiratory cycle in normal and pathological cases. In the next section, a geometrical model of the diaphragm is presented.…”

Section: Introductionmentioning

confidence: 99%

Finite element studies of the mechanical behaviour of the diaphragm in normal and pathological cases

Pato

Santos

Areias

et al. 2011

Computer Methods in Biomechanics and Biomedical Engineering

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Development of a computational biomechanical model of the human upper‐airway soft‐tissues toward simulating obstructive sleep apnea

Pelteret

Reddy

2013

Clinical Anatomy

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Numerous challenges are faced in investigations aimed at developing a better understanding of the pathophysiology of obstructive sleep apnea (OSA). The anatomy of the tongue and other upper-airway tissues, and the ability to model their behavior, are central to such investigations. We present details of the construction and development of a soft-tissue model of the human upper airway, with the ultimate goal of simulating obstructive sleep apnea. The steps taken to produce a representative anatomical geometry, of which the associated muscle histology is also captured, are documented. An overview of the mathematical models used to describe tissue behavior, both at a macro- and microscopic level, is given. A neurological model, which mimics the proprioceptive capabilities of the body, is described as it is applies to control of the active dynamics of the tongue. A simplified scenario, which allows for the manipulation of several environmental influences, is presented. It is demonstrated that the response of the genioglossus is qualitatively similar to that determined through experimental techniques. Furthermore, insights into the stress distribution developed within the tongue are discussed. It is shown that changes in almost any aspect of the breathing or physiological conditions invoke a significant change in the response of the airway dilators. The results of this study provide further evidence of the importance of modeling and simulation techniques as an aid in understanding the complex behavior of the human body.

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A shell finite element model of the pelvic floor muscles

Cited by 66 publications

References 25 publications

The biomechanics of the human tongue

The biomechanics of the human tongue

Finite element studies of the mechanical behaviour of the diaphragm in normal and pathological cases

Development of a computational biomechanical model of the human upper‐airway soft‐tissues toward simulating obstructive sleep apnea

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