Stomach stress and strain depend on location, direction and the layered structure

Zhao, Jingbo; Liao, Donghua; Chen, Pengmin; Kunwald, Peter

doi:10.1016/j.jbiomech.2008.09.008

Cited by 59 publications

(33 citation statements)

References 26 publications

(22 reference statements)

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“…The pre-compression B-mode ultrasound images were used to evaluate the thickness of each layer and were determined to be 2.36±0.31 mm, 0.74±0.10 mm and 2.97±0.19 mm for the muscularis, submucosa and mucosal layers, respectively. Similar morphometric results were obtained by Zhao et al [29] who reported the thickness of the muscularis and the combined mucosa-submucosa as 4mm and 3 mm (3.71 mm in our case), respectively for pigs weighing 100kg. Jia et al [28] also reported similar results for the serosa-muscle (~2.9 mm) layer and combined mucosa-submucosa (~2.9 mm) layer for pigs weighing 140kg.…”

Section: Resultssupporting

confidence: 91%

“…This has allowed a variety of ex vivo studies to be performed on stomach [28], [29] and esophagus [30]–[34] where the layers are tested separately. While these tests allow each individual layer to be tested in their no-load states, the degree of tissue damage imparted in surgical separation is unknown and fails to acknowledge the impact of layer-layer bonding on the overall tissue behavior.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Mechanical Characterization of Multilayer Soft Tissue Using Ultrasound Imaging

Dargar

Akyildiz

2017

IEEE Trans. Biomed. Eng.

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In this paper we report the development of a technique to characterize layer-specific nonlinear material properties of soft tissue in situ with the potential for in vivo testing. A Soft Tissue Elastography Robotic Ann (STiERA) system comprising of a robotically manipulated 30 MHz high-resolution ultrasound probe, a custom designed compression head and load cells has been developed to perform compression ultrasound imaging on the target tissue and measure reaction forces. A multi-layer finite element model is iteratively optimized to identify the material coefficients of each layer. Validation has been performed using tissue mimicking agar-based phantoms with a low relative error of ~7% for two--layer phantoms and ~10% error for three layer phantoms when compared to known ground-truth values obtained using a commercial material testing system. The technique has then been used to successfully determine the in situ layer-specific mechanical properties of intact porcine stomach. The mean C10 and C20 for a second order reduced polynomial material model were determined for the muscularis (6.41±0.60, 4.29±1.87 kPa), submucosal (5.21±0.57, 3.68±3.01 kPa) and mucosal layers (0.06±0.02, 0.09±0.24 kPa). Such a system can be utilized to perform in vivo mechanical characterization, which is left as future work.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

In Situ Mechanical Characterization of Multilayer Soft Tissue Using Ultrasound Imaging

Dargar

Akyildiz

2017

IEEE Trans. Biomed. Eng.

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“…The isochoric contribution can be modelled as an incompressible material, and here and after we mean only the isochoric contribution when we talk about lung tissue. So-called "hollow" organs such as stomach and bowel and soft biological tissues containing large fibres such as skin, arterial walls, tendons, ligaments, etc., are not considered in this review because of their anisotropy and inhomogeneity [16,42,124]. Models, describing anisotropic behaviour of such biological materials could be found in [36,37,[41][42][43]49].…”

Section: Introductionmentioning

confidence: 99%

Isotropic incompressible hyperelastic models for modelling the mechanical behaviour of biological tissues: a review

Wex

Arndt

Stoll

et al. 2015

Biomedical Engineering / Biomedizinische Technik

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Modelling the mechanical behaviour of biological tissues is of vital importance for clinical applications. It is necessary for surgery simulation, tissue engineering, finite element modelling of soft tissues, etc. The theory of linear elasticity is frequently used to characterise biological tissues; however, the theory of nonlinear elasticity using hyperelastic models, describes accurately the nonlinear tissue response under large strains. The aim of this study is to provide a review of constitutive equations based on the continuum mechanics approach for modelling the rate-independent mechanical behaviour of homogeneous, isotropic and incompressible biological materials. The hyperelastic approach postulates an existence of the strain energy function--a scalar function per unit reference volume, which relates the displacement of the tissue to their corresponding stress values. The most popular form of the strain energy functions as Neo-Hookean, Mooney-Rivlin, Ogden, Yeoh, Fung-Demiray, Veronda-Westmann, Arruda-Boyce, Gent and their modifications are described and discussed considering their ability to analytically characterise the mechanical behaviour of biological tissues. The review provides a complete and detailed analysis of the strain energy functions used for modelling the rate-independent mechanical behaviour of soft biological tissues such as liver, kidney, spleen, brain, breast, etc.

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“…Knowledge of the quantitative relationship among regional gastric geometry, local deformation and intragastric pressure is important for better understanding of gastric accommodation and gastric perception (Azpiroz, 1998;Distrutti et al, 1999;Moragas et al, 1993). Most knowledge on muscle mechanics in vitro in the stomach comes from the uniaxial stress-strain relationships (Yamada, 1970;Zhao et al, 2005Zhao et al, , 2008. However, the stomach with its complex geometry in vivo experiences physiological loading with a complex deformation pattern, e.g.…”

Section: Introductionmentioning

confidence: 99%

A novel 3D shape context method based strain analysis on a rat stomach model

Liao

Zhao

Gregersen³

2012

Journal of Biomechanics

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Stomach stress and strain depend on location, direction and the layered structure

Cited by 59 publications

References 26 publications

In Situ Mechanical Characterization of Multilayer Soft Tissue Using Ultrasound Imaging

In Situ Mechanical Characterization of Multilayer Soft Tissue Using Ultrasound Imaging

Isotropic incompressible hyperelastic models for modelling the mechanical behaviour of biological tissues: a review

A novel 3D shape context method based strain analysis on a rat stomach model

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