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- Title
Variation of Passive Biomechanical Properties of the Small Intestine along Its Length: Microstructure-Based Characterization.
- Authors
Sokolis, Dimitrios P.
- Abstract
Multiaxial testing of the small intestinal wall is critical for understanding its biomechanical properties and defining material models, but limited data and material models are available. The aim of the present study was to develop a microstructure-based material model for the small intestine and test whether there was a significant variation in the passive biomechanical properties along the length of the organ. Rat tissue was cut into eight segments that underwent inflation/extension testing, and their nonlinearly hyper-elastic and anisotropic response was characterized by a fiberreinforced model. Extensive parametric analysis showed a non-significant contribution to the model of the isotropic matrix and circumferential-fiber family, leading also to severe over-parameterization. Such issues were not apparent with the reduced neo-Hookean and (axial and diagonal)-fiber family model, that provided equally accurate fitting results. Absence from the model of either the axial or diagonal-fiber families led to ill representations of the force- and pressure-diameter data, respectively. The primary direction of anisotropy, designated by the estimated orientation angle of diagonalfiber families, was about 35°C to the axial direction, corroborating prior microscopic observations of submucosal collagen-fiber orientation. The estimated model parameters varied across and within the duodenum, jejunum, and ileum, corroborating histologically assessed segmental differences in layer thicknesses.
- Subjects
INTESTINES; SMALL intestine; DUODENUM; JEJUNUM; ILEUM; MECHANICAL properties of condensed matter
- Publication
Bioengineering (Basel), 2021, Vol 8, Issue 3, p1
- ISSN
2306-5354
- Publication type
Article
- DOI
10.3390/bioengineering8030032