Laboratory tests for strength paramaters of brain aneurysms

• Autorzy: Toth, B. K. , Nasztanovics, F. , Bojtar, I.
• Języki publikacji: EN

Abstrakty

EN

The presentation is focused on the analysis of biophysical properties of cerebral aneurysms, diagnosed and delineated in living human individuals. An aneurysm is a bulging out of a part of the wall of a blood vessel. The aim of our research was to delineate flow patterns inside the aneurysm and its parent artery, to estimate stresses at critical points of the aneurysm wall, to model the haemodynamic effect of different surgical and endovascular tools in order to define the optimal one in a particular case, and to estimate the likelihood of a later aneurysm rupture. For this reason we carried out a lot of different laboratory tests to analyse the mechanical parameters of the aneurysm wall. We made a comparative study of some material models reported in the literature to describe the mechanical response of arteries. These are models for incompressible materials. For this reason we perform uniaxial and biaxial measurements to have appropriate parameters for the models of underlying material.

Słowa kluczowe

PL

metoda elementów skończonych; lepkosprężystość

EN

arterial tissue; cerebral saccular aneurysm; material model; vascular biomechanical properties; viscoplasticity; flow and solid; finite element modelling

• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2007
• Tom: Vol. 9, no. 2
• Strony: 3-7
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Toth, B. K.

autor

Nasztanovics, F.

autor

Bojtar, I.

• Budapest University of Technology and Economics, Budapest,

Bibliografia

• [1] CHOUNG C.J., FUNG Y.C., Three-dimensional stress distribution in arteries, J. Biomech. Engr., 1983, 105, 268–274.
• [2] STEINMAN D.A., Image-based computational simulation of flow dynamics in a giant intracranial aneurysm, American J. of Neuroradiology, 2003, 24, 559–566.
• [3] VORP D.A., RAJAGOPAL K.R., SMOLINSKY P.J., BOROVETZ H.S., Identification of elastic properties of homogeneous orthotropic vascular segments in distension, J. Biomech., 1995, 28, 501–512.
• [4] HOLZAPFEL G.A., Nonlinear Continuum Mechanics. Hyperelastic Materials, 2002.
• [5] O’ROURKE F., Vascular mechanics in the clinic, J. of Biomechanics, 2003, 36, 623–630.
• [6] OROSZ M., MOLNÁRKA G., NÁDASY G.L., RAFFAI G., KOZMANN G., MONOS E., Validity of viscoelastic models of vessel wall, 64th An. Meeting of the Hung. Physiol. Soc., Budapest, 1997.
• [7] TÓTH M., NÁDASY GY.L., NYÁRY I., KERÉNYI T., OROSZ M., MOLNÁRKA GY., MONOS E., Sterically inhomogeneous viscoelastic behavior of human saccular cerebral aneurysms, Érbetegségek, 1997, IV/2, J. Vasc. Res., 1998, 35, 345–355.