Structure of blood flow through a curved vessel with an aneurysm

Niimi, Hideyuki; Kawano, Yasunobu; Sugiyama, Ikuo

doi:10.3233/bir-1984-21418

Cited by 32 publications

(15 citation statements)

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“…In addition to the effects investigated in the present study, flow in aneurysms is known to depend on the geometrical configuration of the aneurysm in relation to the parent vessel or bifurcation, the size of the orifice and the volume of the aneurysm 1, 7,17,18,20,27,30,36,37 For lateral aneurysms, intra-aneurysmal flow velocities are roughly proportional to the area of the orifice and inversely proportional to the square of the maximum fundus diameter 1, 13, 33. The slightly slower flow velocities in the centre of our elastic model were due to the slightly larger diameter of the fundus relative to the size of the orifice.…”

Section: Discussionmentioning

confidence: 81%

Haemodynamic stress in lateral saccular aneurysms

et al. 1987

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The flow velocities in lateral glass and silastic aneurysm models were quantitatively measured with the non-invasive laser Doppler method. The influences of the elasticity of the wall, the pulse wave and the properties of the perfusion medium on the intra-aneurysmal circulation were investigated. As shown previously, the inflow into the aneurysm arose from the downstream lip and was directed toward the centre of the fundus. Backflow to the parent vessel took place along the walls of the fundus. With non-pulsatile perfusion, flow velocities in the centre of the standardized aneurysms varied between 0.4 and 2% of the maximum velocity in the parent vessel. With pulsatile perfusion, flow velocities in the centre of the fundus ranged between 8 and 13% of the flow velocity in the axis of the parent vessel. Flow velocities in the aneurysms were slower with a macromolecular perfusion medium with blood like properties compared to a glycerol/water solution. Flow velocity measurements near the aneurysmal wall allowed the estimation of the shear stresses at critical locations. The maximum shear stresses at the downstream lip of the aneurysm were in the range of the stresses measured at the flow divider of an arterial bifurcation. The present results suggest that in human saccular aneurysms intra-aneurysmal flow and shear stress on the wall are directly related to the pulsatility of perfusion, i.e. the systolic/diastolic pressure difference and that the tendency to spontaneous thrombosis depends on the viscoelastic properties of the blood, namely the haematocrit.

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Section: Discussionmentioning

confidence: 81%

Haemodynamic stress in lateral saccular aneurysms

et al. 1987

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“…1. Niimi et al (1984) concluded that the curved arteries with an aneurysm at the outer wall (g ¼ 0 , Fig. 1) are at higher risk than at the inner wall (g ¼ 180 , Fig.…”

Section: Introductionmentioning

confidence: 98%

“…They showed that the main inflow into the fundus is at the downstream lip of the orifice, and a maximum wall shear stress (WSS) occurs near the distal lip of the orifice. Flow structures in the aneurysm models arising from a curved parent vessel were experimentally measured by Niimi et al (1984) and Liou and Liao (1997a, b) using LDV. The aneurysms examined are in the same plane as the parent vessel, i.e., g ¼ 0 or 180 in Fig.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental studies on pulsatile flow in aneurysms arising laterally from a curved parent vessel at various angles

Liou

Juan

2007

Journal of Biomechanics

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“…By means of an experimental investigation, Nimmi et al [22] established that the vortices induced in the aneurysm influence and modify the axial velocity and secondary flow due to the vessel curvature. McDonald [23] obtained theoretical results for catheter positioned coaxially and eccentrically in an artery with elliptical cross-section.…”

Section: Introductionmentioning

confidence: 99%

Particulate suspension blood flow through a narrow catheterized artery

Srivastava¹,

Srivastava²

2009

Computers & Mathematics with Applications

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a b s t r a c tThe problem of blood flow in a narrow catheterized artery has been investigated using a two-phase macroscopic model of blood (i.e., a suspension of red cells in plasma). It is found that the effective viscosity and the frictional resistance increase with hematocrit. Flow characteristics assume lower magnitudes in catheterized artery as compared to uncatheterized artery for any given set of parameters. Numerical results reveal that the effective viscosity and the increased frictional resistance assume their minimal magnitude and consequently the volumetric flow rate assumes its maximal magnitude during the artery catheterization at the catheter size approximately fifty percent of the artery size.

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Structure of blood flow through a curved vessel with an aneurysm

Cited by 32 publications

References 0 publications

Haemodynamic stress in lateral saccular aneurysms

Haemodynamic stress in lateral saccular aneurysms

Numerical and experimental studies on pulsatile flow in aneurysms arising laterally from a curved parent vessel at various angles

Particulate suspension blood flow through a narrow catheterized artery

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