Recurrent Stent-Graft Disintegration Caused by Cardiac-Induced Aortoiliac Movements

Keulen, Jasper W. van; Prehn, Joffrey van; Moll, Frans L.; Herwaarden, Joost A. van

doi:10.1583/10-3058.1

Cited by 2 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their values were 0.08 mm with Sylgard 160 and 0.34 mm with Sylgard 170, when considering changes of maximum diameter between 80 and 120 mm Hg. The cyclic motions observed in this study are in better agreement with expected motions at the maximum diameter and to motions overall of most untreated AAA studies (motions of ~ 1.0mm) as is summarized by van Keulen et al [15], though they are less than those reported in Fades et al [44], which showed a mean motion of 3.51 mm prior to endograft treatment. The motions observed (summarized in Table 2) are also in line with what is expected from the observations of Long et al [16] of Ep with the interquartile range of 2.6 X 10"^ Pa to 4.3 x lO' Pa, with a median of 3.4 x lO' Pa.…”

Section: Discussionsupporting

confidence: 90%

See 1 more Smart Citation

Stereoscopically Observed Deformations of a Compliant Abdominal Aortic Aneurysm Model

Meyer

Bertrand

Boiron

et al. 2011

Journal of Biomechanical Engineering

View full text Add to dashboard Cite

A new experimental setup has been implemented to precisely measure the deformations of an entire model abdominal aortic aneurysm (AAA). This setup addresses a gap between the computational and experimental models of AAA that have aimed at improving the limited understanding of aneurysm development and rupture. The experimental validation of the deformations from computational approaches has been limited by a lack of consideration of the large and varied deformations that AAAs undergo in response to physiologic flow and pressure. To address the issue of experimentally validating these calculated deformations, a stereoscopic imaging system utilizing two cameras was constructed to measure model aneurysm displacement in response to pressurization. The three model shapes, consisting of a healthy aorta, an AAA with bifurcation, and an AAA without bifurcation, were also evaluated with computational solid mechanical modeling using finite elements to assess the impact of differences between material properties and for comparison against the experimental inflations. The device demonstrated adequate accuracy (surface points were located to within 0.07 mm) for capturing local variation while allowing the full length of the aneurysm sac to be observed at once. The experimental model AAA demonstrated realistic aneurysm behavior by having cyclic strains consistent with reported clinical observations between pressures 80 and 120 mm Hg. These strains are 1-2%, and the local spatial variations in experimental strain were less than predicted by the computational models. The three different models demonstrated that the asymmetric bifurcation creates displacement differences but not cyclic strain differences within the aneurysm sac. The technique and device captured regional variations of strain that are unobservable with diameter measures alone. It also allowed the calculation of local strain and removed rigid body motion effects on the strain calculation. The results of the computations show that an asymmetric aortic bifurcation created displacement differences but not cyclic strain differences within the aneurysm sac.

show abstract

Section: Discussionsupporting

confidence: 90%

“…which have been summarized by van Keulen et al [15]. Clinical measurements of deformation such as Ep (also called Peterson's or pressure-.strain modulus) also have shown promise in rupture prediction [16].…”

Section: Introductionmentioning

confidence: 99%