An Improved Methodology for Investigating the Parameters Influencing Migration Resistance of Abdominal Aortic Stent-Grafts

Corbett, Timothy J.; Callanan, Anthony; O'Donnell, Michael R.; McGloughlin, Timothy M.

doi:10.1583/09-2920.1

Cited by 12 publications

(7 citation statements)

References 50 publications

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“…So far, only a handful of studies have tried to assess the fixation of various EVAR devices, mainly in DF tolerance in human cadaveric, 11,14,16,17 in vivo ovine, 1,2 and cadaveric ovine 20 aortas, or in silicone models. 21 This is the first analysis to include the Aorfix and Aptus devices.…”

Section: Discussionmentioning

confidence: 99%

Helical EndoStaples enhance endograft fixation in an experimental model using human cadaveric aortas

Melas

Perdikides

Saratzis

et al. 2012

Journal of Vascular Surgery

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The fixation of eight different endografts was increased by a mean of 30 N with four Aptus EndoStaples and by a mean of 57 N with six EndoStaples in this model. Endostaples can increase endograft fixation to levels equivalent or superior to that of a hand-sewn anastomosis. The application of six EndoStaples results in aortic tissue failure above the fixation zone, demonstrating fixation strength that exceeds inherent aortic integrity in these cadavers.

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Section: Discussionmentioning

confidence: 99%

Helical EndoStaples enhance endograft fixation in an experimental model using human cadaveric aortas

Melas

Perdikides

Saratzis

et al. 2012

Journal of Vascular Surgery

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“…As discussed in Corbett et al [ 14 ] and shown in Additional file 1 : Table S4, silicone rubbers are good for AAA physical modelling due to high transparency and flexibility but struggle with barbed and hooked stent graft placement simulation due to low tear resistance.…”

Section: Methodsmentioning

confidence: 99%

“…Physical models of aneurysms (both abdominal aortic and cerebral) have been manufactured for a variety of scientific purposes; inclusion in experimental flow systems to study flow patterns and pressures [ 11 , 12 ] for validation of rupture site prediction made using finite element analysis [ 13 ], for laboratory investigations of migration of stent grafts [ 14 ], and in experimental systems for simulation of interventional procedures [ 9 , 10 , 15 ]. Manufacturing techniques may be broadly divided between casting techniques and 3D printing.…”

Section: Introductionmentioning

confidence: 99%

On the optimization of low-cost FDM 3D printers for accurate replication of patient-specific abdominal aortic aneurysm geometry

et al. 2018

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BackgroundThere is a potential for direct model manufacturing of abdominal aortic aneurysm (AAA) using 3D printing technique for generating flexible semi-transparent prototypes. A patient-specific AAA model was manufactured using fused deposition modelling (FDM) 3D printing technology. A flexible, semi-transparent thermoplastic polyurethane (TPU), called Cheetah Water (produced by Ninjatek, USA), was used as the flexible, transparent material for model manufacture with a hydrophilic support structure 3D printed with polyvinyl alcohol (PVA). Printing parameters were investigated to evaluate their effect on 3D–printing precision and transparency of the final model. ISO standard tear resistance tests were carried out on Ninjatek Cheetah specimens for a comparison of tear strength with silicone rubbers.ResultsIt was found that an increase in printing speed decreased printing accuracy, whilst using an infill percentage of 100% and printing nozzle temperature of 255 °C produced the most transparent results. The model had fair transparency, allowing external inspection of model inserts such as stent grafts, and good flexibility with an overall discrepancy between CAD and physical model average wall thicknesses of 0.05 mm (2.5% thicker than the CAD model). The tear resistance test found Ninjatek Cheetah TPU to have an average tear resistance of 83 kN/m, higher than any of the silicone rubbers used in previous AAA model manufacture. The model had lower cost (4.50 GBP per model), shorter manufacturing time (25 h 3 min) and an acceptable level of accuracy (2.61% error) compared to other methods.ConclusionsIt was concluded that the model would be of use in endovascular aneurysm repair planning and education, particularly for practicing placement of hooked or barbed stents, due to the model’s balance of flexibility, transparency, robustness and cost-effectiveness.Electronic supplementary materialThe online version of this article (10.1186/s41205-017-0023-2) contains supplementary material, which is available to authorized users.

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“…The representative 3D AAA model has been widely used in previous publications (Doyle et al 2009;Corbett et al 2010Corbett et al , 2011 and is based on average sizes taken from the Eurostar Data Registry System 2001, as shown in Figure 1(A) with a bifurcation angle u of 608. The photoelastic model has been previously described by Morris et al (2004).…”

Section: Photoelastic Model Creationmentioning

confidence: 99%

Finite element and photoelastic modelling of an abdominal aortic aneurysm: a comparative study

Callanan

Morris

McGloughlin

2012

Computer Methods in Biomechanics and Biomedical Engineering

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Rupture prediction of abdominal aortic aneurysms (AAAs) remains a clinical challenge. Finite element analysis (FEA) may allow for improved identification for intervention timing, but the method needs further substantiation. In this study, experimental photoelastic method and finite element techniques were compared using an idealised AAA geometry. There was good agreement between the numerical and experimental results. At the proximal and distal end of the AAA model, the maximum differences in principle strain for an internal pressure of 120 mmHg had differences ranging from 0.03 to 10.01%. The maximum difference in principle strain for the photoelastic and the finite element model at a pressure of 120 mmHg was 0.167 and 0.158, respectively. The current research strengthens the case for using FEA as an adjunct to the current clinical practice of utilising diameter measurement for intervention timing.

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An Improved Methodology for Investigating the Parameters Influencing Migration Resistance of Abdominal Aortic Stent-Grafts

Cited by 12 publications

References 50 publications

Helical EndoStaples enhance endograft fixation in an experimental model using human cadaveric aortas

Helical EndoStaples enhance endograft fixation in an experimental model using human cadaveric aortas

On the optimization of low-cost FDM 3D printers for accurate replication of patient-specific abdominal aortic aneurysm geometry

Finite element and photoelastic modelling of an abdominal aortic aneurysm: a comparative study

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