Modeling stent deployment in realistic arterial segment geometries: The effect of the plaque composition

Karanasiou, Georgia S.; Sakellarios, Antonis I.; Tripoliti, Evanthia E.; Petrakis, Euripides G. M.; Zervakis, Michalis; Migliavacca, Francesco; Dubini, Gabriele; Dordoni, Elena; Michalis, Lambros K.; Fotiadis, Dimitrios I.

doi:10.1109/bibe.2013.6701537

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…The polyurethane balloon is described by a Mooney-Rivlin hyperelastic material model using C 10 =1.0318 MPa and C 01 =3.6927 MPa (23). Furthermore, balloon thickness is considered as 0.5 mm.…”

Section: Mechanical Characteristicsmentioning

confidence: 99%

Design and finite element analysis of a novel smart clamper for aortic cross-clamping in minimally invasive surgery

Farkoush

Abolfathi

Mehmanesh³

et al. 2015

Minimally Invasive Therapy & Allied Technologies

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Aortic cross-clamping is a critical action during heart surgeries which may cause some injuries to the wall of the artery. These injuries may have both short-term and long-term adverse effects on the artery function. Appropriate clampers can properly occlude the artery and decrease the extent of injury. Thus, developing a model for evaluation of such clampers is inevitable. In this paper, a finite element model of the aorta is presented; then, different mechanisms of clamping are investigated. In this regard, a numerical model of aortic cross-clamping by three types of clampers has been implemented with consideration of nonlinear behavior of two-layer artery, residual stress in aorta, and calcification. These three clamper models are commercial Chitwood clamper and linear mechanism clamper with and without balloon. Using the obtained results, comparative analysis was performed between the proposed clamper design and the commercial one. Based upon the analysis, it was concluded that the designed clamper, linear mechanism clamper with balloon, helps to distribute the stress uniformly in different layers of the aorta, which results in better performance of the clamping procedure and causes less injury in the aorta, especially when there is calcification.

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Section: Mechanical Characteristicsmentioning

confidence: 99%

Design and finite element analysis of a novel smart clamper for aortic cross-clamping in minimally invasive surgery

Farkoush

Abolfathi

Mehmanesh³

et al. 2015

Minimally Invasive Therapy & Allied Technologies

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show abstract

“…Dillon et al (2017) worked on an intraocular lens with a revised technique for iris suture [ 30 ]. Abdollahi et al (2017) worked on a cochlear implant for kids [ 31 ]. Ramesh et al (2017) worked on metal stents for the heart [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Sinusoidal Microchannel with Descending Curves for Varicose Veins Implantation

et al. 2018

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Approximately 26% of adult people, mostly females, are affected by varicose veins in old age. It is a common reason for distress, loss of efficiency, and worsening living conditions. Several traditional treatment techniques (sclerotherapy and foam sclerotherapy of large veins, laser surgeries and radiofrequency ablation, vein ligation and stripping, ambulatory phlebectomy, and endoscopic vein surgery) have failed to handle this disease effectively. Herein, authors have presented an alternative varicose vein implant method—the descending sinusoidal microchannel (DSMC). DSMC was simulated by Fuzzy logic MATLAB (The MathWorks, Natick, MA, USA) and ANSYS (ANSYS 18.2, perpetual license purchased by Ibadat Education Trust, The University of Lahore, Pakistan) with real and actual conditions. After simulations of DSMC, fabrication and testing were performed. The silver DSMC was manufactured by utilizing a micromachining procedure. The length, width, and depth of the silver substrate were 51 mm, 25 mm, and 1.1 mm, respectively. The measurements of the DSMC channel in the silver wafer substrate were 0.9 mm in width and 0.9 mm in depth. The three descending curves of the DSMC were 7 mm, 6 mm, and 5 mm in height. For pressure, actual conditions were carefully taken as 1.0 kPa to 1.5 kPa for varicose veins. For velocity, actual conditions were carefully taken as 0.02 m/s to 0.07 m/s for these veins. These are real and standard values used in simulations and experiments. At Reynolds number 323, the flow rate and velocity were determined as 1001.0 (0.1 nL/s), 11.4 cm/s and 1015.3 (0.1 nL/s), 12.19 cm/s by MATLAB (The MathWorks, Natick, MA, USA) and ANSYS simulations, respectively. The flow rate and velocity were determined to be 995.3 (0.1 nL/s) and 12.2 cm/s, respectively, at the same Reynolds number (323) in the experiment. Moreover, the Dean number was also calculated to observe Dean vortices. All simulated and experimental results were in close agreement. Consequently, DSMC can be implanted in varicose veins as a new treatment to preserve excellent blood flow in human legs from the original place to avoid tissue damage and other problems.

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