Articles Related to Pulsatile Flow Simulation

C Settanni, T Becker, A Ducruet, W Merritt, A Huckleberry - Journal of NeuroInterventional Surgery (JNIS) Volume 11, Issue Suppl 1

Although current microcatheter technologies have advanced in recent years, corresponding endovascular devices still lag behind... ...This research project includes development of innovative in vitro aneurysm vessel model with complex side branching.... … communicating (ACA) bifurcation. Flow is regulated through the use of a Super Pump AR (ViVitro Labs). This 3D printed model will be implemented in an in vitro flow model that enables systemic data collection. A data acquisition … ...The in vitro model is used to simulate and quantify short-and long-term viability of new biomaterials for brain aneurysm embolization...

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Fergal B. Coulter, Manuel Schaffner, Jakob A. Faber, Ahmad Rafsanjani, Robin Smith, Harish Appa, Peter Zilla, Deon Bezuidenhout, and Andre´ R. Studart - Matter, 2019

Synthetic implants made by traditional fabrication routes are not patient specific and rarely match the performance of their biological counterparts. We present an additive manufacturing approach for the digital fabrication of tissue-like aortic heart valves featuring customizable geometry and leaflet architectures that resemble those of native valve tissue... ...Flow was driven by a forward pressure of 100 mmHg imposed across the valve using a pulsatile testing machine (PD2010; ViVitro, Victoria, BC, Canada)... ...The ability to fabricate synthetic implants with tailored designs at multiple length scales is a key contribution toward the digital fabrication of functional implants that perform on par with native body parts...

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Diya Wang; Boris Chayer ; François Destrempes ; François Toumoux ; Guy Cloutier - 2018 IEEE International Ultrasonics Symposium (IUS) 20 December 2018

Aortic stiffness is altered by cardiovascular diseases and exacerbated in innate or pathological conditions, which might be detected by noninvasive vascular elastography.... ...results suggest that the proposed model could detect and evaluate aortic aneurysm stiffness and may be useful clinically for the early and timely detection of degraded mechanical properties to impact patient outcomes.... … Hz. Normal and aneurysm aortic deformations were compared by pulsing mimicing vessels at 60 bpm, using a hydraulic pulse duplicator within a left ventricular model (Superpump system, Vivitro Inc., Victoria, BC, Canada) …

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Brandon J. Tefft, Joshua A. Choe, Melissa D. Young, Ryan S. Hennessy, David W. Morse, Jeffery A. Bouchard, Herbert J. Hedberg, Joseph F. Consiglio, Dan Dragomir-Daescu, Robert D. Simari, Amir Lerman

Tissue engineered heart valves (TEHV) are being investigated to address the limitations of currently available valve prostheses... ...A bioreactor system was designed based on the Windkessel approach. Novel features including a purpose-built valve chamber and pressure feedback control were incorporated to maintain asepsis while achieving a range of hydrodynamic conditions.... … The bioreactor was used to assess the hydrodynamic performance of a bioprosthesis and the results were compared to those obtained with a ViVitro Pulse Duplicator system (ViVitro Labs, Victoria, BC, Canada)... ...The bioreactor system was able to produce a range of pressure and flow conditions from static to resting adult left ventricular outflow tract to pathological including hypertension...

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Hongliang Li, Jonathan Porée, Marie-Hélène, Roy Cardinal, Guy Cloutier - Ultrasonics Available online 21 July 2018, In Press

Polar strain (radial and circumferential) estimations can suffer from artifacts because the center of a nonsymmetrical carotid atherosclerotic artery, defining the coordinate system in cross-sectional view, can be misregistered... ...Two-affine model-based estimators for vascular ultrasound elastography in cross-sectional view of the artery are evaluated in a common framework of high-frame-rate imaging... ...This paper presents two affine model-based estimators, the affine phase-based estimator (APBE) developed in the framework of transverse oscillation (TO) beamforming, and the Lagrangian speckle model estimator (LSME)...

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Marije E. Kamphuis; Gert Jan Pelgrim; Marcel J. W. Greuter; Riemer H. J. A. Slart; Cornelis H. Slump Proceedings Volume 10577, Medical Imaging 2018: Image Perception, Observer Performance, and Technology Assessment; 1057714 (2018); doi: 10.1117/12.2286337 Event: SPIE Medical Imaging, 2018, Houston, Texas, United States

...Myocardial perfusion imaging (MPI) is a commonly used diagnostic method in coronary artery disease (CAD)... ... In line with proper clinical decision-making, it is essential to assess institutional MPI test validity by confronting MBF assessment to a ground truth. Our research focuses on developing such validation instrument/method for MPI by means of simulating controlled myocardial perfusion in a phantom flow setup.... … All the data presented in this paper were obtained with the open circuit setup to prevent contrast recirculation. The used piston pump (Vivitro Superpump, Vivitro Labs, Victoria, Canada) generates programmable pulsatile flow

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Ram Ghosh, Gil Marom, Oren Rotman, Marvin J. Slepian, Saurabh Prabhakar, Marc Horner and Danny Bluestein -- Journal of Biomechanical Engineering doi:10.1115/1.4040600 History: Received November 06, 2017; Revised May 30, 2018

...All currently FDA-approved TAVR devices use tissue valves that were adapted to but not specifically designed for TAVR use. Emerging clinical evidence indicates that these valves may get damaged during crimping and deployment- leading to valvular calcification, thrombotic complications, and limited durability... ...Our research group has developed a novel polymeric prosthetic valve, which was optimized to reduce stresses on the leaflets, improve hemodynamics and has thrombogenic performance similar to that of a tissue valve... … The valves are then sutured to a nitinol stent for completion of the process. The valves' durability is now being assessed using a Vivitro Hi-Cycle System (Vivitro Labs, Inc … Hydrodynamic performance is being evaluated using the Vivitro left heart simulator (Vivitro Labs, Inc …

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A. Desai, T. Vafaee, P. Rooney, J.N. Kearney, H.E. Berry, E. Ingham, J. Fisher, L.M. Jennings Journal of the Mechanical Behavior of Biomedical Materials 14 September 2017

The use of decellularised biological heart valves in the replacement of damaged heart valves ... ...The purpose of this study was to assess the effect of low concentration sodium dodecyl sulphate decellularisation on the in vitro biomechanical and hydrodynamic properties of cryopreserved human aortic and pulmonary roots.... ... performance of the valve roots. A viscoelastic impedance adapter (VIA; Vivitro System Inc., Victoria BC, Canada) was used to deliver a more physiological ventricle pressure and flow waveform in the simulator. This system allowed for ...

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Guangyu Zhu; Masakazu Nakao; Qi Yuan and Joon Hock Yeo Proceedings of the 10th International Joint Conference on Biomedical Engineering Systems and Technologies - Volume 1: BIODEVICES, 186-189, 2017, Porto, Portugal

Truly stentless polymeric valve prosthesis can be a viable alternative for aortic valve replacement (AVR). In the present paper, the dynamic and hemodynamic performance of a novel designed expanded-polytetrafluoroethylene (ePTFE) stentless tri-leaflet valve was assessed experimentally.... ... The in-vitro tests were performed under time-varying physiological pressure by using the Vivitro pulse duplicator. ... The Vivitro pulse duplicator (Vivitro Systems Inc., Victoria, BC, Canada) was used to generate the physiological pressure and flow in the left ventricle and aorta. ...

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Lim, Brian. Muhammad Mujahid. Tan, Rong Wang. Arunkumar, U. Singapore Polytechnic School of Mechanical and Aeronautical Engineering

Coronary heart disease (CHD) is a common cardiac disorder in which a portion of the coronary artery is blocked, leading to a potential heart attack. Timely and accurate evaluation of suspected CHD patients is critical. Computer Tomography Angiography (CTA)... In order to streamline the evaluation of suspected CHD patients, we propose to create a more accurate and consistent diagnostic method of interpreting CTA results.

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Ahmad Falahatpisheha, Daisuke Morisawaa, Taraz T. Tooskyb, Arash Kheradvara Journal of Biomechanics Available online 16 November 2016

...developed a novel polymeric valve whose leaflets possess calcium hydroxyapatite inclusions immersed in them. This study reports the characteristics and feasibility of these valves. ... The system is connected and actuated by a pulsatile pump system (Superpump system, VSI, SPS3891, Vivitro systems Inc., Victoria, BC, Canada), which operates based on a VSI Wave Generator VG2001 (Vivitro Systems Inc., Victoria, BC, Canada) and controlled by a ...

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Onur Dur, Keif Fitzgerald, Paul Muller, Chris Parker Thoratec Corporation, Sunnyvale, CA company slide

The HeartMate PHP is a 13F catheter-based trans-aortic heart pump with a collapsible distal portion that expands to 24F to provide minimally invasive acute hemodynamic stabilization and left ventricular unloading in both prophylactic and emergent clinical settings... Objective: To evaluate the interaction of the HeartMate PHP with native cardiovascular system via in vitro pulsatile mock flow loop testing. A custom-built pulsatile heart simulator adapted from Vivitro Pulse Duplicator (Vivitro Labs Inc., Canada) was tuned to generate physiological flow pressure waveforms while mimicking the preload sensitivity of the native heart.

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Cole Feagler, Zeeshan Syedain and Robert Tranquillo University of Minnesota College of Science and Engineering Poster Report

While most commercial valves today use chemically-fixed porcine tissue in the construction of the replacement valves, the Tranquillo group has been exploring the use of decellularized, engineered tissue as leaflet material... ...The goal of this project was to engineer a commissure design to mitigate valve failure through tissue tearing, and to improve overall valve hemodynamics. (I.e. reduction of PVL)... ...Prototype TEHVs were tested to failure using a ViVitro Labs pulse duplicator, running custom LabView data acquisition software...

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Sean Guo-Dong Tan, Sangho Kim, Hwa Liang Leo Experiments in Fluids June 2016, 57:110

Mechanical heart valve prostheses are often implanted in young patients due to their durability and long-term reliability. However, existing designs are known to induce elevated levels of blood damage and blood platelet activation... ...This study proposes a bi-leaflet mechanical heart valve design (Bio-MHV) that mimics the geometry of a human mitral valve, with the aim of reducing turbulence levels in the left ventricle by replicating physiological flow patterns... ... A pulsatile pump (ViVitro Labs Inc., Victoria, BC) attached to the working chamber drove the blood analog around the flow loop, via the pumping action of the silicon left ventricle, as shown in Fig. 1c. Fig. 2 a A mitral flow waveform sample observed in the experiments. ...

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Koohyar Vahidkhah, Dan Cordasco, Mostafa Abbasi, Liang Ge, Elaine Tseng, Prosenjit Bagchi, Ali N. Azadani Annals of Biomedical Engineering pp 1-13 First online: 05 April 2016

Valvular hemolysis and thrombosis are common complications associated with stenotic heart valves. This study aims to determine the extent to which hemodynamics induce such traumatic events. The viscous shear stress downstream of a severely calcified bioprosthetic valve was evaluated via in vitro 2D particle image velocimetry measurements. ... Calcification was present on all the leaflets with a very small tear, less than 0.5 mm, on one of the leaflets (Figs. 1a, 1b). The bioprosthesis was tested at room temperature in a custom-built pulse duplicator system (ViVitro Systems, Inc., Victoria, Canada). ...

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Nandini Duraiswamy , Jason D. Weaver, Yasamin Ekrami, Stephen M. Retta, Changfu Wu Cardiovascular Engineering and Technology pp 1-13 First online: 10 February 2016

... The hydrodynamic testing was per- formed using 0.9% saline solution in the commercially available Left Heart Simulator (Vivitro Systems), which simulates function of the heart by generating pulsatile flow through prosthetic heart valves. ...In the EllipMinor and EllipMajor configurations, the maximum principal stress occurred near the center of the free edge of the “stretched” leaflets. These results further affirm recommendations by the International Standards Organization (ISO) that pre-clinical testing should consider non-circular configurations for transcatheter valve durability testing.

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Ikechukwu Okafor, Arvind Santhanakrishnan, Vrishank Raghav, Ajit Yoganathan- Journal of Biomechanical Engineering 10/2015;

...The results support the hypothesis that a D-shaped mitral annulus reduces dissipative energy losses in ventricular filling during diastole, and in turn suggests that a symmetric stent design does not provide lower filling efficiency than an equivalent asymmetric design. ...fluctuations were imposed in a fluid-filled chamber housing the LV physical model using a programmable piston pump (Superpump, Vivitro Systems; British Columbia, Canada). The pressure fluctuations resulted in the deformation of the LV model, driving flow through ...

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Zeeshan Syedaina, Jay Reimera, Jillian Schmidta, Matthew Lahtic, James Berryc, Richard Biancoc, Robert T. Tranquillo - doi:10.1016/j.biomaterials.2015.09.016

Diseased aortic valves often require replacement, with over 30% of the current aortic valve surgeries performed in patients who will outlive a bioprosthetic valve. While many promising tissue-engineered valves have been created in the lab using the cell-seeded polymeric scaffold paradigm, none have been successfully tested long-term in the aortic position of pre-clinical model. ... A customized pulse duplicator system was designed based on a commercial wave generator and pump (ViVitro Systems). ...

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Andrea Salicaa, Giuseppe Pisanib, Umberto Morbiduccib, Raffaele Scaffaa, Diana Massaib, Alberto Audeninob, Luca Welterta, Lorenzo Guerrieri Wolfa and Ruggero De Paulisa - - European Journal of Cardio- Thoracic Surgery (2015), First published online: September 10, 2015

Normal aortic valve opening and closing movement is a complex mechanism mainly regulated by the blood flow characteristics and the cyclic modifications of the aortic root. Our previous in vitro observations demonstrated that the presence of the Valsalva sinuses, independently from root compliance, is important in reducing systolic pressure drop across the aortic valve. ... The hydrodynamic performances under pulsatile flow regimen were investigated, using a Vivitro System, Inc. ... Direct visualization of valve operating condition was performed, using an ultrafast speed camera (Casio Exlim Ex F1), mounted on top of the Vivitro system [19, 20]. ...

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Filippo Piatti, Francesco Sturla, Gil Marom, Jawaad Sheriff, Thomas E. Claiborne, Marvin J. Slepian, Alberto Redaelli, Danny Bluestein - Journal of Biomechanics, 2015 Published Online: August 21, 2015

... The aim of this study was to characterize the hemodynamics and thrombogenic potential of the Polynova polymeric trileaflet valve prototype using a fluid-structure interaction (FSI) approach. The FSI model replicated experimental conditions of the valve as tested in a ViVitro Left Heart Simulator (ViVitro Labs Inc., Victoria, BC, Canada). ... FSI data, ViVitro data. Cardiac output (L/min), 5.62, 5.50. ...

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