Αρχειοθήκη ιστολογίου

Τρίτη 25 Ιουνίου 2019

High-Resolution Measurements of Leakage Flow Inside the Hinge of a Large-scale Bileaflet Mechanical Heart Valve Hinge Model
Abstract Purpose It is believed that non-physiological leakage flow through hinge gaps during diastole contributes to thrombus formation in Bileaflet Mechanical Heart Valves (BMHVs). Because of the small scale and difficulty of experimental access, fluid dynamics inside the hinge cavity has not yet been characterised in detail. The objective is to investigate small-scale structure inside the hinge experimentally, and gain insight into...
Latest Results for Cardiovascular Engineering and Technology
15m
Automatic Segmentation, Detection, and Diagnosis of Abdominal Aortic Aneurysm (AAA) Using Convolutional Neural Networks and Hough Circles Algorithm
Abstract Purpose An abdominal aortic aneurysm (AAA) is known as a cardiovascular disease involving localized deformation (swelling or enlargement) of aorta occurring between the renal and iliac arteries. AAA would jeopardize patients' lives due to its rupturing risk, so prompt recognition and diagnosis of this disorder is vital. Although computed tomography angiography (CTA) is the preferred imaging modality used by radiologist for diagnosing...
Latest Results for Cardiovascular Engineering and Technology
15m
Optimization of a Transcatheter Heart Valve Frame Using Patient-Specific Computer Simulation
Abstract Purpose This study proposes a new framework to optimize the design of a transcatheter aortic valve through patient-specific finite element and fluid dynamics simulation. Methods Two geometrical parameters of the frame, the diameter at ventricular inflow and the height of the first row of cells, were examined using the central composite design. The...
Latest Results for Cardiovascular Engineering and Technology
15m
Preload Sensitivity with TORVAD Counterpulse Support Prevents Suction and Overpumping
Abstract Purpose This study compares preload sensitivity of continuous flow (CF) VAD support to counterpulsation using the Windmill toroidal VAD (TORVAD). The TORVAD is a two-piston rotary pump that ejects 30 mL in early diastole, which increases cardiac output while preserving aortic valve flow. Methods Preload sensitivity was compared for CF vs. TORVAD...
Latest Results for Cardiovascular Engineering and Technology
15m
Asymmetric Dynamics of the Native Aortic Annulus Evaluated by Force Transducer and Sonomicrometry in a Porcine Model
Abstract Purpose With new repair techniques of the aortic root and valve emerging, a detailed understanding of the dynamics of the aortic annulus and valve is required for optimal results. The objective of this study was to characterize geometrical changes and force distribution of the native porcine aortic annulus throughout the cardiac cycle. Methods Measurements...
Latest Results for Cardiovascular Engineering and Technology
15m
The Length Versus Diameter Relationship and Radial Force Properties of the Amplatzer™ Vascular Plug Type IV: Observations for Oversizing
Abstract Background In palliated single ventricle patients aortopulmonary collateralization is a cause for significant loss of cardiovascular efficiency. In larger vessels, device occlusion becomes an alternative to embolization with multiple coils. The physical characteristics of the Amplatzer ™ Vascular Plug Type IV (AVPIV) are potentially conducive to oversizing the device allowing coverage of a longer portion of vessel. Despite...
Latest Results for Cardiovascular Engineering and Technology
15m
A Tunable Resonance Cantilever for Cardiac Energy Harvesting
Abstract Purpose Energy harvesting from cardiac motion is an attractive means to avoid the use of batteries in implantable sensors and pacemakers. A single implantable device would ideally integrate both sensing and self-powering functionality. Methods This work describes a novel electromagnetic system that achieves high sensitivity detection...
Latest Results for Cardiovascular Engineering and Technology
15m
MRI and Blood Flow in Human Arteries: Are There Any Adverse Effects?
Abstract Purpose To explore if there are any adverse effects on blood flow in human beings when they are exposed to high or ultra high intensity magnetic fields in MRI, by investigating both qualitatively and quantitatively the effects of such fields on the velocity of blood and medically significant hemodynamic wall parameters such as wall shear stress (WSS), oscillatory shear index (OSI) and relative residence time (RRT) in four...
Latest Results for Cardiovascular Engineering and Technology
15m

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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00306932607174,00302841026182,alsfakia@gmail.com

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