Evaluation of materials for artificial heart valves
نویسندگان
چکیده
منابع مشابه
Artificial Heart Valves
The cardiovascular system is a closed circulatory system that ensures blood flow through the human body. Blood circulates through two systems; the first is responsible for pushing blood from the heart to the lungs to capture oxygen, and the second is responsible for distributing oxygenated blood to body organs. This system is composed of a double pump with branched tubes that leads blood from t...
متن کاملFluid mechanics of artificial heart valves.
1. Artificial heart valves have been in use for over five decades to replace diseased heart valves. Since the first heart valve replacement performed with a caged-ball valve, more than 50 valve designs have been developed, differing principally in valve geometry, number of leaflets and material. To date, all artificial heart valves are plagued with complications associated with haemolysis, coag...
متن کاملAcute failure of artificial heart valves.
acute myocardial infarctions has shown that 160 mg aspirin daily reduces mortality after five weeks by a fifth.9 Despite the lack of evidence from clinical trials many patients with transient ischaemic attack and stroke are treated with 75 mg daily (a dose enshrined in the current British National Formulary), with the risk that they may be receiving an inadequate dose, albeit a safe one. On the...
متن کاملComparative hydrodynamic evaluation of bioprosthetic heart valves.
BACKGROUND AND AIM OF STUDY Pressure gradients across cardiac valve prostheses have been identified as one of the most important performance measures in valve replacement surgery. Specifically in aortic valves, these gradients influence reduction of left ventricular hypertrophy and are postulated to influence long-term survival. The correct choice of replacement valve is hampered by a lack of u...
متن کاملCfd Simulation of Blood Flow through Artificial Heart Valves
Artificial valve replacement is a common procedure in case of heart valve disorders treatment. The main task of this prosthesis is to generate blood flow similar to flow generated by natural, human valve. Velocity distribution depends mainly on the geometry of the valve. That is why it should be analysed and modified in case to obtain the best results. The objective of this study was to numeric...
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ژورنال
عنوان ژورنال: Bulletin of Materials Science
سال: 1991
ISSN: 0250-4707,0973-7669
DOI: 10.1007/bf02823243