Abstract
This paper discusses about minimally invasive techniques to detect the single leg fracture in special type of artificial heart valve called Bjork Shiley Convexo - Concave (BSCC). The fracture affects the outlet strut of these artificial heart valve and it is needed to detect it. For this purpose the electromagnetic methods based on eddy current testing were used. The coils are excited in the selected range of the frequencies for identification of the fractures in the outlet strut. The fractures occurring in BSCC heart valve and their numerical simulations are described. The results obtained with a prototype setup are presented and they demonstrate the usefulness of described techniques for detection of the outlet strut fractures in BSCC artificial heart valve.
Highlights
Dysfunction of the heart valves is a common complication after heart valve diseases
The opportunity to evaluate the state of the Bjork-Shiley Convexo Concave (BSCC) heart valve, a non-destructive test of each individual valve may help to detect the fractures presented in outlet strut and so precede the damage of the valve
The material object (BSCC heart valve) and the coil with given dimensions were used for numerical simulation of eddy current evaluation
Summary
Dysfunction of the heart valves is a common complication after heart valve diseases. When the symptoms become intolerable for a normal lifestyle, the normal course of action is to replace the damaged valve with an artificial one. BSCC heart valve has been used to replace the aortic or mitral valves and the design was developed in order to improve the hemodynamic and to reduce the risk of thromboembolism. The process of cyclic slamming open and shut of the occluder disc during heart function subjects the valve to percussive impact stress, which can cause fatigue failure These failures have been observed at the outlet strut flange junction near or at the weld. 83 COMMUNICATIONS 2 A / 2 0 1 1 G time between the first and the second fractures is highly variable Due to this fact there is a considerable interest, in development of methods for assessing the state of the valve in general condition of the outlet strut weld. To investigate the given problem, it is convenient to realize it with the aid of numerical simulation techniques
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