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11 June 2002 Novel method for the in vivo detection of single leg separation failures in prosthetic heart valves
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Abstract
This paper presents a novel technique for the in vivo detection of single strut failures in Bjork-Shiley convexo-concave prosthetic heart valves. The method makes use of Lorentz forces to excite the resonant modes of the strut. The forces are generated by immersing the valve in a static magnetic field and inducing eddy currents in the valve using an auxiliary coil excited by a tone burst. The tone frequency is set at a value that is close to the resonant frequency of an Intact Outlet Strut. The state of the strut is assessed by measuring the acoustic field generated in response to the excitation, using a hydrophone placed on the chest of the patient. An intact outlet strut is indicated if the excitation is able to excite the resonant modes, which correspond to those of a healthy outlet strut. The paper describes work done in simulating the BSCC heart valve using finite element methods to estimate the modal frequencies. Simulation results together with experimental data supporting the predictions are presented. This work was supported by the Trustees of the Bowling-Pfizer Heart Valve Settlement Funds.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jie Long, Satish S. Udpa, and Yushi Sun "Novel method for the in vivo detection of single leg separation failures in prosthetic heart valves", Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002); https://doi.org/10.1117/12.469896
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