Title
On the feasibility of detecting flaws in artificial heart valves
Author
Lepelaars, E.S.A.M.
Publication year
2000
Abstract
In this paper, we investigate the feasibility of detecting defects in certain artificial heart valves by determining the electromagnetic behavior of some simple models with the aid of thin-wire integral equations. The idea is to use the stationary current that occurs at late times after the excitation of a closed loop as a discriminator. This current exhibits an exponential decay when a resistive load is included that is representative of fatigue or a partial fracture. The decay rate is indicative of the severity of the defect. For a wire with an opening, which is representative of a complete fracture, the late-time current is completely absent. As a simplified model of remote detection by a small loop antenna that could be introduced via a catheter, we consider the coupling between two parallel circular wires. In all cases, the dispersive environment of the valve is taken to be homogeneous and filled with blood since this medium exhibits a representative dispersion. © 2000 IEEE.
Subject
ED - Electronic Defence
Physics & Electronics
Heart valves
Integral equations
Loop antennas
Nondestructive testing
Transient electromagnetics
Artificial organs
Blood
Catheters
Electric currents
Electromagnetic field effects
Failure analysis
Fatigue of materials
Fracture
Heart valve prostheses
Integral equations
Artificial heart valves
Exponential decay
Parallel circular wire
Partial fracture
Small loop antenna
Thin wire integral equations
Microwaves
To reference this document use:
http://resolver.tudelft.nl/uuid:4d654975-65d2-45f4-b28a-1cf4d7e030fd
TNO identifier
235756
ISSN
0018-9480
Source
IEEE Transactions on Microwave Theory and Techniques, 48 (1 PART 2), 2165-2171
Bibliographical note
Correspondence Address: Lepelaars, E.S.A.M.; TNO Physics and Electronics Laboratory, 2509 JG, The Hague, Netherlands
Document type
article