Ferrite core non-linearity in coils for magnetic neurostimulation

Healthcare Technology Letters

article

Anil Kumar RamRakhyani¹  Gianluca Lazzi¹ 

[1] Department of Electrical and Computer Engineering, University of Utah

关键词: ferrites;    neurophysiology;    biomagnetism;    bioelectric potentials;    finite difference methods;    coils;    patient treatment;    ferrite core nonlinearity;    coils;    magnetic neurostimulation;    peripheral neural system;    capacitive discharge;    transient voltage curve;    finite-difference model;    current-controlled inductance;    time-domain voltage waveforms;    Fe3O4;   

DOI  :  10.1049/htl.2014.0087

学科分类：肠胃与肝脏病学

来源: Wiley

【 摘 要 】

The need to correctly predict the voltage across terminals of mm-sized coils, with ferrite core, to be employed for magnetic stimulation of the peripheral neural system is the motivation for this work. In such applications, which rely on a capacitive discharge on the coil to realise a transient voltage curve of duration and strength suitable for neural stimulation, the correct modelling of the non-linearity of the ferrite core is critical. A demonstration of how a finite-difference model of the considered coils, which include a model of the current-controlled inductance in the coil, can be used to correctly predict the time-domain voltage waveforms across the terminals of a test coil is presented. Five coils of different dimensions, loaded with ferrite cores, have been fabricated and tested: the measured magnitude and width of the induced pulse are within 10% of simulated values.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND