Mri compatible implant comprising electrically conductive...

A - Human Necessities – 61 – F

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A61F 2/06 (2006.01)

Patent

CA 2553178

The present invention relates to an implant 100 which comprises a plurality of electrically-conductive closed loops (300A, 300B, 300C, 300D; 120A, 120B, 120C, 120D each constituted from a plurality of loop portions such as struts (400, 500). The loops together form apertured walls of a cage with an interior volume, and the portions in any one said loop providing electrically- conductive pathways within which eddy currents are liable to be induced when the implant is subjected to an time-dependent external magnetic field, with each said loop comprising at least first and second said pathways. The implant is characterized in that the first and second pathways are arranged such that, in any particular magnetic field, the direction of the eddy current that would be induced in the second pathway is the reverse of the direction of the eddy current that would be induced in the first pathway, so as to mitigate the tendency of the implant to function in said magnetic field as a Faraday cage.

La présente invention concerne un implant (100) comprenant une pluralité de boucles fermées électro-conductrices (300A, 300B, 300C, 300D; 120A, 120B, 120C, 120D), chacune constituant une pluralité de parties boucles telles que des étrésillons (400, 500). Les boucles forment ensemble les parois à ouvertures d'une cage ayant un volume interne, et les parties dans une boucle quelconque fournissant des passages électro-conducteurs dans lesquels des courants de Foucault sont susceptibles d'être induits lorsque l'implant est soumis à un champ magnétique externe dépendant du temps, chaque boucle comprenant au moins un premier et un deuxième passage. L'implant est caractérisé en ce que le premier et le deuxième passage sont disposés de telle manière que, dans n'importe quel champ magnétique particulier, le courant de Foucault qui serait induit dans le deuxième passage, ait une direction opposée à celle du courant de Foucault qui serait induit dans le premier passage, de manière à limiter la tendance de l'implant à fonctionner comme une cage de Faraday dans ce champ magnétique.

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