Mri compatible implanted electronic medical device

A - Human Necessities – 61 – N

Patent

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Details

A61N 1/16 (2006.01) A61N 1/37 (2006.01) G01R 33/422 (2006.01)

Patent

CA 2628212

An implantable electronic medical device is compatible with a magnetic resonance imaging (MRI) scanner. The device has a housing with exterior walls, each formed by a dielectric substrate with electrically conductive layers on interior and exterior surfaces. A series of slots divide each layer into segments. Segmenting the layers provides high impedance to eddy currents produced by fields of the MRI scanner, while capacitive coupling of the segments provides radio frequency shielding for components inside the housing. Electrical leads extending from the housing have a pair of coaxially arranged conductors and traps that attenuate currents induced in the conductors by the fields of the MRI scanner.

L'invention concerne un dispositif médical électronique implantable compatible avec un scanner d'imagerie par résonance magnétique (IRM). Ce dispositif comporte un boîtier présentant des parois extérieures, chacune formées par un substrat diélectrique présentant des couches électroconductrices sur des surfaces intérieures et extérieures. Une série de rainures divise chaque couche en segments. La segmentation des couches fournit une haute impédance à des courants de Foucault produits par des champs du scanner IRM, tandis que le couplage capacitif des segments fournit un blindage RF pour des composants situés dans le boîtier. Des fils électriques s'étendant du boîtier présentent une paire de conducteurs disposés coaxialement et des pièges qui atténuent des courants induits dans les conducteurs par les champs du scanner IRM.

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