Impedance registration and catheter tracking

A - Human Necessities – 61 – B

Patent

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Details

A61B 5/06 (2006.01) A61B 6/12 (2006.01) A61B 8/08 (2006.01)

Patent

CA 2676590

Methods and systems are disclosed for determining information about a position of an object within a distribution of materials having different complex conductivities. The method includes: (i) causing current to flow in the distribution; (ii) measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; (iii) providing spatial information about the distribution of materials with respect to a first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; and (iv) determining the position of the object with respect to the spatial information about the distribution of materials based on measured electrical signals and the spatial information. In certain embodiments, the object is a catheter inserted into a patients heart cavity for cardiac mapping.

L'invention concerne des procédés et des systèmes destinés à déterminer des informations relatives à la position d'un objet dans une distribution de matériaux ayant différentes conductivités complexes. Le procédé comprend les étapes consistant à : (i) faire passer un courant dans la distribution ; (ii) mesurer un signal électrique au niveau d'emplacements multiples dans la distribution de matériaux en réponse au courant ; (iii) utiliser des informations spatiales relatives à la distribution de matériaux par rapport à un premier cadre de référence, les informations spatiales étant indicatrices des régions de différentes conductivités complexes dans la distribution de matériaux ; et (iv) déterminer la position de l'objet par rapport aux informations spatiales relatives à la distribution des matériaux fondées sur les signaux électriques mesurés et les informations spatiales. Selon certains modes de réalisation, l'objet est un cathéter inséré dans la cavité cardiaque d'un patient pour cartographie cardiaque.

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