Method and apparatus for eddy current compensation in a...

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01) A61B 5/07 (2006.01)

Patent

CA 2610379

Systems and methods are provided for determining a characteristic of an associated in vivo sensor within a living body. A transmit coil produces an excitation signal, having a first orientation, to excite the in vivo sensor to produce a response signal. A receive coil produces a current in response to the response signal. The receive coil is oriented to interact with signals having a second orientation that is substantially orthogonal to first orientation. The probe further comprises at least one eddy current compensation coil that produces a compensation field. A component of the compensation field along the second orientation has a magnitude at the receive coil substantially equal and opposite to a magnitude of a similarly oriented component of a magnetic field associated with eddy currents induced within the body.

L'invention porte sur des systèmes et sur des procédés visant à déterminer une caractéristique d'un capteur in vivo associé placé à l'intérieur du corps humain. Une bobine de transmission génère un signal d'excitation, ayant une première orientation, pour exciter le capteur in vivo afin de générer un signal de réponse. Une bobine de réception génère un courant en réaction au signal de réponse. La bobine de réception est orientée de façon à avoir une interaction avec des signaux ayant une seconde orientation sensiblement orthogonale à la première. La sonde comprend également au moins une bobine de compensation de courants de Foucault qui génère un champ de compensation. Une composante du champ de compensation le long de la seconde orientation a une grandeur, au niveau de la bobine de réception, sensiblement égale et opposée à une grandeur d'une composante d'orientation similaire d'un champ magnétique associé aux courants de Foucault induits dans le corps humain.

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