Ferromagnetic foreign body screening method and apparatus

A - Human Necessities – 61 – B

Patent

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Details

A61B 5/05 (2006.01) A61B 5/04 (2006.01) G01R 33/16 (2006.01) G01V 3/08 (2006.01)

Patent

CA 2258268

A method and an apparatus are disclosed for applying a low strength, time varying magnetic field (26) to a selected screening region of a host, and for sensing a responsive magnetic field (28) from a retained ferrous body within the screening region. The excitation field coil is designed to create a region of finite magnetic field within the screening region, and a region of near zero magnetic field. The sensors (24) are placed within the region of near zero magnetic field to minimize the effect of the applied field. The effects of the applied field are further reduced by use of a reference sensor, field compensation coils, and a feedback loop. The magnetic gradient by the sensors (24) is processed to locate and characterize the ferrous body.

L'invention concerne une méthode et un appareil qui servent, d'une part, à appliquer à une région d'un hôte, choisie pour le dépistage, un champ magnétique (26) de faible intensité variable dans le temps et, d'autre part, à détecter un champ magnétique en réponse (28) provenant d'un corps ferreux retenu dans ladite région. La bobine d'excitation du champ est conçue de manière à créer à l'intérieur de la région en question une zone de champ magnétique délimité et une zone de champ magnétique proche du zéro. Afin de réduire au minimum les effets du champ magnétique appliqué, des capteurs (24) sont placés à l'intérieur de la zone du champ magnétique proche du zéro. On réduit davantage lesdits effets en utilisant un capteur de référence, des bobines de compensation de champ et une boucle d'asservissement. Afin de pouvoir situer et caractériser le corps ferreux, on procède au traitement du gradient magnétique près des capteurs (24).

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