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1. WO1997049334 - FERROMAGNETIC FOREIGN BODY SCREENING METHOD AND APPARATUS

Publication Number WO/1997/049334
Publication Date 31.12.1997
International Application No. PCT/US1997/010892
International Filing Date 24.06.1997
Chapter 2 Demand Filed 22.01.1998
IPC
A61B 5/04 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
04Measuring bioelectric signals of the body or parts thereof
A61B 5/05 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
05Measuring for diagnosis by means of electric currents or magnetic fields
G01R 33/16 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
12Measuring magnetic properties of articles or specimens of solids or fluids
16Measuring susceptibility
G01V 3/08 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
08operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
CPC
A61B 5/04005
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
04Measuring bioelectric signals of the body or parts thereof
04005Detecting magnetic fields produced by bio-electric currents
A61B 5/05
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; ; Measuring using microwaves or radiowaves
A61B 5/055
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; ; Measuring using microwaves or radiowaves
055involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
A61B 5/416
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
41Detecting, measuring or recording for evaluating the immune or lymphatic systems
414Evaluating particular organs or parts of the immune or lymphatic systems
416the spleen
A61B 5/4244
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
42Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems
4222Evaluating particular parts, e.g. particular organs
4244liver
G01R 33/16
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
12Measuring magnetic properties of articles or specimens of solids or fluids
16Measuring susceptibility
Applicants
  • QUANTUM MAGNETICS, INC. [US]/[US]
  • PROTON SCIENCES CORPORATION [US]/[US]
Inventors
  • AVRIN, William, F.
  • CZIPOTT, Peter, V.
  • MASSENGILL, R., Kemp
Agents
  • SPINKS, Gerald, W.
Priority Data
08/670,39325.06.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FERROMAGNETIC FOREIGN BODY SCREENING METHOD AND APPARATUS
(FR) METHODE ET APPAREIL DESTINES AU DEPISTAGE D'UN CORPS ETRANGER FERROMAGNETIQUE
Abstract
(EN)
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.
(FR)
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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