| US 7,467,005 B2 | ||
| Method and apparatus for non-invasively measuring blood flow and for acquiring and processing an ECG signal | ||
| Johann-Jakob Schmid, Rifferswil (Switzerland); Jacques Felblinger, Ludres (France); and Roger Abächerli, Baar (Switzerland) | ||
| Assigned to Schiller AG, Baar (Switzerland) | ||
| Filed on Nov. 10, 2003, as Appl. No. 10/703,524. | ||
| Claims priority of application No. 02405969 (EP), filed on Nov. 11, 2002. | ||
| Prior Publication US 2004/0097818 A1, May 20, 2004 | ||
| Int. Cl. A61B 5/05 (2006.01) | ||
| U.S. Cl. 600—419 | 6 Claims |
| 1. A non-invasive method for acquiring and processing an electro-physiological ECG signal from a patient who is exposed to
an extraneous magnetic field which produces interference in said ECG signal, said method comprising steps of:
recording a signal by measuring potential differences between at least two points on a person's body surface near a blood
vessel, the signal being an ECG signal overlaid with a magnetic interference component,
determining a portion of said ECG signal curve in which the signal is overlaid with a signal component produced on the basis
of the Hall effect on charge carriers in the blood flowing in the vessel, and subsequently
processing the signal curve and eliminating the component of the signal which is brought about by the Hall effect in said
portion of the signal curve.
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