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"Systems and Methods for Sensing External Magnetic Fields in Implantable Medical Devices" in Patent Application Approval Process

July 31, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors Gauglitz, Karl (Snohomish, WA); Bocek, Thomas M. (Seattle, WA); Rutzer, Mark (Seattle, WA); Matthews, Lorin W. (Brier, WA); Reagor, William E. (Bellevue, WA); Erbstoeszer, Blair (Kirkland, WA), filed on March 11, 2014, was made available online on July 17, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application is assigned to Cardiac Pacemakers, Inc.

The following quote was obtained by the news editors from the background information supplied by the inventors: "Implantable medical devices (IMDs) include devices such as implantable defibrillators, cardioverters, neurostimulators, and pacemakers. Since the early 1980s, thousands of patients prone to irregular and sometimes life threatening heart rhythms have had IMDs implanted in their bodies, typically in the upper chest area above their hearts. Certain of these devices detect onset of abnormal heart rhythms and automatically apply corrective electrical therapy, specifically one or more bursts of electric energy, to hearts. When the bursts of electric current are of sufficient amplitude and are properly synchronized with the cardiac signal, they restore normal heart function without human intervention, sparing patients considerable discomfort and often saving their lives.

"With the increase in use of magnetic resonance imaging (MRI) as a diagnostic tool, patients with IMDs are exposed to strong magnetic fields on a more frequent basis."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "Disclosed herein, among other things, is an apparatus for sensing magnetic fields. An apparatus embodiment includes a sensing circuit with at least one inductor having a magnetic core that saturates in the presence of a magnetic field having a prescribed flux density. The apparatus embodiment also includes an impedance measuring circuit connected to the sensing circuit. The impedance measuring circuit is adapted to measure impedance of the sensing circuit and to provide a signal when the impedance changes by a prescribed amount.

"An apparatus embodiment includes means for sensing the presence of a magnetic field from a magnetic resonance imaging device. This apparatus embodiment also includes means for measuring impedance connected to the sensing means, including means for signaling when the measured impedance changes by a prescribed amount. The means for sensing includes a resistor-inductor-capacitor (RLC) circuit, according to various embodiments. According to an embodiment, the means for measuring includes a transthoracic impedance measurement module (TIMM).

"One aspect of this disclosure relates to an implantable medical device with magnetic field sensing capability. The device embodiment includes a sensing circuit with at least one inductor having a magnetic core that saturates in the presence of a magnetic field having a prescribed flux density. The device embodiment also includes an impedance measuring circuit connected to the sensing circuit. The impedance measuring circuit is adapted to measure the impedance of the sensing circuit and to provide a signal when the impedance changes by a prescribed amount. The device embodiment further includes a controller adapted to receive the signal and modify device behavior while in the presence of the magnetic field.

"One aspect of this disclosure relates to a method for sensing external magnetic fields. The method embodiment includes sensing a magnetic field using a circuit having an inductor with a magnetic core that saturates in the presence of a magnetic field having a prescribed flux density, measuring impedance of the circuit, and sending a signal to an implantable medical device when the measured impedance indicates the inductor is saturated.

"This Summary is an overview of some of the teachings of the present application and is not intended to be an exclusive or exhaustive treatment of the present subject matter. Further details are found in the detailed description and appended claims. Other aspects will be apparent to persons skilled in the art upon reading and understanding the following detailed description and viewing the drawings that form a part thereof, each of which is not to be taken in a limiting sense. The scope of the present invention is defined by the appended claims and their legal equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 illustrates a block diagram of a system for sensing magnetic fields, according to one embodiment.

"FIG. 2 illustrates a schematic diagram of a system for sensing magnetic fields, according to one embodiment.

"FIG. 3 illustrates a graphical diagram of measured impedance in a system for sensing magnetic fields, according to one embodiment.

"FIG. 4 illustrates a block diagram of a system with an IMD including a system for sensing magnetic fields, according to one embodiment.

"FIG. 5 illustrates a block diagram of a programmer such as illustrated in the system of FIG. 4 or other external device to communicate with the IMD(s), according to one embodiment.

"FIG. 6 illustrates a flow diagram of a method for sensing external magnetic fields from an IMD, according to one embodiment.

"FIG. 7 illustrates a flow diagram of a method for making a magnetic field sensor, according to one embodiment."

URL and more information on this patent application, see: Gauglitz, Karl; Bocek, Thomas M.; Rutzer, Mark; Matthews, Lorin W.; Reagor, William E.; Erbstoeszer, Blair. Systems and Methods for Sensing External Magnetic Fields in Implantable Medical Devices. Filed March 11, 2014 and posted July 17, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=1458&p=30&f=G&l=50&d=PG01&S1=20140710.PD.&OS=PD/20140710&RS=PD/20140710

Keywords for this news article include: Cardiac Pacemakers, Cardiac Pacemakers Inc., Cardio Device, Cardiology, Medical Devices.

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Source: Politics & Government Week


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