News Column

Patent Application Titled "Multi- Array Monophasic Potential Medical Device" Published Online

July 3, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors WERNETH, Randell L. (San Diego, CA); HOCINI, Meleze (Pessac, FR); STEWART, Mark T. (Lino Lakes, MN); WITTENBERGER, Dan (L'ile Bizard, CA); CORVI, Timothy J. (Carlsbad, CA); LAU, Michael T. (Fremont, CA); SHARMA, Vinod (Maple Grove, MN), filed on February 18, 2014, was made available online on June 19, 2014.

The assignee for this patent application is Medtronic Ablation Frontiers LLC.

Reporters obtained the following quote from the background information supplied by the inventors: "Medical procedures are available for treatment of a variety of cardiovascular maladies, such as cardiac arrhythmias, atrial fibrillation, and other irregularities in the transmission of electrical impulses through the heart. As an alternative to open-heart surgery, many medical procedures are performed using minimally invasive surgical techniques, where one or more slender implements are inserted through one or more small incisions into a patient's body. Such procedures may involve the use of catheters or probes having multiple sensors, electrodes, or other measurement and treatment components to treat the diseased area of the heart, vasculature, or other tissue. Minimally-invasive devices are desirable for various medical and surgical applications because they allow for shorter patient recovery times compared to surgery, and for precise treatment of localized discrete tissues that are otherwise difficult to access. For example, catheters may be easily inserted and navigated through the blood vessels and arteries, allowing non-invasive access to areas of the body with relatively little trauma, while other minimally-invasive probes or instruments may be inserted into small openings and directed through targeted anatomy without significant impact or disruption to surrounding tissue.

"One such example of a minimally invasive therapy involves the treatment of cardiac arrhythmias or irregular heartbeats in which physicians employ specialized cardiac assessment and treatment devices, such as a mapping and/or ablation catheter, to gain access to interior regions of a patient's body. Such devices may include tip electrodes or other ablating elements to create lesions or other anatomical effects that disrupt or block electrical pathways through the targeted tissue. In the treatment of cardiac arrhythmias, a specific area of cardiac tissue having aberrant electrical activity (e.g. focal trigger, slow conduction, excessively rapid repolarization, fractionated electrogram, etc.) is typically identified first before subsequent treatment. This localization or identification can include obtaining monophasic action potential ('MAP') electrograms of a particular cardiac region. Monophasic action potentials reproduce complete action potential of cardiac tissues including the repolarization time course of myocardial cells with high accuracy and provide precise information on local activation. MAP signals may be obtained by temporarily depolarizing selected tissue, with responsive electrical activity being recorded or otherwise monitored for an indication of aberrant electrical activity. After mapping and diagnosing aberrant tissue, a physician may decide to treat the patient by ablating the tissue.

"Recording MAP signals and subsequently treating affected areas involve maneuvering selected diagnostic and treatment devices through restricted and sometimes tortuous pathways to access the desired tissue region. The restrictive environment surrounding the targeted tissue can reduce the ability of a device to be properly positioned to obtain the desired information and/or deliver the treatment needed. To provide more effective and efficient medical treatments, it is thus desirable to optimize the apparatus and method of use for the specific tissue to be treated, taking into account the characteristics of the tissue to be diagnosed and treated, as well as the location and pathway of access to the selected tissue."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "The present invention advantageously provides a medical device, system, and method for treating a patient by obtaining monophasic action potential ('MAP') electrograms of cardiac tissue, either epicardially or endocardially, for the identification and treatment of electrical tissue disorders. In particular, a medical device includes a shaft having a distal portion, a first monophasic action potential electrode array coupled to the distal portion, a second monophasic action potential electrode array coupled to a lateral surface of the shaft proximal to the first array, and an additional electrode coupled to the shaft.

"The second electrode array may be oriented substantially orthogonal to the first electrode array, and may include a plurality of electrodes positioned along a length of the shaft, the electrodes arranged in two rows approximately 180 degrees apart from one another. The shaft may be controllably deflectable within a defined plane, and the two rows of electrodes may be aligned in the plane. The first and second electrode arrays may include respective pluralities of substantially hemispherical shaped electrodes, which may be made of substantially non-polarizable material. The first electrode array may include a plurality of electrodes, four for example, that are equally spaced from a longitudinal axis defined by the shaft. The additional electrode may define a substantially cylindrical band circumscribing the shaft proximally of the second electrode array, a substantially semi-cylindrical band circumscribing approximately half of a circumference of the shaft, or a dome at the distal portion of the shaft, with the first electrode array circularly arranged around the dome. The additional electrode may be recessed at the distal portion of the shaft, substantially centered with respect to the first electrode array, and the device may also include a pacing electrode or electrode pair coupled to the shaft. The second electrode array may define at least one port in fluid communication with a supply of electrically conductive fluid. The medical device may also include a sheath covering a portion of the second electrode array; the sheath having a side aperture exposing another portion of the second electrode array. The second electrode array may also be a retractable needle.

"A medical device is also provided, including a catheter having a shaft with a distal portion; a first plurality of substantially hemispherical electrodes coupled to the distal portion; a second plurality of substantially hemispherical electrodes coupled to the shaft proximal of the first plurality, where the second plurality of electrodes are oriented substantially orthogonal to the first plurality of electrodes; and an additional electrode coupled to the shaft. The device may also include a console having a processor in electrical communication with the first and second plurality of electrodes and the additional electrode, the processor programmed to obtaining a monophasic action potential recording from at least one of the first and second plurality of electrodes. The additional electrode may be recessed at the distal portion of the shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

"A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein:

"FIG. 1 is an illustration of an exemplary medical system constructed in accordance with the principles of the present invention;

"FIG. 2 is an illustration of an exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 3 is an illustration of another exemplary medical device constructed in accordance with the principles of the present invention;

"FIGS. 3A-3D are illustrations of additional exemplary medical devices constructed in accordance with the principles of the present invention;

"FIG. 4 is an illustration of another exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 5 is an illustration of yet another exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 6 is a side view of the medical device of FIG. 5;

"FIG. 7 is an illustration of an exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 8 is an illustration of another exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 9 is an illustration of an exemplary medical system constructed in accordance with the principles of the present invention;

"FIG. 10 is an illustration of a medical device constructed in accordance with the principles of the present invention;

"FIG. 11 is an illustration of another exemplary medical device constructed in accordance with the principles of the present invention;

"FIG. 12 is an illustration of exemplary deflection profiles of the medical device of FIG. 1;

"FIG. 13 is an illustration of additional exemplary deflection profiles of the medical device of FIG. 1;

"FIG. 14 is an illustration of an exemplary use of the medical device of FIG. 1; and

"FIGS. 15A-15C are illustrations of additional exemplary medical devices constructed in accordance with the principles of the present invention;"

For more information, see this patent application: WERNETH, Randell L.; HOCINI, Meleze; STEWART, Mark T.; WITTENBERGER, Dan; CORVI, Timothy J.; LAU, Michael T.; SHARMA, Vinod. Multi- Array Monophasic Potential Medical Device. Filed February 18, 2014 and posted June 19, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=1904&p=39&f=G&l=50&d=PG01&S1=20140612.PD.&OS=PD/20140612&RS=PD/20140612

Keywords for this news article include: Surgery, Cardiology, Cardio Device, Medical Devices, Cardiac Arrhythmias, Medtronic Ablation Frontiers LLC.

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Source: Politics & Government Week


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