The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2003
Filed:
Mar. 21, 2000
Raju R. Viswanathan, Towson, MD (US);
Image-Guided Drug Delivery Systems, Inc., Minneapolis, MN (US);
Abstract
Microcoil designs are provided that enable unique RF response Field profiles that are particularly useful in MRI imaging procedures, particularly where fields of view outside of the medical device are desirable. These devices are particulatly for use within an organism, the device comprising an element having at least one RF receiver, the coils of said microcoils defining a cross-section that lies in a plane oriented at 0 to 90 (or 0 to 80) degrees to the longest axis of the device. Another way of describing the device is as a device for use in an organism, the device comprising an element having at least one wound microcoil with at least three windings on the microcoil. Each winding has an aspect ratio of greater than one. The aspect ratio of each winding is measured as the ratio of longest to shortest dimension in a cross section situated approximately transverse to the winding axis of the coil windings, the winding axis also being transverse to the longest axis of said device. Another way of describing the device for use within an organism is as a device comprising an element having at least one RF receiver microcoil, the coils of the microcoils defining a cross-sectional contour having an alignment value of at least 0.75 with the longest axis of the device. The coil windings of the microcoil may have the cross-section comprise a geometric shape, such as a curvilinear shape, a polygon (regular or irregular), or a polygon where comers on the polygon are softened (e.g., slighly rounded). The device may comprise a catheter having at least one lumen. At least one microcoil should be located with its longest dimension defining a longitudinal spatial extent (direction) parallel to the at least one lumen and the coils having a conductor thickness of greater than 0.01 mm and less than 2.4 mm.