MRI-SAFE HIGH IMPEDANCE LEAD SYSTEMS
First Claim
Patent Images
1. An MRI/RF compatible medical device, comprising:
- an implantable lead system elongate lead having at least a first and a second electrode, each associated with a respective first and second axially extending conductor, wherein a plurality of spaced apart capacitors are disposed between the first and second axially extending conductors along at least major portion of a length of the lead system to define a plurality of high impedance circuit segments, whereby the lead system has a high impedance at a target range of high radiofrequencies and a low impedance at low frequencies.
12 Assignments
0 Petitions
Accused Products
Abstract
Some embodiments are directed to MRI/RF compatible medical interventional devices. A plurality of spaced apart high impedance circuit segments are configured to have a high impedance at a high range of radiofrequencies and a low impedance at a low range of frequencies The high impedance circuit segments may comprise co-wound coiled inductors and can reduce, block or inhibit RJ-transmission along the lead system (20) during exposure to RF associated with a high-Held magnet MRI systems, while permuting passage of low frequency physiologic signals, treatments and/or stimuli The devices can include at least one electrode
208 Citations
45 Claims
-
1. An MRI/RF compatible medical device, comprising:
an implantable lead system elongate lead having at least a first and a second electrode, each associated with a respective first and second axially extending conductor, wherein a plurality of spaced apart capacitors are disposed between the first and second axially extending conductors along at least major portion of a length of the lead system to define a plurality of high impedance circuit segments, whereby the lead system has a high impedance at a target range of high radiofrequencies and a low impedance at low frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
22. An MRI compatible device/lead system, comprising:
-
an implantable lead system elongate lead having at least a first and a second electrode, each associated with a respective first and second axially extending conductor; and a high impedance surface band gap structure disposed about the first and second conductors. - View Dependent Claims (23)
-
-
24. An MRI compatible device comprising:
-
an implantable lead system elongate lead having at least a first and a second electrode, each associated with a respective first and second axially extending conductor, wherein a plurality of spaced apart capacitors are disposed between the first and second axially extending conductors along at least major portion of a length of the lead system to define a plurality of high impedance circuit segments; and a high impedance band gap surface formed along at least a major length of the lead system; wherein the lead system has a high impedance at a high range of radiofrequencies and a low impedance at a low range of frequencies.
-
-
25. An MRI compatible implantable pulse generator (IPG), comprising:
-
an implantable housing; a high impedance decoupling circuit disposed in the housing; at least one implantable lead in communication with the decoupling circuit and configured with a length that extends from the housing to a target treatment site; at least one implantable electrode in communication with the lead; and a controller in the implantable housing, the controller configured to selectively activate the decoupling circuit to provide a high impedance to the lead at high radiofrequencies and a low impedance at a low radiofrequencies. - View Dependent Claims (26)
-
-
27. An MRI safe lead system, comprising:
-
an elongate flexible body with a plurality of conductive leads, the body having distal and proximal portions, the conductive leads having a plurality of axially spaced apart coiled segments and a plurality of linear segments residing between adjacent coiled segments; at least one electrode in communication with the at least one conductive lead; and a plurality of high impedance segments axially spaced apart along a length of the conductive lead, the high impedance segments including; a coiled conductive lead segment defining an inductor; a dielectric over the coiled conductive lead segment; a conductive shield over the dielectric with the dielectric residing between the inductor and the conductive shield; and a plurality of capacitors at a first end portion of the coiled lead segment, a respective capacitor electrically connecting a respective conductive lead to the shield to define an RF short and low frequency open circuit, wherein the high impedance segments are tuned to a target RF frequency associated with an MRI system. - View Dependent Claims (28)
-
-
29. An MRI safe lead system, comprising:
-
an elongate flexible body with at least one conductive lead, the body having distal and proximal portions, the at least one conductive lead having a plurality of axially spaced apart coiled segments and a plurality of linear segments residing between adjacent coiled segments; at least one electrode in communication with the at least one conductive lead; and a plurality of high impedance segments axially spaced apart along a length of the lead, the high impedance segments including; a coiled conductive lead segment defining an inductor; a dielectric over the coiled conductive lead segment; a conductive shield over the dielectric with the dielectric residing between the inductor and the conductive shield, wherein the at least one conductive lead is electrically coupled to the shield at a first end portion of the coiled segment; and a capacitor at an opposing second end portion of the coiled conductive lead segment electrically connecting the at least one conductor and the shield to define an RF short and low frequency open circuit, wherein the high impedance segments are tuned to a target RF frequency associated with an MRI system. - View Dependent Claims (30, 31)
-
-
32. An MRI safe lead system, comprising:
-
an elongate flexible body with a plurality of conductive leads, the conductive leads each having a plurality of axially spaced apart coiled segments defining an inductor; at least one electrode residing at a distal portion of the flexible body in communication with at least one of the conductive leads; and a plurality of high impedance segments axially spaced apart along a length of the flexible body, the high impedance segments each having a length with opposing proximal and distal end portions, the high impedance segments including; a plurality of coiled conductive lead segments residing at a common axially extending segment of the flexible body, at least one coiled conductive lead segment for each of the leads; a dielectric insulator covering the plurality of coiled conductive lead segments at the common axial segment; a conductive shield at the common axial segment disposed over the dielectric insulator with the dielectric insulator residing between the coiled conductive lead segments and the conductive shield, wherein a single one of the plurality of conductive leads is electrically coupled to the conductive shield at one of the end portions of the high impedance segment proximate the common axial segment, and wherein the high impedance segments are tuned to at least one MRI operating frequency. - View Dependent Claims (33, 34, 35)
-
-
36. An MRI safe lead system, comprising:
-
an elongate flexible body with a plurality of conductive leads and at least one high impedance segment with opposing proximal and distal portions, wherein the at least one high impedance segment is configured so that; at least one of the conductive leads has (a) a first individually coiled segment that is proximate to but axially apart from the coiled segments of the other conductive leads, and (b) a second coiled segment that is co-wound with at least one of coiled segment of another conductive lead; a conductive shield residing over the first and second coiled conductive lead segments; and an insulating material residing between the shield and the first and second coiled conductive lead segments, wherein the at least one conductive lead with the individual and co-wound coiled conductive lead segments is in electrical communication with the shield at a first end portion of the high impedance segment, and wherein the high impedance segments are tuned to at least one MRI operating frequency. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
-
Specification