Multilayer helical wave filter for medical therapeutic or diagnostic applications
First Claim
1. A resonant multilayer helical wave filter, comprising:
- a) an electrical conductor, comprising;
i) a first helically wound inductor segment of the electrical conductor, wherein the first inductor segment is characterized as having been formed from the electrical conductor comprising at least one first planar surface having been wound along a first length from a proximal end of the first inductor segment to a spaced apart distal end thereof;
ii) a second helically wound inductor segment of the electrical conductor, wherein the second inductor segment is characterized as having been formed from the electrical conductor comprising at least one second planar surface having been wound along a second length from a distal end of the second inductor segment to a spaced apart proximal end thereof; and
iii) a return segment of the electrical conductor electrically and physically connecting from the distal end of the first helically wound inductor segment to the proximal end of the second helically wound inductor segment;
b) a dielectric material contacting at least the first and second helically wound inductor segments and the return segment,c) wherein the first and second helically wound inductor segments are wound in the same longitudinal direction and the first and second planar surfaces are substantially aligned facing each other in either a co-axial or co-radial relationship along their respective first and second lengths to thereby provide a bandstop filter inductance and a bandstop filter capacitance comprising a parasitic capacitance formed between the first and second planar surfaces that is sufficient to attenuate a first MRI RF pulsed frequency at or near a first RF resonant center frequency or range of frequencies.
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Accused Products
Abstract
A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.
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Citations
31 Claims
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1. A resonant multilayer helical wave filter, comprising:
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a) an electrical conductor, comprising; i) a first helically wound inductor segment of the electrical conductor, wherein the first inductor segment is characterized as having been formed from the electrical conductor comprising at least one first planar surface having been wound along a first length from a proximal end of the first inductor segment to a spaced apart distal end thereof; ii) a second helically wound inductor segment of the electrical conductor, wherein the second inductor segment is characterized as having been formed from the electrical conductor comprising at least one second planar surface having been wound along a second length from a distal end of the second inductor segment to a spaced apart proximal end thereof; and iii) a return segment of the electrical conductor electrically and physically connecting from the distal end of the first helically wound inductor segment to the proximal end of the second helically wound inductor segment; b) a dielectric material contacting at least the first and second helically wound inductor segments and the return segment, c) wherein the first and second helically wound inductor segments are wound in the same longitudinal direction and the first and second planar surfaces are substantially aligned facing each other in either a co-axial or co-radial relationship along their respective first and second lengths to thereby provide a bandstop filter inductance and a bandstop filter capacitance comprising a parasitic capacitance formed between the first and second planar surfaces that is sufficient to attenuate a first MRI RF pulsed frequency at or near a first RF resonant center frequency or range of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A resonant multilayer helical wave filter, comprising:
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a) an electrical conductor, comprising; i) a first helically wound inductor segment characterized as having been formed from the electrical conductor comprising at least one first planar surface having been wound from a first node to a spaced apart second node of the first inductor segment; ii) a second helically wound inductor segment characterized as having been formed from the electrical conductor comprising at least one second planar surface having been wound from a third node to a spaced apart fourth node of the second inductor segment; and iii) a return segment of the electrical conductor electrically and physically connecting from the second node of the first helically wound inductor segment to the third node of the second helically wound inductor segment; and b) a dielectric material contacting at least the first and second helically wound inductor segments and the return segment of the electrical conductor, c) wherein the first and second helically wound inductor segments are wound in the same longitudinal direction along a common length defined between the first and second nodes and between the third and fourth nodes so that the first and second planar surfaces are substantially aligned facing each other in either a co-axial or co-radial relationship along the common length to thereby provide a bandstop filter inductance and a bandstop filter capacitance comprising a parasitic capacitance formed between the first and second facing planar surfaces that is sufficient to attenuate a first MRI RF pulsed frequency at or near a first RF resonant center frequency or range of frequencies. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A resonant multiconductor and multilayer helical wave filter, comprising:
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a) a first electrical conductor, comprising; i) a first helically wound inductor segment characterized as having been formed from the first electrical conductor comprising at least one first planar surface having been wound from a first node to a spaced apart second node of the first inductor segment; ii) a second helically wound inductor segment characterized as having been formed from the first electrical conductor comprising at least one second planar surface having been wound from a third node to a spaced apart fourth node of the second inductor segment; and iii) a first return segment of the first electrical conductor electrically and physically connecting from the second node of the first helically wound inductor segment to the third node of the second helically wound inductor segment; b) a first dielectric material contacting at least the first and second helically wound inductor segments and the return segment, c) wherein the first and second helically wound inductor segments are wound in the same longitudinal direction along a first common length defined between the first and second nodes and between the third and fourth nodes with the first and second planar surfaces being substantially aligned facing each other in either a co-axial or co-radial relationship along their respective first and second helical winds; and d) a second electrical conductor, comprising; i) a third helically wound inductor segment characterized as having been formed from the second electrical conductor comprising at least one third planar surface having been wound from a fifth node to a sixth node of the third inductor segment; ii) a fourth helically wound inductor segment characterized as having been formed from the second electrical conductor comprising at least one fourth planar surface having been wound from a seventh node to an eighth node of the fourth inductor segment; and iii) a second return segment of the second electrical conductor electrically and physically connecting from the sixth node of the third inductor segment to the seventh node of the fourth inductor segment; and e) a second dielectric material contacting the third and fourth helically wound inductor segments and the second return segment, f) wherein the substantially aligned first and second helically wound inductor segments are wound in the same longitudinal direction along a first common length defined between the first and second nodes and between the third and fourth nodes to thereby provide a first bandstop filter inductance and a first bandstop filter capacitance comprising a first parasitic capacitance formed between the first and second facing planar surfaces that is sufficient to attenuate a first MRI RF pulsed frequency at or near a first RF resonant center frequency or range of frequencies, and g) wherein the substantially aligned third and fourth helically wound inductor segments are wound in the same longitudinal direction along a second common length is defined between the fifth and sixth nodes and between the seventh and eighth nodes to thereby provide a second bandstop filter inductance and a second bandstop filter capacitance comprising a second parasitic capacitance formed between the third and fourth facing planar surfaces that is sufficient to attenuate a second MRI RF pulsed frequency at or near a second RF resonant center frequency or range of frequencies, and wherein the first and second RF resonant center frequencies comprise substantially different frequencies. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification