Implantable lead having a shielded bandstop filter comprising a self-resonant inductor for an active medical device
First Claim
1. An implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
- a) a conductor having a length extending from a proximal end to a distal end;
b) a distal electrode contactable with biological cells inside a human body, the distal electrode being electrically connected to the distal end of the conductor;
c) a bandstop filter disposed in series along the length of the conductor, the bandstop filter comprising a self-resonant inductor having an equivalent circuit comprising an inductance in parallel with a parasitic capacitance; and
d) an electromagnetic shield substantially surrounding the bandstop filter,e) wherein the bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the electromagnetic shield,f) wherein at least one of the inductance and the parasitic capacitance is adjusted to account for a frequency shift between the first and second resonant center frequencies,g) wherein the second resonant center frequency is about 63.84 MHz,h) wherein the frequency shift between the first and second resonant center frequencies is greater than 4.3MHz or 6.8% of the about 63.84 MHz, andi) wherein the bandstop filter comprises a circuit Q, wherein the resultant 3 dB bandwidth is at least 100 kHz, such that when in the surrounded relationship with the electromagnetic shield, the bandstop filter attenuates RF current flow substantially about the second resonant center frequency.
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Accused Products
Abstract
A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded.
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Citations
30 Claims
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1. An implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
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a) a conductor having a length extending from a proximal end to a distal end; b) a distal electrode contactable with biological cells inside a human body, the distal electrode being electrically connected to the distal end of the conductor; c) a bandstop filter disposed in series along the length of the conductor, the bandstop filter comprising a self-resonant inductor having an equivalent circuit comprising an inductance in parallel with a parasitic capacitance; and d) an electromagnetic shield substantially surrounding the bandstop filter, e) wherein the bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the electromagnetic shield, f) wherein at least one of the inductance and the parasitic capacitance is adjusted to account for a frequency shift between the first and second resonant center frequencies, g) wherein the second resonant center frequency is about 63.84 MHz, h) wherein the frequency shift between the first and second resonant center frequencies is greater than 4.3MHz or 6.8% of the about 63.84 MHz, and i) wherein the bandstop filter comprises a circuit Q, wherein the resultant 3 dB bandwidth is at least 100 kHz, such that when in the surrounded relationship with the electromagnetic shield, the bandstop filter attenuates RF current flow substantially about the second resonant center frequency. - View Dependent Claims (2, 3, 4)
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5. An. implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
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a) a conductor having a length extending from a proximal end to a distal end; b) a distal electrode contactable with biological cells inside a human body, the distal electrode being electrically connected to the distal end of the conductor; c) a bandstop filter disposed in series along the length of the conductor, the bandstop filter comprising a self-resonant inductor having an equivalent circuit comprising an inductance in parallel with a parasitic capacitance; and d) an electromagnetic shield substantially surrounding the bandstop filter, wherein the electromagnetic shield is selected from the group consisting of platinum, platinum-iridium, and titanium, e) wherein the bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the electromagnetic shield, f) wherein at least one of the inductance and the parasitic capacitance is adjusted to account for a shift between the first and second resonant center frequencies, g) wherein the second resonant center frequency comprises about an MRI Lamar frequency, h) wherein a frequency shift between the first and second resonant center frequencies is greater than 4.3 MHz or 6.8% of the MRI Larmor frequency, and i) wherein the bandstop filter comprises a circuit Q wherein the resultant 3 dB bandwidth is at least 100 kHz, such that when in the surrounded relationship with the electromagnetic shield, the bandstop filter attenuates RF current flow substantially about the second resonant center frequency. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
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a) a first electrode contactable with biological cells inside a human body, the first electrode being disposed at a distal end of the implantable lead; b) a first conductor having a first length extending from the first electrode to at or near a proximal end of the implantable lead, the first conductor being electrically coupled to the first electrode; c) a second electrode contactable with biological cells inside the human body, the second electrode being disposed between the first electrode and the proximal end of the implantable lead; d) a second conductor having a second length extending from the second electrode to at or near the proximal end of the implantable lead, the second conductor being electrically coupled to the second electrode; e) a first bandstop filter electrically coupled in series along the first conductor, the first bandstop filter being disposed between the first and second electrodes, wherein the first bandstop filter comprises a first self-resonant inductor having a first equivalent circuit comprising a first inductance in parallel with a first parasitic capacitance; f) a second bandstop filter electrically coupled in series along the second conductor, the second bandstop filter being disposed between the second electrode and the proximal end of the implantable lead, wherein the second bandstop filter comprises a second self-resonant inductor having a second equivalent circuit comprising a second inductance in parallel with a second parasitic capacitance, g) wherein the first electrode, the first conductor, the second electrode and the second conductor comprise an implantable transvenous single chamber bipolar cardiac lead; and h) a first electromagnetic shield substantially surrounding the first bandstop filter, i) wherein the first bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the first electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the first electromagnetic shield, j) wherein at least one of the first inductance and the first parasitic capacitance is adjusted to account for a shift between the first and second resonant center frequencies, k) wherein the first bandstop filter comprises a first circuit Q, wherein the resultant 3 dB bandwidth is at least 100 kHz, such that when in the surrounded relationship with the first electromagnetic shield, the first bandstop filter attenuates RF current flow substantially about the second resonant center frequency, and l) wherein the second bandstop filter comprises a second circuit Q, wherein the resultant 3 dB bandwidth is at least 100 kHz. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An implantable bipolar pacemaker lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
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a) a first electrode contactable with biological cells inside a human body, the first electrode being disposed at a distal end of the implantable lead; b) a first conductor having a first length extending from the first electrode to at or near a proximal end of the implantable lead, the first conductor being electrically coupled to the first electrode; c) second electrode contactable with biological cells inside the human body, the second electrode being disposed between the first electrode and the proximal end of the implantable lead; d) a second conductor having a second length extending from the second electrode to at or near the proximal end of the implantable lead, the second conductor being electrically coupled to the second electrode; e) a first resonant filter comprising at least one inductor electrically coupled in series along the first conductor, the first resonant filter being disposed between the first and second electrodes; f) a second resonant filter comprising at least one inductor electrically coupled in series along the second conductor, the second resonant filter being disposed between the second electrode and the proximal end of the implantable lead, g) wherein the first electrode, the first conductor, the second electrode and the second conductor comprise an implantable transvenous single chamber bipolar cardiac lead, h) wherein at least the first resonant filter is surrounded by a first shield, and i) wherein at least the first resonant filter comprises a first resonant center frequency when not in the surrounded relationship with the first shield and a second resonant center frequency when in the surrounded relationship with the first shield. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising:
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a) a conductor having a length extending from a proximal end to a distal end; b) a distal electrode contactable with biological cells inside a human body, the distal electrode being electrically connected to the distal end of the conductor; c) a bandstop filter disposed in series along the length of the conductor, the bandstop filter comprising a self-resonant inductor having an equivalent circuit comprising an inductance in parallel with a parasitic capacitance; and d) an electromagnetic shield substantially surrounding the bandstop filter, e) wherein the bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the electromagnetic shield, f) wherein the inductance or parasitic capacitance is adjusted to account for a shift in frequency between the first and second resonant center frequencies, g) wherein the second resonant center frequency is about 63.84 MHz, h) wherein the shift in frequency between the first and second resonant center frequencies is greater than 4.3 MHz or 6.8% of the about 63.84 MHz, and i) wherein the bandstop filter comprises a circuit Q, wherein the resultant 3 dB bandwidth is on the order of MHz, such that when in the surrounding relationship with the electromagnetic shield, the bandstop filter attenuates RF current flow substantially about the second resonant center frequency.
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Specification