Electromagnetic shield for a passive electronic component in an active medical device implantable lead
First Claim
Patent Images
1. An implantable lead, comprising:
- a) an implantable lead body having a length extending from a proximal end to a distal end;
b) a conductor disposed within the implantable lead body from the proximal end and terminating at the distal end comprising an electrode or sensor contactable with biological cells;
c) a passive electrical filter circuit comprising an inductor, a low pass filter or a bandstop filter having an equivalent electrical circuit schematic wherein an inductance is in parallel with a capacitance and having an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz such that the bandstop filter attenuates RF current flow over a range of frequencies; and
d) an electromagnetic shield at least partially surrounding the inductor, the low pass filter or the bandstop filter.
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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.
117 Citations
38 Claims
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1. An implantable lead, comprising:
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a) an implantable lead body having a length extending from a proximal end to a distal end; b) a conductor disposed within the implantable lead body from the proximal end and terminating at the distal end comprising an electrode or sensor contactable with biological cells; c) a passive electrical filter circuit comprising an inductor, a low pass filter or a bandstop filter having an equivalent electrical circuit schematic wherein an inductance is in parallel with a capacitance and having an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz such that the bandstop filter attenuates RF current flow over a range of frequencies; and d) an electromagnetic shield at least partially surrounding the inductor, the low pass filter or the bandstop filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An active fixation tip electrode disposed at a distal end of an implantable lead configured to be permanently or removably connectable to an active implantable medical device, comprising:
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a) an extendable and retractable helix coil electrode contactable with biological fluid or tissue; b) a bandstop filter disposed in series near, at or within the helix coil electrode, the bandstop filter comprising a self-resonant inductor having an inductance in parallel with a capacitance; c) a conductor attached in series to the bandstop filter and disposed opposite the helix coil electrode; and d) an electromagnetic shield at least partially surrounding the bandstop filter. - View Dependent Claims (15, 16, 17, 18)
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19. An active fixation tip electrode, comprising:
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a) a helix coil electrode contactable with biological tissue disposed at a distal end of an implantable lead; b) a bandstop filter disposed in series near, at or within the helix coil electrode, the bandstop filter comprising a self-resonant inductor, wherein a bandstop filter inductance comprises a coiled or spiral inductor, and wherein a bandstop filter capacitance comprises a parasitic capacitance between adjacent turns of the coiled or spiral inductor; c) a conductor attached in series to the bandstop filter opposite the helix coil electrode, the conductor electrically connected to the implantable lead; and d) an electromagnetic shield substantially surrounding the bandstop filter. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An active fixation tip electrode, comprising:
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a) a helix coil electrode connectable with biological tissue disposed at a distal end of an implantable lead; b) a passive electrical component comprising a self resonant inductor bandstop filter having an equivalent electrical schematic wherein an inductance is in parallel with a capacitance disposed in series near, at or within the helix coil electrode; and c) a conductor attached in series to the passive electrical component opposite the helix coil electrode, the conductor electrically connected to the implantable lead; d) wherein the passive electrical component comprises an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz, such that the passive electrical component attenuates RF current flow. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification