Frequency selective passive component networks for implantable leads of active implantable medical devices utilizing an energy dissipating surface
First Claim
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1. A passive component network for an implantable lead of an active implantable medical device (AIMD), comprising:
- at least one leadwire having a length extending between and to a proximal end and a tissue-stimulating or biological-sensing electrode at a distal end;
an energy dissipating surface disposed adjacent to tissue or within the blood or lymph flow of a patient at a point distant from the electrode; and
a diversion circuit associated with the leadwire, for selectively diverting high-frequency energy away from the electrode to said energy dissipating surface for dissipation of said high-frequency energy as heat, said diversion circuit comprising a low pass filter.
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Abstract
Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to an energy dissipating surface. This is accomplished through broadband filtering or by resonant filtering. In a passive component network for an implantable leadwire of an active implantable medical device, a frequency selective energy diversion circuit is provided for diverting high-frequency energy away from a leadwire electrode to a point or an area spaced from the electrode, for dissipation of high-frequency energy.
124 Citations
16 Claims
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1. A passive component network for an implantable lead of an active implantable medical device (AIMD), comprising:
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at least one leadwire having a length extending between and to a proximal end and a tissue-stimulating or biological-sensing electrode at a distal end; an energy dissipating surface disposed adjacent to tissue or within the blood or lymph flow of a patient at a point distant from the electrode; and a diversion circuit associated with the leadwire, for selectively diverting high-frequency energy away from the electrode to said energy dissipating surface for dissipation of said high-frequency energy as heat, said diversion circuit comprising a low pass filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A passive component network for an implantable lead of an active implantable medical device (AIMD), comprising:
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at least one leadwire having a length extending between and to a proximal end and a tissue-stimulating or biological-sensing electrode at a distal end; an energy dissipating surface disposed adjacent to tissue or within the blood or lymph flow of a patient at a point distant from the electrode; and a diversion circuit associated with the leadwire, for selectively diverting high-frequency energy away from the electrode to said energy dissipating surface for dissipation of said high-frequency energy as heat, said diversion circuit comprising at least one series resonant L-C trap filter.
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15. A passive component network for an implantable lead of an active implantable medical device (AIMD), comprising:
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at least one leadwire having a length extending between and to a proximal end and a tissue-stimulating or biological-sensing electrode at a distal end; an energy dissipating surface disposed adjacent to tissue or within the blood or lymph flow of a patient at a point distant from the electrode; a diversion circuit associated with the leadwire, for selectively diverting high-frequency energy away from the electrode to said energy dissipating surface for dissipation of said high-frequency energy as heat, said diversion circuit comprising at least one series resonant L-C-trap filter; and an impeding circuit associated with the diversion circuit, for raising the high-frequency impedance of the leadwire, said impeding circuit being disposed between said diversion circuit and the distal end of said at least one leadwire. - View Dependent Claims (16)
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Specification