Switched safety protection circuit for an AIMD system during exposure to high power electromagnetic fields
First Claim
Patent Images
1. An implantable medical device (AIMD), comprising:
- a) a hermetically sealed and thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD;
b) a hermetic feedthrough terminal supported by the AIMD housing, wherein the feedthrough comprisesat least one first conductive leadwire comprising a first conductive path, the at least one first leadwire having a distal first leadwire portion that is connectable to at least one conductor of an implantable lead and electrically isolated from the AIMD housing by an insulator, and wherein the at least one first leadwire has a proximal first leadwire end located inside the AIMD housing;
c) a single or multi-pole double throw switch residing inside the AIMD housing and being electrically couplable in series with and uncouplable from the at least one first leadwire of the first conductive path, the switch comprising a first throw end, a second throw end, and a switch pole end, wherein the switch pole end is permanently electrically coupled to the tissue-stimulating or biological-sensing circuits, and the first throw end is at and electrically connected to the proximal first leadwire end; and
d) a second conductive path permanently electrically coupled between the second throw end of the switch and the conductive AIMD housing; and
e) wherein the switch is configured to be selectively actuatable in response to a programmable telemetry signal to either electrically connect the switch pole end to the first throw end or connect the switch pole end to the second throw end.
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Accused Products
Abstract
An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch disposed between the diversion circuit and the AIMD electronics for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter.
7 Citations
21 Claims
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1. An implantable medical device (AIMD), comprising:
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a) a hermetically sealed and thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD; b) a hermetic feedthrough terminal supported by the AIMD housing, wherein the feedthrough comprises at least one first conductive leadwire comprising a first conductive path, the at least one first leadwire having a distal first leadwire portion that is connectable to at least one conductor of an implantable lead and electrically isolated from the AIMD housing by an insulator, and wherein the at least one first leadwire has a proximal first leadwire end located inside the AIMD housing; c) a single or multi-pole double throw switch residing inside the AIMD housing and being electrically couplable in series with and uncouplable from the at least one first leadwire of the first conductive path, the switch comprising a first throw end, a second throw end, and a switch pole end, wherein the switch pole end is permanently electrically coupled to the tissue-stimulating or biological-sensing circuits, and the first throw end is at and electrically connected to the proximal first leadwire end; and d) a second conductive path permanently electrically coupled between the second throw end of the switch and the conductive AIMD housing; and e) wherein the switch is configured to be selectively actuatable in response to a programmable telemetry signal to either electrically connect the switch pole end to the first throw end or connect the switch pole end to the second throw end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device (AIMD), comprising:
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a) a hermetically sealed and thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD; b) a hermetic feedthrough terminal supported by the AIMD housing, wherein the feedthrough comprises at least one first conductive leadwire comprising a first conductive path, the first leadwire having a distal first leadwire portion that is connectable to at least one conductor of an implantable lead and electrically isolated from the AIMD housing by an insulator, and wherein the at least one first leadwire has a proximal first leadwire end located inside the AIMD housing; c) a single or multi-pole double throw switch residing inside the AIMD housing and being electrically couplable in series with and uncouplable from the at least one first leadwire of the first conductive path, the switch comprising a first throw end, a second throw end, and a switch pole end, wherein the switch pole end is permanently electrically coupled to the tissue-stimulating or biological-sensing circuits, and the first throw end is at and electrically connected to the proximal first leadwire end; and d) a second conductive path permanently electrically coupled between the second throw end of the switch and the conductive AIMD housing; e) wherein the switch is configured to be selectively actuatable in response to a programmable telemetry signal to either connect the switch pole end to the first throw end in a first or normal operating mode or connect the switch pole end to the second throw end in a second or MRI mode. - View Dependent Claims (13, 14, 15, 16)
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17. An implantable medical device (AIMD), comprising:
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a) a hermetically sealed and thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD; b) a hermetic feedthrough terminal supported by the AIMD housing, wherein the feedthrough comprises at least one first conductive leadwire comprising a first conductive path, the at least one first leadwire having a distal first leadwire portion that is connectable to at least one conductor of an implantable lead and electrically isolated from the AIMD housing by an insulator, and wherein the at least one leadwire has a proximal first leadwire end located inside the AIMD housing; c) a single or multi-pole double throw switch residing inside the AIMD housing and being electrically couplable in series with and uncouplable from the at least one first leadwire of the first conductive path, the switch comprising a first throw end, a second throw end, and a switch pole end, wherein the switch pole end is permanently electrically coupled to the tissue-stimulating or biological-sensing circuits, and the first throw end is at and electrically connected to the proximal first leadwire end; and d) a second conductive path permanently electrically coupled between the second throw end of the switch and the conductive AIMD housing; e) wherein the switch is configured to he automatically actuatable in response to a magnetic resonance B0 field sensor that, in the absence of a static magnetic field, electrically connects the switch pole end to the first throw end, and in the presence of a static magnetic field, disconnects the switch pole end from the first throw end and electrically connects the switch pole end to the second throw end. - View Dependent Claims (18, 19, 20, 21)
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Specification