Circuits for minimizing heating of an implanted lead and/or providing EMI protection in a high power electromagnetic field environment
First Claim
Patent Images
1. An active implantable medical device (AIMD), comprising:
- a) a thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD;
b) a first conductive leadwire having a distal first leadwire end that is configured to be connectable to an implantable lead, and a proximal first leadwire end connected to the tissue-stimulating or biological sensing circuits inside the AIMD housing;
c) a second internal conductive leadwire having a proximal second leadwire end electrically coupled to the first leadwire at a node located inside the AIMD housing between the proximal and distal first leadwire ends, and a distal second leadwire end electrically coupled to the AIMD housing;
d) a first switch electrically coupled in series along the second internal leadwire somewhere between the proximal second internal leadwire end at the node and the distal second internal leadwire end at the AIMD housing; and
e) a second switch electrically coupled in series along the first leadwire between the node at the proximal second internal leadwire end and the proximal first leadwire end.
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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 and at least one non-linear circuit element switch for diverting energy in the implanted lead or the leadwire to the energy dissipating surface. In alternate configurations, the switch may be disposed so that it electrically opens the implanted lead or the leadwire when diverting energy to the energy dissipating surface. The non-linear circuit element switch is typically a PIN diode.
271 Citations
20 Claims
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1. An active implantable medical device (AIMD), comprising:
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a) a thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD; b) a first conductive leadwire having a distal first leadwire end that is configured to be connectable to an implantable lead, and a proximal first leadwire end connected to the tissue-stimulating or biological sensing circuits inside the AIMD housing; c) a second internal conductive leadwire having a proximal second leadwire end electrically coupled to the first leadwire at a node located inside the AIMD housing between the proximal and distal first leadwire ends, and a distal second leadwire end electrically coupled to the AIMD housing; d) a first switch electrically coupled in series along the second internal leadwire somewhere between the proximal second internal leadwire end at the node and the distal second internal leadwire end at the AIMD housing; and e) a second switch electrically coupled in series along the first leadwire between the node at the proximal second internal leadwire end and the proximal first leadwire end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active implantable medical device (AIMD), comprising:
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a) a thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits for the AIMD; b) a hermetic feedthrough supported by the AIMD housing, wherein the feedthrough comprises a first conductive leadwire having a distal first leadwire portion that is electrically isolated from the AIMD housing by an insulator, and a proximal first leadwire end located inside the AIMD housing and connected to the tissue-stimulating or biological-sensing circuits; c) a second internal conductive leadwire having a proximal second leadwire end electrically coupled to the first leadwire at a node located inside the AIMD housing between the feedthrough and the proximal first leadwire end, and a distal second internal leadwire end electrically coupled to the AIMD housing; d) a first switch electrically coupled in series along the second internal leadwire somewhere between the proximal second internal leadwire end at the node and the distal second internal leadwire end at the AIMD housing; and e) a second switch electrically coupled in series along the first leadwire between the node at the proximal second internal leadwire end and the proximal first leadwire end. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An active implantable medical device (AIMD) system, comprising:
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a) a thermally or electrically conductive AIMD housing containing tissue-stimulating or biological-sensing circuits; b) a hermetic feedthrough supported by the AIMD housing; c) an implantable lead having a length extending from an electrode that is contactable with biological tissue at a distal lead end to a proximal lead end functionally connected to the AIMD housing; and d) a switched diverter circuit comprising; i) a first conductive leadwire having a distal first leadwire portion that extends through the hermetic feedthrough to connect to the implantable lead and a proximal first leadwire end located inside the AIMD housing and connected to the tissue stimulating or biological-sensing circuits; ii) a second internal conductive leadwire having a proximal second leadwire end electrically coupled to the first leadwire at a node located inside the AIMD housing between the feedthrough and the proximal first leadwire end, and a distal second leadwire end electrically coupled to the AIMD housing; and iii) a first switch electrically coupled in series along the second internal leadwire somewhere between the proximal second internal leadwire end at the node and the distal second internal leadwire end at the AIMD housing; and iv) a second switch electrically coupled in series along the first leadwire between the node at the proximal second internal leadwire end and the proximal first leadwire end. - View Dependent Claims (17, 18, 19, 20)
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Specification