Dual function tuned L-C input trap passive EMI filter component network for an active implantable medical device
First Claim
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1. An active implantable medical device (AIMD) comprising a dual function passive component input filter network, the active implantable medical device comprising:
- a) an electromagnetically shielded AIMD housing;
b) at least one electronic sensing or therapy delivery circuit disposed within the AIMD housing;
c) a first conductive path having a primary series inductance and extending from a first conductive path first end at the at least one electronic sensing or therapy delivery circuit to a first conductive path second end at a feedthrough connected to the AIMD housing, the feedthrough connectable to an implantable lead; and
d) a second conductive path having a primary series capacitance and extending from a second conductive path first end connected anywhere along the first conductive path between the primary series inductance and the at least one electronic sensing or therapy delivery circuit to a second conductive path second end connected to the AIMD housing,e) wherein the primary series capacitance and the primary series inductance comprise an L-section broadband low pass electromagnetic interference (EMI) filter configured to protect the electronic sensing or therapy delivery circuit; and
f) wherein the primary series inductance and the primary series capacitance also form a resonant L-C trap filter between the first conductive path second end to the second conductive path second end configured to divert RF energy induced at the feedthrough at the second end of the first conductive path to the AIMD housing.
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Abstract
Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to the housing for an active implantable medical device (AIMD) which serves as an energy dissipating surface. A novel L-C input trap filter is provided which has a dual function. The L-C trap acts as a broadband low pass EMI filter while at the same time also acts as an L-C trap in order to divert induced RF energy from the lead to the housing of the AIMD.
27 Citations
37 Claims
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1. An active implantable medical device (AIMD) comprising a dual function passive component input filter network, the active implantable medical device comprising:
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a) an electromagnetically shielded AIMD housing; b) at least one electronic sensing or therapy delivery circuit disposed within the AIMD housing; c) a first conductive path having a primary series inductance and extending from a first conductive path first end at the at least one electronic sensing or therapy delivery circuit to a first conductive path second end at a feedthrough connected to the AIMD housing, the feedthrough connectable to an implantable lead; and d) a second conductive path having a primary series capacitance and extending from a second conductive path first end connected anywhere along the first conductive path between the primary series inductance and the at least one electronic sensing or therapy delivery circuit to a second conductive path second end connected to the AIMD housing, e) wherein the primary series capacitance and the primary series inductance comprise an L-section broadband low pass electromagnetic interference (EMI) filter configured to protect the electronic sensing or therapy delivery circuit; and f) wherein the primary series inductance and the primary series capacitance also form a resonant L-C trap filter between the first conductive path second end to the second conductive path second end configured to divert RF energy induced at the feedthrough at the second end of the first conductive path to the AIMD housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An active implantable medical device (AIMD), comprising:
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a) a conductive device housing for the medical device, wherein the device housing provides an energy dissipating surface as a first node; b) at least one electronic sensing or therapy delivery circuit connected along a conductipath to a second node disposed within the device housing; c) a third node at or near a device feedthrough terminal or ferrule disposed in the device housing, wherein an electrical pathway passes through the device feedthrough terminal or ferrule in non-conductive relation to the device housing or the ferrule wherein the third node is connectable to an electrode configured for tissue-stimulating or biological-sensing; d) a first inductance disposed between the second and third nodes; and e) first capacitance disposed between the first and second nodes, f) wherein the first inductance and the first capacitance form an L-section broadband low pass electromagnetic interference (EMI) filter for protecting the at least one electronic sensing or therapy delivery circuit; and g) wherein the first inductance and the first capacitance also form a resonant L-C trap filter between the third node and the first node for diverting RF energy induced at the third node to the device housing. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification