Active implantable medical system having EMI shielded lead
First Claim
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1. An implantable medical system, comprising:
- a) an active implantable medical device (AIMD) comprising electronic circuitry hermetically contained inside a device housing, wherein the device housing serves as a conductive equipotential surface;
b) a hermetic feedthrough terminal supported by the device housing;
c) at least one lead comprising;
i) at least one electrical conductor having a length extending from a proximal conductor portion having a proximal conductor end to a distal conductor portion having a distal conductor end, wherein the proximal conductor portion extends through the hermetic feedthrough terminal in a non-conductive relationship with the device housing, and wherein the proximal conductor end is electrically connected to the electronic circuitry housed inside the device housing;
ii) at least one biological sensing or stimulating electrode, wherein the at least one electrode is electrically connected to the distal conductor portion or the distal conductor end.; and
iii) at least. one electromagnetic interference (EMI) shield surrounding the at least one electrical conductor in a non-conductive relationship therewith, wherein the EMI shield extends along at least a portion of the conductor length,d) wherein a proximal end of the EMI shield by-passes the hermetic feedthrough terminal outside the device housing and is conductively shunted directly to the device housing serving as the conductive equipotential surface.
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Abstract
A lead extending exteriorly from an active implantable medical device (AIMD) is at least partially ensheathed within an electromagnetic interference (EMI) shield. The AIMD has a conductive equipotential surface to which the EMI shield may be conductively coupled. An impeding circuit may be provided for raising the high frequency impedance of the lead. An energy diversion circuit may also be provided for conductively coupling the lead to the EMI shield.
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Citations
37 Claims
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1. An implantable medical system, comprising:
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a) an active implantable medical device (AIMD) comprising electronic circuitry hermetically contained inside a device housing, wherein the device housing serves as a conductive equipotential surface; b) a hermetic feedthrough terminal supported by the device housing; c) at least one lead comprising; i) at least one electrical conductor having a length extending from a proximal conductor portion having a proximal conductor end to a distal conductor portion having a distal conductor end, wherein the proximal conductor portion extends through the hermetic feedthrough terminal in a non-conductive relationship with the device housing, and wherein the proximal conductor end is electrically connected to the electronic circuitry housed inside the device housing; ii) at least one biological sensing or stimulating electrode, wherein the at least one electrode is electrically connected to the distal conductor portion or the distal conductor end.; and iii) at least. one electromagnetic interference (EMI) shield surrounding the at least one electrical conductor in a non-conductive relationship therewith, wherein the EMI shield extends along at least a portion of the conductor length, d) wherein a proximal end of the EMI shield by-passes the hermetic feedthrough terminal outside the device housing and is conductively shunted directly to the device housing serving as the conductive equipotential surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 37)
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19. An implantable medical system, comprising:
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a) an active implantable medical device (AIMD) comprising electronic circuitry hermetically contained inside a device housing, wherein the device housing serves as a conductive equipotential surface; b) a hermetic feedthrough terminal supported by the device housing; c) at least one lead comprising; i) at least one electrical conductor having a length extending from a proximal conductor portion having a proximal conductor end to a distal conductor portion having a distal conductor end, wherein the proximal conductor portion extends through the hermetic feedthrough terminal in a non-conductive relationship with the device housing, and wherein the proximal conductor end is electrically connected to the electronic circuitry housed inside the device housing; ii) at least one biological sensing or stimulating electrode, wherein the at least one electrode is electrically connected to the distal conductor portion or the distal conductor end; and iii) at least one electromagnetic interference (EMT) shield surrounding the at least one electrical conductor in a non-conductive relationship therewith, wherein the EMI shield extends along at least a portion of the conductor length, d) wherein the EMI shield is an electrically conductive exterior surface suitable for long-term exposure to body tissues and fluids and wherein a proximal end of the EMI shield by-passes the hermetic feedthrough terminal outside the device housing and is conductively shunted directly to the device housing serving as the conductive equipotential surface. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An implantable medical system, comprising:
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a) an active implantable medical device (AND) comprising electronic circuitry hermetically contained inside a device housing, wherein the device housing serves as a conductive equipotential surface; b) a hermetic terminal supported by the device housing; c) at least one lead comprising; i) at least one electrical conductor having a length extending from a proximal conductor portion having a proximal conductor end to a distal conductor portion having a distal conductor end, wherein the proximal conductor portion extends through the hermetic feedthrough terminal in a non-conductive relationship with the device housing, and wherein the proximal conductor end is electrically connected to the electronic circuitry housed inside the device housing; ii) at least one biological sensing or stimulating electrode, wherein the at least one electrode is electrically connected to the distal conductor portion or the distal conductor end; and iii) at least one electromagnetic interference (EMI) shield comprising a conductive heat-shrink tubing surrounding the at least one electrical conductor in a non-conductive relationship therewith, wherein the EMI shield extends along at least a portion of the conductor length, d) wherein a proximal end of the EMI shield by-passes the hermetic feedthrouah terminal outside the device housing and is conductively shunted directly to the device housing serving as the conductive equipotential surface.
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Specification