Tank filters placed in series with the lead wires or circuits of active medical devices to enhance MRI compatability
First Claim
1. A hermetically sealed feedthrough terminal for an active implantable medical device, the feedthrough terminal comprising:
- a) a ferrule;
b) a conductor passing through the ferrule in nonconductive relation, wherein the conductor comprises a hermetic seal separating a body fluid side from a device side; and
c) a TANK filter electrically coupled in series along the conductor, wherein the TANK filter is disposed at, near or within the ferrule.
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Accused Products
Abstract
A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
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Citations
38 Claims
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1. A hermetically sealed feedthrough terminal for an active implantable medical device, the feedthrough terminal comprising:
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a) a ferrule; b) a conductor passing through the ferrule in nonconductive relation, wherein the conductor comprises a hermetic seal separating a body fluid side from a device side; and c) a TANK filter electrically coupled in series along the conductor, wherein the TANK filter is disposed at, near or within the ferrule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hermetically sealed feedthrough terminal for an active implantable medical device, the feedthrough terminal comprising:
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a) a ferrule; b) an insulator attached inside the ferrule; c) a conductor passing through the insulator in nonconductive relation to the ferrule; d) at least one hermetic seal between the insulator and the conductor separating a body fluid side from a device side; and e) a TANK filter electrically coupled in series along the conductor, wherein the TANK filter is disposed at, near or within the ferrule. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A hermetically sealed feedthrough terminal for an active implantable medical device, the feedthrough terminal comprising:
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a) a ferrule; b) an insulator attached inside the ferrule; c) a conductor passing through the insulator in nonconductive relation to the ferrule; d) at least one hermetic seal between the insulator and the conductor separating a body fluid side from a device side; e) a feedthrough capacitor attached to the ferrule on the device side, the feedthrough capacitor comprising at least one ground electrode plate and at least one active electrode plate disposed within a dielectric substrate, wherein the at least one ground electrode plate is electrically coupled to the ferrule and the at least one active electrode plate is electrically coupled to the conductor; and f) a TANK filter electrically coupled in series along the conductor on the device side protected from a patient'"'"'s bodily fluids, wherein the TANK filter is disposed at, near or within the ferrule. - View Dependent Claims (24, 25, 26)
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27. An active implantable medical device (AIMD), the active implantable medical device comprising:
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a) a hermetically sealed housing comprising an electronic circuit disposed within the housing; b) a ferrule hermetically sealed to the housing; c) an insulator attached inside the ferrule; d) a conductor passing through the insulator in nonconductive relation to the ferrule and electrically coupled to the electronic circuit; e) at least one hermetic seal between the insulator and the conductor separating a body fluid side from a device side; and f) a TANK filter electrically coupled in series along the conductor on the device side protected from a patient'"'"'s bodily fluids, wherein the TANK filter is disposed at, near or within the ferrule, wherein the TANK filter comprises an inductance in parallel with a capacitance selected so as to be resonant at or near an MRI RF frequency or over a range of MRI RF frequencies of electromagnetic radiation. - View Dependent Claims (28, 29)
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30. A hermetically sealed feedthrough terminal for an active implantable medical device, the feedthrough terminal comprising:
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a) a hermetically sealed conductive housing containing at least one electronic circuit disposed within the housing; b) an insulator attached inside an opening in the housing; c) a conductor passing through the insulator in nonconductive relation to the housing; d) at least one hermetic seal between the insulator and the conductor separating a body fluid side from a device side; e) a feedthrough capacitor attached to or near the insulator on the device side, the feedthrough capacitor comprising at least one ground electrode plate and at least one active electrode plate disposed within a dielectric substrate, wherein the at least one ground electrode plate is electrically coupled to the housing and the at least one active electrode plate is electrically coupled to the conductor; and f) a TANK filter electrically coupled in series along the conductor on the device side protected from a patient'"'"'s bodily fluids, wherein the TANK filter is disposed at, near or within the housing. - View Dependent Claims (31, 32, 33)
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34. An active implantable medical device, comprising:
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a) a hermetically sealed housing defined as comprising a perimeter surface separating a body fluid side from a device side; b) a conductor passing through the housing in nonconductive relation; and c) a TANK filter electrically coupled in series along the conductor disposed at, near or within the perimeter surface of the housing. - View Dependent Claims (35, 36, 37, 38)
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Specification