Apparatus and process for reducing the susceptibility of active implantable medical devices to medical procedures such as magnetic resonance imaging
First Claim
1. A feedthrough terminal assembly having magnetic shielding characteristics, comprising:
- a conductive support defining a central aperture;
an insulator disposed over the central aperture of the conductive support, having a conductive plate embedded in the insulator forming an interior magnetic shield across substantially the entire central aperture of the conductive support;
a feedthrough capacitor disposed on an axial side of the insulator, the feedthrough capacitor having first and second sets of electrode plates, the second set of electrode plates being conductively coupled to the conductive support or a ground plane; and
a lead wire extending through the insulator and the feedthrough capacitor in non-conductive relation with the conductive support and conductively coupled to the first set of electrode plates.
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Accused Products
Abstract
A feedthrough terminal assembly for an active implantable medical device (AIMD) includes magnetic shielding elements to block incident magnetic fields during medical procedures such as Magnetic Resonance Imaging. The assembly includes conductive or ground plate(s) embedded in an insulator surrounding elements of the assembly, a plurality of lead wires extending from electronic circuitry of the AIMD, and a lossy ferrite inductor through which the lead wires extend in non-conductive relation for increasing the impedance of the lead wires at selected RF frequencies. Alternatively, the assembly includes a conductive sleeve or cap surrounding the feedthrough capacitor and/or conductive support.
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Citations
52 Claims
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1. A feedthrough terminal assembly having magnetic shielding characteristics, comprising:
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a conductive support defining a central aperture; an insulator disposed over the central aperture of the conductive support, having a conductive plate embedded in the insulator forming an interior magnetic shield across substantially the entire central aperture of the conductive support; a feedthrough capacitor disposed on an axial side of the insulator, the feedthrough capacitor having first and second sets of electrode plates, the second set of electrode plates being conductively coupled to the conductive support or a ground plane; and a lead wire extending through the insulator and the feedthrough capacitor in non-conductive relation with the conductive support and conductively coupled to the first set of electrode plates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A feedthrough terminal assembly having magnetic shielding characteristics, comprising:
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a conductive support defining a central aperture; an insulator disposed over the central aperture of the conductive support; an magnetic shield disposed across substantially the entire central aperture of the conductive support; a feedthrough capacitor disposed on an axial side of the insulator, the feedthrough capacitor having first and second sets of electrode plates, the second set of electrode plates being conductively coupled to the conductive support or a ground plane; and a lead wire extending through the insulator and the feedthrough capacitor in non-conductive relation with the conductive support and conductively coupled to the first set of electrode plates. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A feedthrough terminal assembly having magnetic shielding characteristics, comprising:
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a conductive support defining a central aperture; an insulator disposed over the central aperture of the conductive support; a magnetic shield cup disposed on an axial side of the insulator wherein the magnetic shield covers substantially the entire central aperture of the conductive support; a feedthrough capacitor disposed internally in the magnetic shield cup on the same axial side of the insulator, the feedthrough capacitor having first and second sets of electrode plates, the second set of electrode plates being conductively coupled to the conductive support or a ground plane; and a lead wire extending through the insulator, the feedthrough capacitor and the magnetic shield cup in non-conductive relation with the conductive support and conductively coupled to the first set of electrode plates. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A feedthrough terminal assembly having magnetic shielding characteristics, comprising:
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a conductive support defining a central aperture; an insulator disposed over the central aperture of the conductive support having a conductive ground plate embedded in the insulator forming an interior magnetic shield across substantially the entire central aperture of the conductive support in conductive relation with the conductive support or a ground plane; a feedthrough capacitor disposed on an axial side of the insulator, the feedthrough capacitor having first and second sets of electrode plates; a lead wire extending through the insulator and the feedthrough capacitor in non-conductive relation with the conductive support and conductively coupled to the first set of electrode plates; and a conductive ground pin extending through the feedthrough capacitor in conductive relation with the second set of electrode plates and extending into the insulator in conductive relation with the conductive ground plate. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification