Multipin feedthrough containing a ground pin passing through an insulator and directly brazed to a ferrule
First Claim
Patent Images
1. A feedthrough, which comprises:
- a) an insulator of electrically non-conductive material having a thickness defined by an insulator side wall extending to and meeting with a first insulator side and a second insulator side, wherein the insulator has at least one lead wire bore extending from the first side to the second side thereof and at least one ground pin bore;
b) a recess in the insulator extending from the first insulator side part way through the insulator thickness to a recess bottom;
c) a lead wire received in the lead wire bore, the lead wire having opposed first and second ends disposed spaced from the respective first and second sides of the insulator;
d) a ground pin received in the ground pin bore, the ground pin having opposed third and fourth ends disposed spaced from the respective recess bottom and the second side of the insulator;
e) a ferrule of an electrically conductive material and comprising a surrounding sidewall extending to a first ferrule side and a second ferrule side, wherein the ferrule sidewall surrounds the insulator supported therein with the recess bottom disposed between the first ferrule side and the second ferrule side; and
f) a first braze material hermetically sealing the lead wire to the insulator and a second braze material hermetically sealing the insulator and the ground pin electrically connected to the ferrule by the second,braze material.
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Abstract
A filtered feedthrough including a ferrule surrounding an insulator supporting one or more lead wires and at least one ground pin is described. The insulator defines a channel cutout extending from a first insulator side to a channel cutout bottom part way through the thickness of the insulator and in communication with the ferrule. An attached filter capacitor shunts electromagnetic interference from the lead wire to the ground pin, and the ground pin is in electrical communication with the ferrule by way of a ferrule-ground pin braze joint formed in the channel cutout.
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Citations
35 Claims
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1. A feedthrough, which comprises:
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a) an insulator of electrically non-conductive material having a thickness defined by an insulator side wall extending to and meeting with a first insulator side and a second insulator side, wherein the insulator has at least one lead wire bore extending from the first side to the second side thereof and at least one ground pin bore;
b) a recess in the insulator extending from the first insulator side part way through the insulator thickness to a recess bottom;
c) a lead wire received in the lead wire bore, the lead wire having opposed first and second ends disposed spaced from the respective first and second sides of the insulator;
d) a ground pin received in the ground pin bore, the ground pin having opposed third and fourth ends disposed spaced from the respective recess bottom and the second side of the insulator;
e) a ferrule of an electrically conductive material and comprising a surrounding sidewall extending to a first ferrule side and a second ferrule side, wherein the ferrule sidewall surrounds the insulator supported therein with the recess bottom disposed between the first ferrule side and the second ferrule side; and
f) a first braze material hermetically sealing the lead wire to the insulator and a second braze material hermetically sealing the insulator and the ground pin electrically connected to the ferrule by the second,braze material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A filtered feedthrough, which comprises:
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a) an insulator of electrically non-conductive material having a thickness defined by an insulator side wall extending to and meeting with a first insulator side and a second insulator side, wherein the insulator has at least one lead wire bore extending from the first side to the second side thereof and at least one ground pin bore;
b) a recess in the insulator extending from the first insulator side part way through the insulator thickness to a recess bottom;
c) a lead wire received in the lead wire bore, the lead wire having opposed first and second ends disposed spaced from the respective first and second sides of the insulator;
d) a ground pin received in the ground pin bore, the ground pin having opposed third and fourth ends disposed spaced from the respective recess bottom and the second side of the insulator;
e) a ferrule of an electrically conductive material and comprising a surrounding sidewall extending to a first ferrule side and a second ferrule side, wherein the ferrule sidewall surrounds the insulator supported therein with the recess bottom disposed between the first ferrule side and the second ferrule side;
f) a first braze material hermetically sealing the lead wire to the insulator and a second braze material hermetically sealing the insulator and the ground pin electrically connected to the ferrule by the second braze material; and
g) a filter capacitor in electrical communication with the at least one lead wire and the at least one ground pin, wherein the filter capacitor provides for shunting electromagnetic interference from the lead wire to the ground pin in electrical communication with the ferrule along the second braze. - View Dependent Claims (17, 18, 19, 20)
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21. An insulator for a feedthrough, the insulator of an electrically non-conductive material and comprising:
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a) an insulator sidewall defining a thickness extending to and meeting with a first insulator side and a second insulator side;
b) a recess in the insulator extending from the first insulator side part way through the insulator thickness to a recess bottom;
c) at least one lead wire bore extending from the first side to the second side of the insulator; and
d) at least one ground pin bore extending from the first insulator side to the recess bottom. - View Dependent Claims (22, 23)
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24. A method for providing a feedthrough, comprising the steps of:
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a) providing an insulator of electrically non-conductive material having a thickness defined by an insulator sidewall extending to and meeting with a first insulator side and a second insulator side, the insulator provided with at least one lead wire bore extending from the first side to the second side thereof and at least one ground pin bore;
b) forming a recess in the insulator extending from the first insulator side part way through the insulator thickness to a recess bottom;
c) positioning a lead wire in the lead wire bore, the lead wire having opposed first and second ends disposed spaced from the respective first and second sides of the insulator;
d) positioning a ground pin received in the ground pin bore, the ground pin having opposed third and fourth ends disposed spaced from the respective recess bottom and the second side of the insulator;
e) providing a ferrule of an electrically conductive material comprising a surrounding sidewall extending to a first ferrule side and a second ferrule side;
f) supporting the insulator inside the surrounding ferrule sidewall with the recess bottom disposed between the first ferrule side and the second ferrule side;
g) brazing a first material sealing between the lead wire and the insulator; and
h) brazing a second material sealing between the insulator and the ground pin electrically connected to the ferrule. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification