Implantable pulse generator feedthrough
First Claim
1. An improved hermetic, leak-proof, corrosion resistant electrical feedthrough, particularly adaptable to miniaturization and multi-pin construction and to IPG use, the feedthrough having substantially matched-expansion/compression joints and comprising:
- at least one electrical lead wire consisting essentially of a metal or alloy selected from the group consisting of niobium, tantalum, tungsten, molybdenum and alloys thereof;
an alumina insulator positioned around a portion of the lead wire intermediate the ends thereof, the insulator including a niobium coated braze area electrically remote from the lead wire;
a ferrule consisting essentially of titanium or niobium positioned around the niobium area of the alumina insulator for receiving same in sealing relationship,a braze consisting essentially of gold joining and sealing the ferrule to the insulator in the area of the niobium coating thereon, anda body of fusible glass joining and sealing the lead wire to the insulator.
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Accused Products
Abstract
A hermetic, leak-proof, corrosion resistant electrical feedthrough especially for use with implantable pulse generators. The feedthrough includes a titanium or niobium ferrule, an alumina insulator with a niobium braze area thereon positioned within the ferrule and sealed to the ferrule by a braze of gold at the braze area, electrical lead wires of niobium, tantalum, tungsten, molybdenum or alloys thereof extending through corresponding openings in the insulator, and a body of fusible glass joining and sealing each lead wire to the insulator.
87 Citations
9 Claims
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1. An improved hermetic, leak-proof, corrosion resistant electrical feedthrough, particularly adaptable to miniaturization and multi-pin construction and to IPG use, the feedthrough having substantially matched-expansion/compression joints and comprising:
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at least one electrical lead wire consisting essentially of a metal or alloy selected from the group consisting of niobium, tantalum, tungsten, molybdenum and alloys thereof; an alumina insulator positioned around a portion of the lead wire intermediate the ends thereof, the insulator including a niobium coated braze area electrically remote from the lead wire; a ferrule consisting essentially of titanium or niobium positioned around the niobium area of the alumina insulator for receiving same in sealing relationship, a braze consisting essentially of gold joining and sealing the ferrule to the insulator in the area of the niobium coating thereon, and a body of fusible glass joining and sealing the lead wire to the insulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification
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- Resources
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Current AssigneeMedtronic Incorporated (Medtronic Plc)
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Original AssigneeMedtronic Incorporated (Medtronic Plc)
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InventorsLessar, Joseph F., Taylor, William J., Weiss, Douglas
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Primary Examiner(s)Askin, Laramie E.
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Application NumberUS07/395,484Time in Patent Office326 DaysField of Search174/50.61, 174/152 GM, 128/419 P, 403/28, 403/29, 403/30, 403/179, 403/272, 429/181US Class Current174/152.0GMCPC Class CodesH01B 17/305 by embedding in glass or ce...
