# US 10,770,879 B2 · Welded feedthrough

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- Number: US 10,770,879 B2
- Document ID: US10770879B2
- Status: Granted
- Kind: B2
- Application number: 16/527,793
- Filed: 2019-07-31
- Published: 2019-11-21
- Granted: 2020-09-08
- Earliest claimed: 2013-03-14
- Assignees: Heraeus Deutschland GmbH & Co. KG
- Applicants: Heraeus Deutschland GmbH & Co. KG
- Inventors: Jacob Markham; Ulrich Hausch; Goran Pavlovic
- Web page: https://patentgrep.com/patent/US10770879B2

## CPC

- H02G 3/22: Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
- A61N 1/3754: {Feedthroughs}
- B23K 26/20: Bonding (soldering by means of radiant energy B23K1/005)
- B23K 26/206: {Laser sealing}
- B23K 26/24: Seam welding
- B23K 26/26: of rectilinear seams
- B23K 2103/08: Non-ferrous metals or alloys
- B23K 2103/14: Titanium or alloys thereof
- B23K 2103/18: Dissimilar materials
- B23K 2103/26: {Alloys of Nickel and Cobalt and Chromium}
- B23K 2103/52: {Ceramics}
- Y10T 29/49227: Insulator making
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

One aspect is a feedthrough for a medical implantable device including a ferrule having a metal that is configured to be welded to a case of the implantable device. The ferrule substantially surrounds an insulator and shares an interface therewith, the insulator having a glass or ceramic material. Conductive elements are formed through the insulator providing an electrically conductive path through the insulator. There is no braze or solder at the interface between the ferrule and the insulator and that there is no braze or solder adjacent the conductive elements.

## Claims

### Claim 1

A feedthrough for a medical implantable device comprising:
a ferrule comprising a metal that is configured to be welded to a case of the implantable device;
an insulator at least partially surrounded by the ferrule and sharing an interface therewith,
the insulator comprising a glass or ceramic material that is characterized by the absence of any material that will flow when heated to a temperature between 1,300 and 1,600 degrees C. at the interface between the insulator and case;
conductive elements formed through the insulator providing an electrically conductive path through the insulator;
characterized in that there is no braze or solder at the interface between the ferrule and the insulator and that there is no braze or solder adjacent the conductive elements; and
wherein the ferrule is configured with an inner edge that is tapered and the insulator is configured with an outer edge that is tapered to match the inner edge of the ferule,
the taper of each at an angle of 5 to 15 degrees relative to a line running perpendicular to a top surface of the feedthrough.

### Claim 2 (depends on 1)

The feedthrough of claim 1, wherein the ferrule comprises one of a group comprising niobium, titanium, titanium alloy, molybdenum, cobalt, zirconium, chromium and platinum and the insulator comprises aluminum oxide.

### Claim 3 (depends on 1)

The feedthrough of claim 1, wherein the conductive elements comprise a cermet.

### Claim 4 (depends on 3)

The feedthrough of claim 3, wherein the conducting elements comprising cermet are provided in the insulator such that they do not extend past a surface of the insulator.

### Claim 5 (depends on 1)

The feedthrough of claim 1, wherein the distance between the ferrule and the insulator along the interface is no larger than 25 microns.

### Claim 6 (depends on 1)

The feedthrough of claim 1, wherein the conductive elements, the insulator, the ferrule and any interface between them are free of braze and solder or other material that will flow when heated to a temperature between 1,300 and 1,600 degrees C.