US 10,376,703 B2
3D printed ceramic to metal assemblies for electric feedthroughs in implantable medical devices
Dominik Hammerer, Innsbruck (AT); and Janika Boltz, Innsbruck (AT)
Assigned to MED-EL Elektromedizinische Geraete GmbH, Innsbruck (AT)
Filed by MED-EL Elektromedizinische Geraete GmbH, Innsbruck (AT)
Filed on May 19, 2016, as Appl. No. 15/158,646.
Claims priority of provisional application 62/164,017, filed on May 20, 2015.
Prior Publication US 2016/0343478 A1, Nov. 24, 2016
Int. Cl. H01B 17/30 (2006.01); A61N 1/375 (2006.01); H01B 3/12 (2006.01); A61N 1/05 (2006.01); A61N 1/36 (2006.01)
CPC A61N 1/3754 (2013.01) [H01B 3/12 (2013.01); A61N 1/0541 (2013.01); A61N 1/36036 (2017.08)] 7 Claims
OG exemplary drawing
 
1. A method of producing an electrical feedthrough assembly for an implantable medical device, the method comprising:
providing an outer ferrule of metallic material with an outer surface hermetically sealed to an implantable device housing;
producing an inner feedthrough assembly, the producing including:
i. providing ceramic insulator material in a fluid environment to form an electrical insulator by a 3D printing process,
ii. providing metallized conductive material in a fluid environment to form one or more electrically conductive vias by the 3D printing process, the one or more electrically conductive vias embedded within and extending through the electrical insulator, wherein the one or more electrically conductive vias are arranged into a helical shape to form an inductive coil, and
iii. sintering the ceramic insulator material and the metallized conductive material so as to allow the ceramic insulator material and the metallized conductive material to intermingle and diffuse into each other to form a transition interface region, around each of the one or more conductive vias, that includes a gradual change in composition and a mechanical bond between the electrical insulator and the one or more electrically conductive vias, wherein the sintering is performed in a reducing atmosphere or an oxidizing atmosphere in order to reduce porosity in the inner feedthrough assembly;
locating the inner feedthrough assembly within the outer ferrule; and
forming a hermetic seal between the inner feedthrough assembly and the outer ferrule.