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US 11,872,405 B2Granted
Feedthrough assembly
AssigneeMedtronic, Inc.
InventorsBrad C. Tischendorf, Andrew J. Thom
Life of this patent
Estimating the term…
Abstract
A feedthrough assembly includes: a ferrule; an insulating structure; and a seal fixedly securing the insulating structure within the ferrule, the seal comprising a glass and single-phase particulate dispersed therein; wherein the glass includes: 25% to 40% B2O3; 0 to 25% CaO; 0 to 25% MgO; 0 to 25% SrO; 0 to 10% La2O3; 5% to 15% SiO2; and 10% to 20% Al2O3; wherein all percentages are mole percentages of the glass.
Claims10
A method of forming a glass hermetic seal, the method comprising:
- forming a glass preform by:
- mixing a glass with a single-phase particulate to form a mixture, the glass having a first composition comprising:
- 25% to 40% B2O3;
- 0 to 25% CaO;
- 0 to 25% MgO;
- 0 to 25% SrO;
- 0 to 10% La2O3;
- 5% to 15% SiO2;
- and 10% to 20% Al2O3
- wherein all percentages are mole percentages of the glass powder;
- forming a bulk shape from the mixture;
- and heating the bulk shape to a reflow temperature above a glass transition temperature of the glass powder,
- wherein the glass preform comprises a continuous glassy matrix having the first composition with the single-phase particulate distributed throughout the glassy matrix,
- wherein the single-phase particulate has a second composition that is different from the first composition;
- applying the glass preform between a conductive element and a substrate;
- and applying heat to the glass preform to form the glass hermetic seal between the conductive element and substrate,
- wherein the glass hermetic seal does not include a glass ceramic.
14 more elements
Dependencies are inferred from the claim text.