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US 2021/0290964 A1Published application
Feedthrough assembly
AssigneeMedtronic, Inc.
InventorsBrad C. Tischendorf, Andrew J. Thom
Life of this patent
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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.
Claims23
A feedthrough assembly, comprising:
- a ferrule;
- an insulating structure;
- and
- a glass seal fixedly securing the insulating structure within the ferrule, the glass seal comprising a glass and single-phase particulate dispersed therein;
- wherein the glass comprises:
- 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.
11 more elements
8-13. (canceled)
18-20. (canceled)
A method of forming a glass seal, the method comprising:
- forming a glass preform by:
- mixing a glass powder with a single-phase particulate to form a mixture, the glass powder 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;
- 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 with the single-phase particulate distributed throughout the glass;
- applying the glass preform between a conductive element and a substrate;
- and
- applying heat to the glass preform to form a seal between the conductive element and substrate.
14 more elements
Dependencies are inferred from the claim text.