US 11,872,405 B2
Feedthrough assembly
Brad C. Tischendorf, Minneapolis, MN (US); and Andrew J. Thom, Maple Grove, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Jun. 9, 2021, as Appl. No. 17/343,467.
Application 17/343,467 is a continuation of application No. 16/786,078, filed on Feb. 10, 2020, granted, now 11,058,883.
Claims priority of provisional application 62/806,107, filed on Feb. 15, 2019.
Prior Publication US 2021/0290964 A1, Sep. 23, 2021
Int. Cl. A61N 1/37 (2006.01); A61N 1/375 (2006.01); C03C 3/064 (2006.01); C03C 3/068 (2006.01); C03C 3/066 (2006.01); C03C 8/24 (2006.01); C03C 8/04 (2006.01); H01B 3/08 (2006.01); H01B 17/22 (2006.01); C03C 8/02 (2006.01)
CPC A61N 1/3754 (2013.01) [C03C 3/064 (2013.01); C03C 3/066 (2013.01); C03C 3/068 (2013.01); C03C 8/02 (2013.01); C03C 8/04 (2013.01); C03C 8/24 (2013.01); H01B 3/087 (2013.01); H01B 17/22 (2013.01); C03C 2205/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. 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.