CO-FIRED HERMETICALLY SEALED FEEDTHROUGH WITH ALUMINA SUBSTRATEAND PLATINUM FILLED VIA FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE
First Claim
1. A hermetically sealed feedthrough that is attachable to an active implantable medical device, the feedthrough comprising:
- a) an alumina substrate comprised of at least 96% alumina and having a thickness extending from a body fluid side to a device side;
b) a via hole disposed through the alumina substrate from the body fluid side to the device side;
c) a substantially closed pore and substantially pure platinum fill disposed within the via hole and extending between the body fluid side and the device side of the alumina substrate; and
d) a hermetic seal between the platinum fill and the alumina substrate,e) wherein the platinum fill forms a tortuous and mutually conformal knitline or interface between the alumina substrate and the platinum fill.
4 Assignments
0 Petitions
Accused Products
Abstract
A co-fired hermetically sealed feedthrough is attachable to an active implantable medical device. The feedthrough comprises an alumina dielectric substrate comprising at least 96 or 99% alumina. A via hole is disposed through the alumina dielectric substrate from a body fluid side to a device side. A substantially closed pore, fritless and substantially pure platinum fill is disposed within the via hole forming a platinum filled via electrically conductive between the body fluid side and the device side. A hermetic seal is between the platinum fill and the alumina dielectric substrate, wherein the hermetic seal comprises a tortuous and mutually conformal interface between the alumina dielectric substrate and the platinum fill.
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Citations
60 Claims
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1. A hermetically sealed feedthrough that is attachable to an active implantable medical device, the feedthrough comprising:
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a) an alumina substrate comprised of at least 96% alumina and having a thickness extending from a body fluid side to a device side; b) a via hole disposed through the alumina substrate from the body fluid side to the device side; c) a substantially closed pore and substantially pure platinum fill disposed within the via hole and extending between the body fluid side and the device side of the alumina substrate; and d) a hermetic seal between the platinum fill and the alumina substrate, e) wherein the platinum fill forms a tortuous and mutually conformal knitline or interface between the alumina substrate and the platinum fill. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 58, 59, 60)
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46. A hermetically sealed feedthrough that is attachable to an active implantable medical device, the feedthrough comprising:
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a) an alumina substrate comprised of at least 96% alumina and having a thickness extending from a body fluid side to a device side; b) a via hole disposed through the alumina substrate from the body fluid side to the device side; c) a substantially closed pore and substantially pure platinum fill disposed within the via hole and extending between the body fluid side and the device side of the alumina substrate; and d) a hermetic seal between the platinum fill and the alumina substrate, e) wherein the hermetic seal has a leak rate that is no greater than 1×
10−
7 std cc He/sec,f) wherein the platinum fill forms a tortuous and mutually conformal knitline or interface between the alumina substrate and the platinum fill. - View Dependent Claims (47, 48)
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49. A hermetically sealed feedthrough that is attachable to an active implantable medical device, the feedthrough comprising:
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a) an alumina substrate comprised of at least 96% alumina and having a thickness extending from a body fluid side to a device side; b) a via hole disposed through the alumina substrate from the body fluid side to the device side; c) a first substantially closed pore and substantially pure platinum fill disposed within the via hole and extending between the body fluid side and the device side of the alumina substrate, wherein the platinum fill forms a tortuous and mutually conformal knitline or interface between the alumina substrate and the platinum fill; and d) a hermetic seal between the first platinum fill and the alumina substrate, wherein the hermetic seal has a leak rate that is no greater than 1×
10−
7 std cc He/sec;e) a grounded via hole disposed through the alumina substrate from the body fluid side to the device side; f) a second substantially closed pore platinum fill disposed within the grounded via hole and extending between the body fluid side and the device side of the alumina substrate; and g) a second hermetic seal between the second platinum fill and the alumina substrate, wherein the second hermetic seal has a leak rate that is no greater than 1×
10−
7 std cc He/sec;h) at least one grounded electrode plate electrically coupled to the second grounded platinum filled via and in non-conductive relation to the first platinum filled via; and i) an outer metallization disposed on the alumina dielectric substrate and electrically connected to the plurality of grounded electrode plates. - View Dependent Claims (50, 51)
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52. A method of manufacturing a hermetically sealed feedthrough, comprising:
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a) forming a dielectric substrate comprising at least 96 percent alumina; b) forming at least one via hole extending through the dielectric substrate; c) filling the at least one via hole with a conductive fill, the conductive fill including a platinum powder and an inactive organic binder, solvent or plasticizer; d) placing the dielectric substrate and conductive fill into an air filled heating chamber; e) heating the dielectric substrate and conductive fill to a temperature of from about 400°
C. to 700°
C. and holding that temperature for a period of time that is sufficient for the inactive organic binder, solvent and plasticizer to be substantially baked out of the platinum fill;heating the dielectric substrate and platinum fill to a temperature of about 1,400°
C. to about 1,900°
C. and holding that temperature for a period of time sufficient for the conductive fill to hermetically seal to the dielectric substrate forming a monolithic structure; andg) cooling the heating chamber. - View Dependent Claims (53, 54, 55, 56, 57)
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Specification