Patent · US10500402B2 · B2 · US

Hermetically sealed feedthrough with co-fired filled via and conductive insert for an active implantable medical device

(11) Publication number

US10500402B2

(21) Application number

15/894,239

(22) Filing date

2018-02-12

(30) Priority date

2012-01-16

(43) Publication date

2019-12-10

(45) Date of grant

2019-12-10

(51) IPC

A61N 1/05; A61N 1/375; H01G 2/10; H01G 4/35; B01J 20/34; H01R 43/00

(52) CPC

A61N Electrotherapy; magnetotherapy; radiation therapy; ultrasound therapy: 1/3754, 1/05, 1/372, 1/375, 1/37512
B22F Working metallic powder; manufacture of articles from metallic powder; making metallic powder; apparatus or devices specially adapted for metallic powder: 1/0059, 2998/10, 3/10
C22C Alloys: 29/12
H01G Capacitors; capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices of the electrolytic type: 2/103, 4/35
H01R Electrically-conductive connections; structural associations of a plurality of mutually-insulated electrical connecting elements; coupling devices; current collectors: 43/00
Y10T Technical subjects covered by former us classification: 156/1052

(73) Assignee

Greatbatch Ltd

(72) Inventors

Robert A. Stevenson; Xiaohong Tang; William C. Thiebolt; Christine A. Frysz; Keith W. Seitz; Richard L. Brendel; Thomas Marzano; Jason Woods; Dominick J. Frustaci; Steven W. Winn

(54) Title

Hermetically sealed feedthrough with co-fired filled via and conductive insert for an active implantable medical device

(57) Abstract

A hermetically sealed feedthrough for attachment to an active implantable medical device includes a dielectric substrate configured to be hermetically sealed to a ferrule or an AIMD housing. A via hole is disposed through the dielectric substrate from a body fluid side to a device side. A conductive fill is disposed within the via hole forming a filled via electrically conductive between the body fluid side and the device side. A conductive insert is at least partially disposed within the conductive fill. Then, the conductive fill and the conductive insert are co-fired with the dielectric substrate to form a hermetically sealed and electrically conductive pathway through the dielectric substrate between the body fluid side and the device side.

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Claims (18)

A dielectric substrate configured for incorporation into a hermetically sealed feedthrough, the dielectric substrate comprising: a) at least one dielectric via hole extending through the dielectric substrate to spaced apart dielectric substrate first and second end surfaces, the at least one dielectric via hole having a dielectric via hole open volume; b) a platinum fill comprising at least 80% platinum particles mixed with at least one binder, wherein the platinum fill is disposed in the dielectric via hole to thereby occupy at least 80% of the dielectric via hole open volume, c) wherein, in a pre-sintered state, the dielectric substrate has a dielectric green-state volume and the platinum fill has a platinum fill green-state volume, and d) wherein, after having been sintered, the dielectric substrate having the at least one dielectric via hole provided with the platinum fill is characterized by the platinum fill having had the binder substantially volatilized to thereby provide a sintered platinum fill volume and a sintered dielectric substrate volume, and e) wherein the platinum fill sintered volume is less than the platinum fill green-state volume, and the dielectric sintered volume is less than the dielectric green-state volume, and f) wherein the dielectric difference between the dielectric sintered- and green-state volumes is from 14% to 20% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes so that the dielectric substrate imparts a compressive force on the platinum fill to thereby provide a hermetically sealed and electrically conductive platinum pathway through the dielectric substrate between and to the dielectric substrate first and second end surfaces.
The dielectric substrate of claim 1, comprising alumina.
The dielectric substrate of claim 1, wherein the platinum fill in the green state has, by weight, a minimum of 90% platinum particles mixed with the at least one binder.
The dielectric substrate of claim 1, wherein the platinum fill in the green state has, by weight, a minimum of 95% platinum particles mixed with the at least one binder.
The dielectric substrate of claim 1, wherein the platinum fill disposed in the dielectric via hole occupies at least 90% of the dielectric via hole open volume.
The dielectric substrate of claim 1, wherein the platinum fill disposed in the dielectric via hole occupies about 99% of the dielectric via hole open volume.
The dielectric substrate of claim 1, wherein the dielectric difference between the dielectric sintered- and green-state volumes is about 16% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes.
A hermetically sealed feedthrough, comprising: a) an electrically conductive ferrule comprising a ferrule opening, wherein the ferrule is configured to be attachable to an opening in a housing of an active implantable medical device; b) a dielectric substrate at least partially residing in the ferrule opening where a gold braze hermetically seals the dielectric substrate to the ferrule, wherein at least one dielectric via hole extending through the dielectric substrate to spaced apart dielectric substrate first and second end surfaces has a dielectric via hole open volume; c) a platinum fill comprising at least 80% platinum particles mixed with at least one binder, wherein the platinum fill is disposed within the dielectric via hole to thereby occupy at least 80% of the dielectric via hole open volume, d) wherein, in a pre-sintered state, the dielectric substrate has a dielectric green-state volume and the platinum fill has a platinum fill green-state volume, and e) wherein, after having been sintered, the dielectric substrate having the at least one dielectric via hole provided with the platinum fill is characterized by the platinum fill having had the binder substantially volatilized to thereby provide a sintered platinum fill volume and a sintered dielectric substrate volume, and f) wherein the platinum fill sintered volume is less than the platinum fill green-state volume, and the dielectric sintered volume is less than the dielectric green-state volume, and g) wherein the dielectric difference between the dielectric sintered- and green-state volumes is from 14% to 20% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes so that the dielectric substrate imparts a compressive force on the platinum fill to thereby provide a hermetically sealed and electrically conductive platinum pathway through the dielectric substrate between and to the dielectric substrate first and second end surfaces.
The feedthrough of claim 8, wherein the dielectric substrate comprises at least 96 percent alumina.
The feedthrough of claim 8, wherein the platinum fill in the green state has, by weight, a minimum of 90% platinum particles mixed with the at least one binder.
The feedthrough of claim 8, wherein the platinum fill in the green state has, by weight, a minimum of 95% platinum particles mixed with the at least one binder.
The feedthrough of claim 8, wherein the platinum fill disposed in the dielectric via hole occupies at least 90% of the dielectric via hole open volume.
The feedthrough of claim 8, wherein the platinum fill disposed in the dielectric via hole occupies about 99% of the dielectric via hole open volume.
The feedthrough of claim 8, wherein the dielectric difference between the dielectric sintered- and green-state volumes is about 16% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes.
The feedthrough of claim 8, including a conductive insert at least partially disposed within the platinum fill.
The feedthrough of claim 15, wherein the conductive insert is a substantially pure platinum insert.
The feedthrough of claim 16, wherein the hermetically sealed and electrically conductive platinum pathway comprises a second hermetic seal between the platinum fill and the platinum insert.
The feedthrough of claim 8, wherein a feedthrough capacitor is disposed on the second side of the dielectric substrate, the feedthrough capacitor comprising a dielectric supporting at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate, and wherein the at least one active electrode plate is conductively connected to the platinum pathway and the at least one ground electric plate is conductively coupled to the ferrule.

Description

The present invention generally relates to implantable medical devices and hermetic terminal subassemblies. More particularly, the present invention relates to a hermetic terminal subassembly utilizing a co-fired essentially pure platinum filled via along with novel ways of making electrical connections on the body fluid and device side of the active implantable medical device (AIMD) housing.

A wide assortment of active implantable medical devices (AIMD) are presently known and in commercial use. Such devices include cardiac pacemakers, cardiac defibrillators, cardioverters, neurostimulators, and other devices for delivering and/or receiving electrical signals to/from a portion of the body. Sensing and/or stimulating leads extend from the associated implantable medical device to a distal tip electrode or electrodes in contact with body tissue.

The hermetic terminal or feedthrough of these implantable devices is considered critical. Hermetic terminals or feedthroughs are generally well-known in the art for connecting electrical signals through the housing or case of an AIMD. For example, in implantable medical devices such as cardiac pacemakers, implantable cardioverter defibrillators, and the like, a hermetic terminal comprises one or more conductive terminal pins supported by an insulative structure for feedthrough passage from the exterior to the interior of an AIMD electromagnetic shield housing. Hermetic terminals or feedthroughs for AIMDs must be biocompatible as well as resistant to degradation under applied bias current or voltage.

Citations (78)

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Record as JSON

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  "publication_number": "US10500402B2",
  "country": "US",
  "kind": "B2",
  "title": "Hermetically sealed feedthrough with co-fired filled via and conductive insert for an active implantable medical device",
  "abstract": "A hermetically sealed feedthrough for attachment to an active implantable medical device includes a dielectric substrate configured to be hermetically sealed to a ferrule or an AIMD housing. A via hole is disposed through the dielectric substrate from a body fluid side to a device side. A conductive fill is disposed within the via hole forming a filled via electrically conductive between the body fluid side and the device side. A conductive insert is at least partially disposed within the conductive fill. Then, the conductive fill and the conductive insert are co-fired with the dielectric substrate to form a hermetically sealed and electrically conductive pathway through the dielectric substrate between the body fluid side and the device side.",
  "claims": [
    "1. A dielectric substrate configured for incorporation into a hermetically sealed feedthrough, the dielectric substrate comprising: a) at least one dielectric via hole extending through the dielectric substrate to spaced apart dielectric substrate first and second end surfaces, the at least one dielectric via hole having a dielectric via hole open volume; b) a platinum fill comprising at least 80% platinum particles mixed with at least one binder, wherein the platinum fill is disposed in the dielectric via hole to thereby occupy at least 80% of the dielectric via hole open volume, c) wherein, in a pre-sintered state, the dielectric substrate has a dielectric green-state volume and the platinum fill has a platinum fill green-state volume, and d) wherein, after having been sintered, the dielectric substrate having the at least one dielectric via hole provided with the platinum fill is characterized by the platinum fill having had the binder substantially volatilized to thereby provide a sintered platinum fill volume and a sintered dielectric substrate volume, and e) wherein the platinum fill sintered volume is less than the platinum fill green-state volume, and the dielectric sintered volume is less than the dielectric green-state volume, and f) wherein the dielectric difference between the dielectric sintered- and green-state volumes is from 14% to 20% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes so that the dielectric substrate imparts a compressive force on the platinum fill to thereby provide a hermetically sealed and electrically conductive platinum pathway through the dielectric substrate between and to the dielectric substrate first and second end surfaces.",
    "2. The dielectric substrate of claim 1, comprising alumina.",
    "3. The dielectric substrate of claim 1, wherein the platinum fill in the green state has, by weight, a minimum of 90% platinum particles mixed with the at least one binder.",
    "4. The dielectric substrate of claim 1, wherein the platinum fill in the green state has, by weight, a minimum of 95% platinum particles mixed with the at least one binder.",
    "5. The dielectric substrate of claim 1, wherein the platinum fill disposed in the dielectric via hole occupies at least 90% of the dielectric via hole open volume.",
    "6. The dielectric substrate of claim 1, wherein the platinum fill disposed in the dielectric via hole occupies about 99% of the dielectric via hole open volume.",
    "7. The dielectric substrate of claim 1, wherein the dielectric difference between the dielectric sintered- and green-state volumes is about 16% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes.",
    "8. A hermetically sealed feedthrough, comprising: a) an electrically conductive ferrule comprising a ferrule opening, wherein the ferrule is configured to be attachable to an opening in a housing of an active implantable medical device; b) a dielectric substrate at least partially residing in the ferrule opening where a gold braze hermetically seals the dielectric substrate to the ferrule, wherein at least one dielectric via hole extending through the dielectric substrate to spaced apart dielectric substrate first and second end surfaces has a dielectric via hole open volume; c) a platinum fill comprising at least 80% platinum particles mixed with at least one binder, wherein the platinum fill is disposed within the dielectric via hole to thereby occupy at least 80% of the dielectric via hole open volume, d) wherein, in a pre-sintered state, the dielectric substrate has a dielectric green-state volume and the platinum fill has a platinum fill green-state volume, and e) wherein, after having been sintered, the dielectric substrate having the at least one dielectric via hole provided with the platinum fill is characterized by the platinum fill having had the binder substantially volatilized to thereby provide a sintered platinum fill volume and a sintered dielectric substrate volume, and f) wherein the platinum fill sintered volume is less than the platinum fill green-state volume, and the dielectric sintered volume is less than the dielectric green-state volume, and g) wherein the dielectric difference between the dielectric sintered- and green-state volumes is from 14% to 20% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes so that the dielectric substrate imparts a compressive force on the platinum fill to thereby provide a hermetically sealed and electrically conductive platinum pathway through the dielectric substrate between and to the dielectric substrate first and second end surfaces.",
    "9. The feedthrough of claim 8, wherein the dielectric substrate comprises at least 96 percent alumina.",
    "10. The feedthrough of claim 8, wherein the platinum fill in the green state has, by weight, a minimum of 90% platinum particles mixed with the at least one binder.",
    "11. The feedthrough of claim 8, wherein the platinum fill in the green state has, by weight, a minimum of 95% platinum particles mixed with the at least one binder.",
    "12. The feedthrough of claim 8, wherein the platinum fill disposed in the dielectric via hole occupies at least 90% of the dielectric via hole open volume.",
    "13. The feedthrough of claim 8, wherein the platinum fill disposed in the dielectric via hole occupies about 99% of the dielectric via hole open volume.",
    "14. The feedthrough of claim 8, wherein the dielectric difference between the dielectric sintered- and green-state volumes is about 16% greater than the platinum fill difference between the platinum fill sintered- and green-state volumes.",
    "15. The feedthrough of claim 8, including a conductive insert at least partially disposed within the platinum fill.",
    "16. The feedthrough of claim 15, wherein the conductive insert is a substantially pure platinum insert.",
    "17. The feedthrough of claim 16, wherein the hermetically sealed and electrically conductive platinum pathway comprises a second hermetic seal between the platinum fill and the platinum insert.",
    "18. The feedthrough of claim 8, wherein a feedthrough capacitor is disposed on the second side of the dielectric substrate, the feedthrough capacitor comprising a dielectric supporting at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate, and wherein the at least one active electrode plate is conductively connected to the platinum pathway and the at least one ground electric plate is conductively coupled to the ferrule."
  ],
  "description_excerpt": "The present invention generally relates to implantable medical devices and hermetic terminal subassemblies. More particularly, the present invention relates to a hermetic terminal subassembly utilizing a co-fired essentially pure platinum filled via along with novel ways of making electrical connections on the body fluid and device side of the active implantable medical device (AIMD) housing.\n\nA wide assortment of active implantable medical devices (AIMD) are presently known and in commercial use. Such devices include cardiac pacemakers, cardiac defibrillators, cardioverters, neurostimulators, and other devices for delivering and/or receiving electrical signals to/from a portion of the body. Sensing and/or stimulating leads extend from the associated implantable medical device to a distal tip electrode or electrodes in contact with body tissue.\n\nThe hermetic terminal or feedthrough of these implantable devices is considered critical. Hermetic terminals or feedthroughs are generally well-known in the art for connecting electrical signals through the housing or case of an AIMD. For example, in implantable medical devices such as cardiac pacemakers, implantable cardioverter defibrillators, and the like, a hermetic terminal comprises one or more conductive terminal pins supported by an insulative structure for feedthrough passage from the exterior to the interior of an AIMD electromagnetic shield housing. Hermetic terminals or feedthroughs for AIMDs must be biocompatible as well as resistant to degradation under applied bias current or voltage.",
  "cpc": [
    "A61N 1/3754",
    "A61N 1/05",
    "A61N 1/372",
    "A61N 1/375",
    "A61N 1/37512",
    "B22F 1/0059",
    "B22F 2998/10",
    "B22F 3/10",
    "C22C 29/12",
    "H01G 2/103",
    "H01G 4/35",
    "H01R 43/00",
    "Y10T 156/1052"
  ],
  "ipc": [
    "A61N 1/05",
    "A61N 1/375",
    "H01G 2/10",
    "H01G 4/35",
    "B01J 20/34",
    "H01R 43/00"
  ],
  "assignees": [
    "Greatbatch Ltd"
  ],
  "inventors": [
    "Robert A. Stevenson",
    "Xiaohong Tang",
    "William C. Thiebolt",
    "Christine A. Frysz",
    "Keith W. Seitz",
    "Richard L. Brendel",
    "Thomas Marzano",
    "Jason Woods",
    "Dominick J. Frustaci",
    "Steven W. Winn"
  ],
  "filing_date": "2018-02-12",
  "publication_date": "2019-12-10",
  "grant_date": "2019-12-10",
  "priority_date": "2012-01-16",
  "application_number": "US-201815894239-A",
  "family_id": "54354434",
  "cited_by_count": 8,
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  ]
}

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