Patent US4280514A successfully refreshed from Google Patents.
US4280514A
Expired / Lapsed
US
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Endocardial pacemaker electrode
Assignee: Pacesetter Inc
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Filing: 1979-07-23
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Granted: 1981-07-28
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Expires: 1999-07-23
Abstract
Abstract An endocardial pacemaker electrode is constructed of electroconductive metal inert to blood and consists of a dense rigid metal substrate and a rigid porous metal coating adhered to at least a major portion of the substrate. The electrode has a regular geometrical shape with a maximum transverse dimension of about 0.5 to 3 mm and a minimum longitudinal dimension of at least about 0.25 mm. The porous coating includes a plurality of metal particles bonded together at their points of contact with each other and with the substrate to form a network of interconnected pores substantially uniformly distributed throughout the coating. The porous coating has a porosity of about 10 to 50% by volume and a thickness of less than about 500 microns. The metal particles have a particle size selected from -100 +325 mesh, -325 +500 mesh and -500 mesh. The porous coating permits tissue formation from cellular elements in the blood stream to stabilize its position in the heart and the formation of surface tissue in those areas exposed to flowing blood prevents the formation of blood clots.
Inventors
- 👤 David C. MacGregor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/0077; A61L; A61L33/00; A61L33/02; A61L33/022; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
147 words
An endocardial heart pacemaker electrode for endocardial atrial and ventricular pacing constructed of electroconductive metal inert to blood and consisting of a dense rigid metal substrate and a rigid porous metal coating adhered to at least a major portion of said substrate, said electrode having a regular geometrical shape, a maximum transverse dimension of about 0.5 to about 3 mm and a minimum longitudinal dimension of at least about 0.25 mm, said porous coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed throughout the coating, said porous coating having a porosity of about 10 to about 50% by volume and a thickness of less than about 500 microns, said metal particles having a particle size selected from the group consisting of less than 100 mesh.
Claim 2
Dependent Claim
147 words
An endocardial heart pacemaker electrode for endocardial atrial and ventricular pacing constructed of electroconductive metal inert to blood and consisting of a dense rigid metal substrate and a rigid porous metal coating adhered to at least a major portion of said substrate, said electrode having a regular geometrical shape, a maximum transverse dimension of about 0.5 to about 3 mm and a minimum longitudinal dimension of at least about 0.25 mm, said porous coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed throughout the coating, said porous coating having a porosity of about 10 to about 50% by volume and a thickness of less than about 500 microns, said metal particles having a particle size selected from the group consisting of less than 100 mesh.
Claim 3
Dependent Claim
18 words
The electrode of claim 1 wherein said coating has a thickness of about 100 to about 300 microns.
Claim 4
Dependent Claim
18 words
The electrode of claim 2 wherein said coating has a thickness of about 20 to about 150 microns.
Claim 5
Dependent Claim
28 words
The electrode of claim 1, 2 or 3 wherein said regular geometrical shape is spherical and said transverse and longitudinal dimensions are about 0.5 to about 2 mm.
Claim 6
Dependent Claim
15 words
The electrode of claim 4 wherein said transverse and longitudinal dimensions are about 1 mm.
Claim 7
Dependent Claim
37 words
The electrode of claim 1, 2 or 3 wherein said regular geometrical shape is hollow cylindrical, said longitudinal dimension is about 1 to about 10 mm, and a wall thickness of about 0.05 to about 0.3 mm.
Claim 8
Dependent Claim
21 words
The electrode of claim 6 wherein said transverse dimension is about 2 mm and said longitudinal dimension is about 3 mm.
Claim 9
Dependent Claim
71 words
The electrode of claim 1, 2 or 3 wherein said regular geometrical shape includes an elongate cylindrical portion and an integral rounded end portion having an axially extending central portion therein filled with electrically-insulating inert polymeric material, said transverse dimension is about 1 to about 3 mm, said longitudinal dimension is about 0.25 to about 1.5 mm, and said central portion has a diameter of about 0.5 to about 1.5 mm.
Claim 10
Dependent Claim
21 words
The electrode of claim 8 wherein said transverse dimension is about 2 mm and said longitudinal dimension is about 0.5 mm.
Claim 11
Dependent Claim
148 words
An endocardial heart pacemaker electrode for endocardial atrial and ventricular pacing constructed of electroconductive metal inert to blood and consisting of a dense rigid metal substrate and a rigid porous metal coating adhered to at least a major portion of said substrate, said electrode having a regular geometrical shape including an elongate solid cylindrical portion and an integral rounded end portion, said electrode having transverse and longitudinal dimensions which are both about 1 to about 3 mm, said porous coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed throughout the coating, said porous coating having a porosity of about 10 to about 50% by volume and a thickness of less than about 500 microns, said metal particles having a particle size of less than 100 mesh.
Claim 12
Dependent Claim
148 words
An endocardial heart pacemaker electrode for endocardial atrial and ventricular pacing constructed of electroconductive metal inert to blood and consisting of a dense rigid metal substrate and a rigid porous metal coating adhered to at least a major portion of said substrate, said electrode having a regular geometrical shape including an elongate solid cylindrical portion and an integral rounded end portion, said electrode having transverse and longitudinal dimensions which are both about 1 to about 3 mm, said porous coating including a plurality of metal particles bonded together at their points of contact with each other and with said substrate to form a network of interconnected pores substantially uniformly distributed throughout the coating, said porous coating having a porosity of about 10 to about 50% by volume and a thickness of less than about 500 microns, said metal particles having a particle size of less than 100 mesh.
Claim 13
Dependent Claim
16 words
The electrode of claim 10 wherein said transverse and longitudinal dimensions are both about 2 mm.
Claim 14
Dependent Claim
19 words
The electrode of claim 1 or 8 wherein said metal particles have a particle size of -100 +325 mesh.
Claim 15
Dependent Claim
19 words
The electrode of claim 1 or 8 wherein said metal particles have a particle size of -325 +500 mesh.
Claim 16
Dependent Claim
18 words
The electrode of claim 1 or 8 wherein said metal particles have a particle size of -500 mesh.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |