Patent US4408604A successfully refreshed from Google Patents.
US4408604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous pacemaker electrode tip
Assignee: Telectronics Pty Ltd
•
Filing: 1981-04-06
•
Granted: 1983-10-11
•
Expires: 2001-04-06
Abstract
Abstract A porous cardiac pacemaker electrode comprising a concavo-convex electrode cap having a plurality of apertures therethrough and an electrode shaft having a supporting edge formed thereon to which the concave surface of the electrode cap is joined. The porous cardiac pacemaker electrode is produced by deforming a platinum plate into a concavo-convex shaped cap member, forming a plurality of selectively spaced apertures through the electrode cap member to make the electrode cap substantially porous, forming an electrode shaft having a supporting edge, and joining the supporting edge of the electrode shaft to the concave surface of the electrode cap member.
Inventors
- 👤 Michael S. Hirshorn
- 👤 Michael Skalsky
- 👤 Petrus A. VAN Berkum
- 👤 Loraine K. Holley
- 👤 David K. Money
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:14
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
An implantable porous electrode for use in a cardiac pacemaker comprising: an electrode cap having an inner surface, an outer surface, and a plurality of uniformly spaced apertures extending from said inner surface through said electrode cap to said outer surface, and adapted for tissue ingrowth when the electrode is implanted; and an electrode shaft joined to said cap with a cavity resulting between said inner surface of said cap and said shaft.
Claim 2
Dependent Claim
73 words
An implantable porous electrode for use in a cardiac pacemaker comprising: an electrode cap having an inner surface, an outer surface, and a plurality of uniformly spaced apertures extending from said inner surface through said electrode cap to said outer surface, and adapted for tissue ingrowth when the electrode is implanted; and an electrode shaft joined to said cap with a cavity resulting between said inner surface of said cap and said shaft.
Claim 3
Dependent Claim
19 words
A porous electrode according to claim 1 wherein said electrode cap and said electrode shaft are formed of platinum.
Claim 4
Dependent Claim
17 words
A porous electrode according to claim 1 wherein said electrode cap is formed in a concavo-convex shape.
Claim 5
Dependent Claim
26 words
A porous electrode according to claim 1 wherein said electrode shaft includes a supporting edge and wherein said electrode cap is joined to said supporting edge.
Claim 6
Dependent Claim
36 words
A porous electrode according to claim 1, 2, 3, or 4 wherein said apertures formed through said electrode cap are substantially circular and of uniform size with diameters in the range of 15 to 300 microns.
Claim 7
Dependent Claim
45 words
A porous electrode according to claim 5 further including a second plurality of apertures substantially oval in cross section and uniform in size, with major diameters in the range of 60 to 1200 microns and minor diameters in the range of 15 to 300 microns.
Claim 8
Dependent Claim
29 words
A porous electrode according to claim 6 further including at least one roughened area on said outer surface of said cap to increase the microsurface area of said cap.
Claim 9
Dependent Claim
51 words
A porous electrode according to claim 1, 2, 3, or 4 wherein said apertures in said cap are of a substantially oval cross section and are uniform in size, with major diameters in the range of 60 to 1200 microns and minor diameters in the range of 15 to 300 microns.
Claim 10
Dependent Claim
27 words
A porous electrode according to claim 1, 2, 3, or 4 wherein the said electrode cap has a geometric area of at least 4 mm 2 .
Claim 11
Dependent Claim
33 words
A porous electrode according to claim 1, 2, 3, or 4 further including at least one roughened area on said outer surface of said cap to increase the microsurface area of said cap.
Claim 12
Dependent Claim
21 words
A porous electrode according to claim 10 wherein said electrode cap has a geometric area greater than 4 mm 2 .
Claim 13
Dependent Claim
16 words
A porous electrode according to claim 11 having a cap diameter of at least 2 mm.
References Cited (Backward Citations)
US3754555A
Cited
US3911928A
Cited
US3911928B1
Cited
US3935864A
Cited
GB1471488A
Cited
US3935864B1
Cited
US4011861A
Cited
US3981309A
Cited
US4280514A
Cited
US4052754A
Cited
US4030508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |