US4407302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiac pacemaker electrode tip structure
Assignee: Pacesetter Inc
•
Filing: 1981-04-06
•
Granted: 1983-10-04
•
Expires: 2001-04-06
Abstract
Abstract A cardiac pacemaker electrode including an electrode tip having an external surface with a concave region formed therein to increase the pacing impedance thereof. Further, the external surface of the electrode tip is roughened, for example by abrading with a jet of glass beads projected under pressure, to increase the microsurface area of the electrode tip and to reduce the sensing impedance thereof.
Inventors
- 👤 Michael S. Hirshorn
- 👤 Loraine K. Holley
- 👤 Michael Skalsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
74 words
A pacemaker electrode having an electrode tip with an external conductive surface for contact with tissue to be stimulated, the improvement comprising means for increasing the microsurface area of said electrode tip to decrease the sensing impedance of said electrode tip, said increasing means comprising at least one roughened area formed on said external surface and at least one concave indentation formed in said external surface for contact with said tissue to be stimulated.
Claim 2
Dependent Claim
74 words
A pacemaker electrode having an electrode tip with an external conductive surface for contact with tissue to be stimulated, the improvement comprising means for increasing the microsurface area of said electrode tip to decrease the sensing impedance of said electrode tip, said increasing means comprising at least one roughened area formed on said external surface and at least one concave indentation formed in said external surface for contact with said tissue to be stimulated.
Claim 3
Dependent Claim
13 words
A pacemaker electrode as in claim 1 wherein said external surface is convex.
Claim 4
Dependent Claim
15 words
A pacemaker electrode as in claim 1 wherein said electrode tip is formed of platinum.
Claim 5
Dependent Claim
23 words
A pacemaker electrode according to claim 1, 2, or 3 wherein said roughened area is formed in a portion of said concave indentation.
Claim 6
Dependent Claim
21 words
A pacemaker electrode according to claim 1, 2, or 3 wherein said roughened area is formed outside of said concave indentation.
Claim 7
Dependent Claim
28 words
A pacemaker electrode according to claim 1, 2, or 3 wherein the area of said external surface including said concave indentation surface is approximately 6 mm 2 .
Claim 8
Dependent Claim
29 words
A pacemaker electrode according to claim 1, 2, or 3 wherein the area of said external surface including said concave indentation surface is at least 4 mm 2 .
Claim 9
Dependent Claim
21 words
A pacemaker electrode according to claim 1 wherein the area of said external surface is at least 4 mm 2 .
Claim 10
Dependent Claim
61 words
An improved pacemaker electrode for stimulating tissue in contact therewith, the electrode comprising: an electrode tip having a conductive external surface for contact with the tissue to be stimulated, and means for decreasing the sensing impedance of said electrode tip, said decreasing means comprising at least one concave indentation in said external surface for contact with the tissue to be stimulated.
Claim 11
Dependent Claim
61 words
An improved pacemaker electrode for stimulating tissue in contact therewith, the electrode comprising: an electrode tip having a conductive external surface for contact with the tissue to be stimulated, and means for decreasing the sensing impedance of said electrode tip, said decreasing means comprising at least one concave indentation in said external surface for contact with the tissue to be stimulated.
Claim 12
Dependent Claim
14 words
A pacemaker electrode as in claim 9 wherein the said external surface is convex.
Claim 13
Dependent Claim
15 words
A pacemaker electrode according to claim 9 wherein said electrode tip is formed of platinum.
Claim 14
Dependent Claim
45 words
A pacemaker electrode according to claim 9, 10, or 11 wherein said external surface includes at least one roughened portion outside of said concave indentation for increasing substantially the microsurface area of said electrode tip to further decrease the sensing impedance of said electrode tip.
Claim 15
Dependent Claim
43 words
A pacemaker electrode tip according to claim 9, 10, or 11 wherein said concave indentation thereof includes at least one roughened portion thereon to increase substantially the microsurface area of said electrode tip to further decrease the sensing impedance of said electrode tip.
Claim 16
Dependent Claim
92 words
A pacemaker electrode for electrically stimulating tissue in contact therewith, the electrode comprising: an electrode tip having a conductive convex surface for contact with the tissue to be stimulated; a concave portion formed in said convex surface to increase the sensing impedance of said electrode tip, the concave surface of said concave portion being exposed for contact with the tissue to be stimulated; and a plurality of roughened portions in said convex surface and said concave portion to increase the microsurface area of said electrode tip to decrease the sensing impedance thereof.
Claim 17
Dependent Claim
92 words
A pacemaker electrode for electrically stimulating tissue in contact therewith, the electrode comprising: an electrode tip having a conductive convex surface for contact with the tissue to be stimulated; a concave portion formed in said convex surface to increase the sensing impedance of said electrode tip, the concave surface of said concave portion being exposed for contact with the tissue to be stimulated; and a plurality of roughened portions in said convex surface and said concave portion to increase the microsurface area of said electrode tip to decrease the sensing impedance thereof.
References Cited (Backward Citations)
US3941135A
Cited
US3981309A
Cited
GB1535210A
Cited
DE2516848A1
Cited
US4280514A
Cited
GB1546107A
Cited
US4030508A
Cited
DE2613072A1
Cited
GB2040685A
Cited
GB2043453A
Cited
EP0024963A1
Cited
GB2065478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |