Patent US4844099A successfully refreshed from Google Patents.
US4844099A
Expired / Lapsed
US
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Porous pacemaker electrode tip using a porous substrate
Assignee: Pacesetter Inc
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Filing: 1988-05-20
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Granted: 1989-07-04
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Expires: 2008-05-20
Abstract
Abstract An implantable sitmulating lead for a cardiac pacemaker has a distal tip having a surface area adapted to physically contact heart tissue for pacing the heart tissue, sensing heart contractions and promoting tissue ingrowth. The distal tip includes a conductive electrode and a porous non-conductive substrate, which together define the surface area of the distal tip. The conductive electrode and porous substrate are provided as first and second members, although the surface area of each is adaptive to present a singular, smooth distal tip region for the electrode lead.
Inventors
- 👤 Michael Skalsky
- 👤 Zoran Milijasevic
- 👤 Akira Nakazawa
- 👤 Gerhard Gotthardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
152 words
An implantable stimulation lead for a cardiac pacemaker having a proximal end adapted to be connected to a pulse generator and a distal tip region having a surface area adapted to physically contact heart tissue for stimulating heart tissue, sensing heart contractions and promoting tissue ingrowth, said distal tip region comprising: a first member defining a conductive electrode having a conductive surface area extending substantially radially relative to the lead and forming a first portion of said distal tip surface area to stimulate heart tissue and sense heart contractions; and a second member, contiquous with said first member, defining a non-conductive porous substrate having a porous surface area extending substantially radially relative to the lead and forming a second portion of said distal tip surface area for promoting tissue ingrowth and attachment of said distal tip to heart tissue in substantially the same radially extending conductive surface area as said first portion.
Claim 2
Dependent Claim
152 words
An implantable stimulation lead for a cardiac pacemaker having a proximal end adapted to be connected to a pulse generator and a distal tip region having a surface area adapted to physically contact heart tissue for stimulating heart tissue, sensing heart contractions and promoting tissue ingrowth, said distal tip region comprising: a first member defining a conductive electrode having a conductive surface area extending substantially radially relative to the lead and forming a first portion of said distal tip surface area to stimulate heart tissue and sense heart contractions; and a second member, contiquous with said first member, defining a non-conductive porous substrate having a porous surface area extending substantially radially relative to the lead and forming a second portion of said distal tip surface area for promoting tissue ingrowth and attachment of said distal tip to heart tissue in substantially the same radially extending conductive surface area as said first portion.
Claim 3
Dependent Claim
16 words
A lead according to claim 1, wherein said porous substrate is comprised of an insulating material.
Claim 4
Dependent Claim
13 words
A lead according to claim 2, wherein said insulating material is a ceramic.
Claim 5
Dependent Claim
16 words
A lead according to claim 1, wherein said electrode is comprised of an inert metallic conductor.
Claim 6
Dependent Claim
15 words
A lead according to claim 1, wherein said electrode includes a cavity containing said substrate.
Claim 7
Dependent Claim
15 words
A lead according to claim 1, wherein said substrate includes a cavity containing said electrode.
Claim 8
Dependent Claim
11 words
A lead according to claim 1, wherein said electrode comprises platinum.
Claim 9
Dependent Claim
57 words
A lead according to claim 1, wherein said electrode further comprises a stimulating portion having a pacing surface area adapted to be in intimate contact with heart tissue and a sensing portion having a sensing surface area adapted to be in intimate contact with heart tissue, the first and second portions being electrically insulated from one another.
Claim 10
Dependent Claim
21 words
A lead according to claim 8, wherein said stimulating portion has a surface area less than about 4 mm 2 .
Claim 11
Dependent Claim
17 words
A lead according to claim 8, wherein said electrode has an enhanced microstructure for decreasing sensing impedance.
Claim 12
Dependent Claim
34 words
A lead according to claim 10 wherein said enhanced microstructure is produced by a process selected from the group consisting of glass bead blasting, electrochemical deposition or etchion beam texturing, sputter etching and deposition.
Claim 13
Dependent Claim
16 words
A lead according to claim 1, wherein said electrode has a surface having an enhanced microstructure.
Claim 14
Dependent Claim
31 words
A lead according to claim 1, further comprising means disposed in said tip region for eluting a bioactive agent into heart tissue adjacent said distal tip region to reduce inflammation response.
Claim 15
Dependent Claim
16 words
A lead according to claim 13, wherein said eluting means are disposed within said porous substrate.
Claim 16
Dependent Claim
35 words
A lead according to claim 13, wherein said eluting means comprises a bioactive agent dispersed in said porous substrate arranged to diffuse out of said porous substrate into the heart tissue at a predetermined rate.
Claim 17
Dependent Claim
35 words
A lead according to claim 1, wherein said porous substrate is comprised of a material selected from the group consisting of alumina, silicon nitride, barium titanate, partially stabilized zirconia, polypropylene, polyethylene, silicone rubber, and polyurethane.
Claim 18
Dependent Claim
38 words
A lead according to claim 1, wherein said electrode comprises a plurality of wires passing through said porous substrate and having ends exposed on the surface of said substrate, said exposed ends collectively defining said conductive surface area.
Claim 19
Dependent Claim
49 words
A lead according to claim 1, wherein said lead further comprises: a hollow insulation molding having a central passage; a helical conductor disposed in said central passage; and a crimp tube attaching said electrode and said porous substrate to said molding and electrically coupling said conductor and said electrode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |