Patent US4310000A successfully refreshed from Google Patents.
US4310000A
Expired / Lapsed
US
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Implantable pulse generator having separate passive sensing reference electrode
Assignee: Medtronic Inc
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Filing: 1980-01-23
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Granted: 1982-01-12
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Expires: 2000-01-23
Abstract
Abstract Passive sensing reference electrode positioned on an implantable pulse generator where the electrode electrically contacts with tissue or body fluid. The electrode configuration reduces stimulation afterpotentials due to electrode polarization and output capacitor recharge by using the passive sensing reference electrode for sensing. The passive sensing reference electrode may be located adjacent the conductor sleeve, on a surface of a hermetically sealed metallic pacemaker can, or one of the surfaces of the pacemaker can may be insulated from another surface of the pacemaker can where one half of the pacemaker can may be the passive sensing reference electrode.
Inventors
- 👤 Fredric W. Lindemans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:12
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/372; A61N1/375; A61N1/37512
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
In an implantable pulse generator having a terminal from which said implantable pulse generator both senses electrical activity and electrically stimulates body tissue via a single remotely attached electrode having a first surface area and wherein a first reference electrode is used for said stimulating, the improvement comprising: a second reference electrode electrically isolated from said first reference electrode fixedly attached to said implantable pulse generator used as a reference electrode for said sensing.
Claim 2
Dependent Claim
74 words
In an implantable pulse generator having a terminal from which said implantable pulse generator both senses electrical activity and electrically stimulates body tissue via a single remotely attached electrode having a first surface area and wherein a first reference electrode is used for said stimulating, the improvement comprising: a second reference electrode electrically isolated from said first reference electrode fixedly attached to said implantable pulse generator used as a reference electrode for said sensing.
Claim 3
Dependent Claim
18 words
The improvement according to claim 1 wherein said second reference electrode is fixedly attached to said output terminal.
Claim 4
Dependent Claim
21 words
The improvement according to claim 1 wherein said second reference electrode is located upon the surface of said implantable pulse generator.
Claim 5
Dependent Claim
31 words
The improvement according to claim 1 or claim 2 or claim 3 wherein said second reference electrode has a second surface area approximately equal to that of said first surface area.
Claim 6
Dependent Claim
72 words
A body implantable apparatus for stimulating body tissue comprising: an electrode for contacting said body tissue; a pulse generator electrically coupled to said electrode having means for evaluating signals sensed by said electrode and means for generating stimulating pulses for transferring to said electrode in response thereto; a first reference electrode coupled to said generating means; and a second reference electrode fixedly attached to said pulse generator coupled to said evaluating means.
Claim 7
Dependent Claim
72 words
A body implantable apparatus for stimulating body tissue comprising: an electrode for contacting said body tissue; a pulse generator electrically coupled to said electrode having means for evaluating signals sensed by said electrode and means for generating stimulating pulses for transferring to said electrode in response thereto; a first reference electrode coupled to said generating means; and a second reference electrode fixedly attached to said pulse generator coupled to said evaluating means.
Claim 8
Dependent Claim
40 words
Body implantable apparatus according to claim 9 wherein said pulse generator means further comprises an output terminal coupled to said electrode, said evaluating means, and said generating means and said second reference electrode is fixedly attached to said output terminal.
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) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |