Patent US4401525A successfully refreshed from Google Patents.
Patent US4301804A successfully refreshed from Google Patents.
US4301804A
Expired / Lapsed
US
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Pacemaker with Hall effect externally controlled switch
Assignee: Medtronic Inc
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Filing: 1979-11-28
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Granted: 1981-11-24
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Expires: 1999-11-28
Abstract
Abstract A body implantable cardiac pacemaker having a Hall effect switch which may be activated by a magnetic field in order to alter one or more pacemaker characteristics. A circuit in the pacemaker produces a strobe signal which is used to turn on a current flow through the Hall effect element once each pacemaker pulse cycle for a period of 25μ sec. The Hall effect element is part of an integrated circuit and is oriented in a plane parallel to the broad plane of the pacemaker.
Inventors
- 👤 David L. Thompson
- 👤 Stephen R. Duggan
- 👤 Glenn M. Roline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:49
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/37211; A61N1/37217; H; H03; H03K; H03K17/00; H03K17/51; H03K17/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A body-implantable pulse generator for providing stimulating pulses to living tissue, comprising: means for generating said stimulating pulses; a semiconductor; means for causing an electrical current flow through said semiconductor; means for detecting a voltage produced in said semiconductor in a direction perpendicular to the direction of said current flow; and means responsive to said means for detecting for controlling said means for generating in response to an externally applied magnetic field.
Claim 2
Dependent Claim
72 words
A body-implantable pulse generator for providing stimulating pulses to living tissue, comprising: means for generating said stimulating pulses; a semiconductor; means for causing an electrical current flow through said semiconductor; means for detecting a voltage produced in said semiconductor in a direction perpendicular to the direction of said current flow; and means responsive to said means for detecting for controlling said means for generating in response to an externally applied magnetic field.
Claim 3
Dependent Claim
13 words
The invention according to claim 1 wherein said semiconductor is composed of silicon.
Claim 4
Dependent Claim
48 words
The invention according to claim 1 wherein said means for causing electric current to flow through said semiconductor comprises a means for causing said current to flow for time periods that are shorter than both the time intervals between said periods and the duration of said stimulating pulse.
Claim 5
Dependent Claim
73 words
The invention according to claim 3 wherein said means for causing electric current to flow comprises: an electrical current source; means for generating a timing signal at determined time intervals for said periods of time; and means responsive to said signal and communicating with said current source for turning on current to said semiconductor upon the initiation of said signal and turning off current to said semiconductor upon the termination of said signal.
Claim 6
Dependent Claim
29 words
The invention according to claim 3 wherein said intervals between said time periods are such that said current is caused to flow at least once each stimulating pulse cycle.
Claim 7
Dependent Claim
22 words
The invention according to claim 3 wherein said time periods during which current flows through said semiconductor are less than 200 μsec.
Claim 8
Dependent Claim
18 words
The invention according to claim 1 wherein said means for detecting includes an amplifier responsive to said voltage.
Claim 9
Dependent Claim
32 words
The invention according to claim 1 wherein said means for controlling includes a digital circuit and said means for detecting further comprises a means for converting said voltage into a digital signal.
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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |