Patent US5016630A successfully refreshed from Google Patents.
US5016630A
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Heart pacemaker with hysteresis function
Assignee: Pacesetter AB
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Filing: 1989-01-30
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Granted: 1991-05-21
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Expires: 2009-01-30
Abstract
Abstract A heart pacemaker normally operates at a basic pacing rate having a basic escape interval between pacing pulses associated therewith, so that the pulses are delivered at the basic rate in the absence of a sensed, pacer inhibiting heart event. The pacemaker includes circuitry for setting a hysteresis interval, added to the basic escape interval, to form an extended escape interval in response to the sensed, pacer inhibiting heart event, with the hysteresis interval being a function of the basic escape interval length.
Inventors
- 👤 Lennart Moberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:26
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A pacemaker for stimulating a human heart in a patient comprising: means for generating stimulating pulses; means for supplying said stimulating pulses to the heart; means for sensing a heart event and inhibiting pulse generation upon the sensing of said heart event; time base means for controlling said means for generating pulses to produce a basic escape interval between pulses so that said pulses are supplied to said heart at a basic rate in the absence of said heart event; and means in said time base means for adding a hysteresis interval, calculated as a fixed percentage of said basic escape interval, to said basic escape interval to form an extended escape interval upon the sensing of said heart event.
Claim 2
Dependent Claim
120 words
A pacemaker for stimulating a human heart in a patient comprising: means for generating stimulating pulses; means for supplying said stimulating pulses to the heart; means for sensing a heart event and inhibiting pulse generation upon the sensing of said heart event; time base means for controlling said means for generating pulses to produce a basic escape interval between pulses so that said pulses are supplied to said heart at a basic rate in the absence of said heart event; and means in said time base means for adding a hysteresis interval, calculated as a fixed percentage of said basic escape interval, to said basic escape interval to form an extended escape interval upon the sensing of said heart event.
Claim 3
Dependent Claim
35 words
A pacemaker as claimed in claim 1 further comprising: means for sensing a body activity related parameter; and means for varying said basic escape interval as a function of the sensed body activity related parameter.
Claim 4
Dependent Claim
187 words
A pacemaker for stimulating a human heart in a patient comprising: means for generating stimulating pulses; means for supplying said stimulating pulses to the heart; means for sensing a heart event and inhibiting pulse generation upon the sensing of said heart event; time base means for controlling said means for generating pulses to produce a basic escape interval between pulses so that said pulses are supplied to said heart at a basic rate in the absence of said heart event, said time base means including binary into multiplier means for generating pulses at a selected rate in response to a control data word supplied thereto, and means for counting the pulses generated by said binary rate multiplier means; and p1 means in said time base means for adding a hysteresis interval, determined as a function of said basic escape interval, to said basic escape interval to form an extended escape interval upon the sensing of said heart event, said means for setting and adding a hysteresis interval including means for calculating said hysteresis interval as a percentage of the pulse count of said binary rate multiplier means.
Claim 5
Dependent Claim
187 words
A pacemaker for stimulating a human heart in a patient comprising: means for generating stimulating pulses; means for supplying said stimulating pulses to the heart; means for sensing a heart event and inhibiting pulse generation upon the sensing of said heart event; time base means for controlling said means for generating pulses to produce a basic escape interval between pulses so that said pulses are supplied to said heart at a basic rate in the absence of said heart event, said time base means including binary into multiplier means for generating pulses at a selected rate in response to a control data word supplied thereto, and means for counting the pulses generated by said binary rate multiplier means; and p1 means in said time base means for adding a hysteresis interval, determined as a function of said basic escape interval, to said basic escape interval to form an extended escape interval upon the sensing of said heart event, said means for setting and adding a hysteresis interval including means for calculating said hysteresis interval as a percentage of the pulse count of said binary rate multiplier means.
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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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |