Patent US4708143A successfully refreshed from Google Patents.
US4708143A
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Method for controlling pacing of a heart in response to changes in stroke volume
Assignee: Pacesetter Inc
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Filing: 1986-07-14
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Granted: 1987-11-24
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Expires: 2006-07-14
Abstract
Abstract A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of: sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closings of the tricuspid valve; calculating the change in ejection time, ΔET, from determinations of ejection time; calculating changes, in stroke volume, ΔSV,; determining the required change in heart rate, ΔR, relative to the change in stroke volume, ΔSV,; and adjustng the pacing rate of a pacer relative to the required change in heart rate, ΔR.
Inventors
- 👤 Edward A. Schroeppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:52
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/03; A61B5/02; A61B5/021; A61B5/0215; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36564
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of: sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closing of the tricuspid valve; calculating the change in ejection time, ΔET, from determinations of ejection time; calculating changes in stroke volume, ΔSv,; determining the required change in heart rate, ΔR, relative to the change in stroke volume, ΔSv; and adjusting the pacing rate of a pacer relative to the required change in heart rate, ΔR.
Claim 2
Independent Claim
143 words
A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of: sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closing of the tricuspid valve; calculating the change in ejection time, ΔET, from determinations of ejection time; calculating changes in stroke volume, ΔSv,; determining the required change in heart rate, ΔR, relative to the change in stroke volume, ΔSv; and adjusting the pacing rate of a pacer relative to the required change in heart rate, ΔR.
Claim 3
Independent Claim
147 words
A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closings of the tricuspid valve; calculating the changes in ejection time, ΔET, from determinations of ejection time; calculating changes in stroke volume ΔSV from the formula: ΔSV=0.30 (ΔET)+0.63; and determining the required change in heart rate, ΔR relative to the change in stroke volume, ΔSv; adjusting the pacing rate of the pacer relative to the required change in heart rate, ΔR.
Claim 4
Independent Claim
147 words
A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closings of the tricuspid valve; calculating the changes in ejection time, ΔET, from determinations of ejection time; calculating changes in stroke volume ΔSV from the formula: ΔSV=0.30 (ΔET)+0.63; and determining the required change in heart rate, ΔR relative to the change in stroke volume, ΔSv; adjusting the pacing rate of the pacer relative to the required change in heart rate, ΔR.
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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) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |