EP0474958A2
Expired / Lapsed
EP
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Cardiac electrotherapy system
Assignee: Individual
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Filing: 1991-03-22
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Granted: —
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Expires: 2011-03-22
Abstract
Abstract In a cardiac electrotherapy system comprising a blood flow velocity measurement cardiac pacing lead, means for ventricular pacing synchronous with atrial contractions and means fo a rate responsive pacing, pacing is controlled by means of processing of the diastolic filling waveform of blood flow through a cardiac valve.
Inventors
- 👤 Bozidar Ferek-Petric
- 👤 Branco Dr. Breyer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 00:10
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/06; A61B8/12; A61B8/44; A61B8/4444; A61B8/445; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36528; A61N1/36571
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A cardiac electrotherapy system comprising a blood flow velocity measurement cardiac pacing lead, electronic circuitry for cardiac electrotherapy and electronic circuitry for blood flow velocity measurement, timing and processing of the velocity data, said system comprising means for a ventricular pacing synchronous with atrial contractions with the use of a single said lead and means for a rate responsive pacing, wherein said means are controlled by means of processing of the diastolic filling waveform of blood flow through a cardiac valve or along a blood vessel.
Claim 2
Dependent Claim
86 words
A cardiac electrotherapy system comprising a blood flow velocity measurement cardiac pacing lead, electronic circuitry for cardiac electrotherapy and electronic circuitry for blood flow velocity measurement, timing and processing of the velocity data, said system comprising means for a ventricular pacing synchronous with atrial contractions with the use of a single said lead and means for a rate responsive pacing, wherein said means are controlled by means of processing of the diastolic filling waveform of blood flow through a cardiac valve or along a blood vessel.
Claim 3
Dependent Claim
36 words
The cardiac electrotherapy system according to claim 1 comprising means for measurement of the blood velocity during determined time interval synchronized with the ventricular electrical activity, said interval occurring with a determined delay after ventricular activity.
Claim 4
Dependent Claim
48 words
The cardiac electrotherapy system according to claim 1 or 2, comprising means for discrimination between early diastolic filling wave (31) and atrial filling wave (33, 34), as well as means for measurement of peak velocities (E, A) of both waves and calculation of time integrals of both waves.
Claim 5
Dependent Claim
33 words
The cardiac electrotherapy system according to claim 3, comprising means for ventricular pacing (36) synchronous with atrial filling wave (34) detected by said circuitry, whereby ventricular pacing maintains the physiologic atrio- ventricular delay.
Claim 6
Dependent Claim
38 words
The cardiac electrotherapy system according to claim 3 or 4, comprising means for calculation of ratio of the peak velocities (E, A) of said filling waves and calculation of ratio of the time integrals of said filling waves.
Claim 7
Dependent Claim
65 words
The cardiac electrotherapy system according to claim 5, comprising means for beat to beat comparison of said ratios, and means for detection of consecutive decrease of said ratios indicating the high rate induced ischemia, as well as means for successive decrease of ventricular pacing rate in the case of high rate ischemia in such a way as to prevent the high rate induced cardiac ischemia.
Claim 8
Dependent Claim
62 words
The cardiac electrotherapy system according to any of claims 1 to 6, comprising means for detection of atrial fibrillation i.e. the disappearance of said atrial filling wave (33, 34) as well as means to maintain the rate responsive ventricular pacing while the atrial fibrillation is sustained, and means to revert to synchronous ventricular pacing upon the occurrence of said atrial filling wave.
Claim 9
Dependent Claim
59 words
The cardiac electrotherapy system according to any of claims 3 to 7, comprising means for measurement of the time interval (QE) between the ventricular pacing impulse (43) and the said early diastolic wave (46), said interval being the sensor for rate-responsive pacing in such a way that the pacing rate increases whenever the said interval decreases and vice versa.
Claim 10
Dependent Claim
50 words
The cardiac electrotherapy system according to claims 3 to 7, comprising means for measurement of the time duration (RFP) of said early diastolic wave (42), said duration being the sensor for rate-responsive pacing in such a way that the pacing rate increases whenever the said duration decreases and vice versa.
Claim 11
Dependent Claim
56 words
The cardiac electrotherapy system according to any of claims 3 to 7, comprising means for measurement of the first derivative (dE/dt) at the onset of said early diastolic wave (42), said derivative being the sensor for rate-responsive pacing in such a way as that the pacing rate increases whenever the said derivative increases and vice versa.
Claim 12
Dependent Claim
46 words
The cardiac electrotherapy system according to any of claims 3 to 7, wherein said peak velocities (E, A) are sensors for rate-responsive pacing in such a way as that the pacing rate increases whenever either of the said measured diastolic filling velocities increase and vice versa.
Claim 13
Dependent Claim
45 words
The cardiac electrotherapy system according to any of claims 3 to 7, comprising means for rate responsive pacing in such a way as to measure and calculate the rapid filling fraction and to increase the pacing frequency whenever the said fraction decreases and vice versa.
Claim 14
Dependent Claim
51 words
The cardiac electrotherapy system according to any of claims 3 to 12, comprising means for detection of missing ventricular contractions i.e. the disappearance of said early diastolic waves (31, 42), and means to discriminate if missing contractions are caused by the loss of capture or by the ventricular fibrillation or tachycardia.
Claim 15
Dependent Claim
49 words
The cardiac electrotherapy system according to any of claims 3 to 13, comprising means for detection of sudden decrease of said measured peak velocity (Ep) of the said early diastolic wave (42, 46) in single beat, said sudden decrease indicating that said single beat is the ventricular premature beat.
Claim 16
Dependent Claim
47 words
The cardiac electrotherapy system according to claim 3, comprising means for detection of sudden decrease of said measured peak velocity (Ep) of the said early diastolic waves (42, 46) in series of heart beats, said sudden decrease indicating that said series of beats is the ventricular tachycardia.
References Cited (Backward Citations)
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