EP0310024A2
Expired / Lapsed
EP
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Ventilation controlled rate responsive cardiac pacemaker
Assignee: Individual
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Filing: 1988-09-28
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Granted: —
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Expires: 2008-09-28
Abstract
Abstract The rate of pacing pulses in a rate responsive pacemaker is controlled from data representing respiration characteristics in a patient detected by intracardiac impedance measurements for more reliable control. Improved respiratory activity signals reducing the unwanted effects of the pulmonary impedance changes are obtained by measuring impedance strictly within the heart. The intracardiac impedance measurements are filtered through a low pass filter (19) to isolate the ventilation activity where amplitude is related to the tidal volume. Nonlinearities of this amplitude signal related to the physiological activity of a patient are found to be related inversely to the respiratory rate, and are accordingly corrected to provide control signals faithfully representing the true ventilatory tidal volume. Thus, ventilation signals representing tidal volume become a reliable factor for use in pacing pulse rate control.
Inventors
- 👤 Eckhard Dr. Alt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 11:20
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/365; A61N1/36514; A61N1/36521; A61N1/36571
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
Heart measurement instrumentation comprising in combination, measurement means for producing a signal responsive to intracardiac pressure and volume of a patient, processing means for the measurement signal including means for isolating ventilatory function signals displaying variable amplitude and rate related to respiratory activity of the patient, and tidal volume detection means for processing the amplitude of the ventilatory function signals as a function of the rate to produce a corrected amplitude reflecting the true ventilatory tidal volume of the patient over a wide range of patient activity.
Claim 2
Dependent Claim
87 words
Heart measurement instrumentation comprising in combination, measurement means for producing a signal responsive to intracardiac pressure and volume of a patient, processing means for the measurement signal including means for isolating ventilatory function signals displaying variable amplitude and rate related to respiratory activity of the patient, and tidal volume detection means for processing the amplitude of the ventilatory function signals as a function of the rate to produce a corrected amplitude reflecting the true ventilatory tidal volume of the patient over a wide range of patient activity.
Claim 3
Dependent Claim
54 words
Instrumentation as defined in Claim 1 further comprising: pulse generator means for generating heart pacing pulses, electrode means located in the right heart for receiving the pacing pulses, and pacer rate control means for controllably changing the rate of the heart pacing pulses in response to said corrected amplitude reflecting true ventilatory tidal volume.
Claim 4
Dependent Claim
24 words
Instrumentation as defined in Claim 2, wherein said measuring means further comprises: impedance measuring means responsive to intracardial impedance presented to said electrode means.
Claim 5
Dependent Claim
64 words
Instrumentation as defined in Claim 3 further comprising: common conveyanced means for transmitting the pacing signals to the electrode and receiving the measurement signals from the electrode, and means for preventing interference between measurement signals and pacing signals comprising means for inducing impedance measurements with periodic electric signals conveyed to the electrode of low enough energy that they are unable to pace the heart.
Claim 6
Dependent Claim
23 words
Instrumentation as defined in Claim 4 further comprising: low pass filter means for processing the measurement signals for isolating said ventilatory function signals.
Claim 7
Dependent Claim
34 words
The instrumentation defined in Claim 1 further comprising: means implanted in a patient's body for continually monitoring and analyzing intracardiac activity and isolating therefrom by means of a low frequency filter respiratory physiological variables.
Claim 8
Independent Claim
107 words
The method of controlling heart pacing rate of a patient in pacemaker systems, comprising the steps of: implanting an electrode in the patient's right heart, providing periodic heart pacing pulses to the electrode, sensing cardiac activity by monitoring intracardiac parameters presented to said electrode, deriving from said cardiac activity a set of ventilatory signals representative of variable respiratory activity of the patient, processing the ventilatory signals to derive subsignals representing respiratory rate and tidal volume, modifying the tidal volume subsignal as a function of the respiratory rate subsignal to derive a pulse rate control algorithm, and controlling the pacing rate as a function of said control algorithm.
Claim 9
Independent Claim
107 words
The method of controlling heart pacing rate of a patient in pacemaker systems, comprising the steps of: implanting an electrode in the patient's right heart, providing periodic heart pacing pulses to the electrode, sensing cardiac activity by monitoring intracardiac parameters presented to said electrode, deriving from said cardiac activity a set of ventilatory signals representative of variable respiratory activity of the patient, processing the ventilatory signals to derive subsignals representing respiratory rate and tidal volume, modifying the tidal volume subsignal as a function of the respiratory rate subsignal to derive a pulse rate control algorithm, and controlling the pacing rate as a function of said control algorithm.
Claim 10
Independent Claim
48 words
The method of deriving tidal volume signals from intracardiac measurements reflecting volume and pressure, comprising the steps of: separating from said measurements separate ventilatory signals relating to a patient's tidal volume and respiratory rate, and deriving a corrected tidal volume signal as a function of the intracardiac measurements.
Claim 11
Independent Claim
48 words
The method of deriving tidal volume signals from intracardiac measurements reflecting volume and pressure, comprising the steps of: separating from said measurements separate ventilatory signals relating to a patient's tidal volume and respiratory rate, and deriving a corrected tidal volume signal as a function of the intracardiac measurements.
Claim 12
Dependent Claim
15 words
The method of Claim 8 wherein the function of intracardiac measurements is the respiratory rate.
References Cited (Backward Citations)
No citation records indexed.
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