Adjusting the maximum ventricular stimulation frequency according to the hemodynamic state of the patient in an active implantable medical device
First Claim
1. An active implantable medical device, comprising means for delivering stimulation pulses to at least one site of a cardiac cavity, means for controlling a delivery frequency of the stimulation pulses, means for limiting to a maximum frequency the delivery frequency of the stimulation pulses, means for measuring an intracardiac bio-impedance, and means for adjusting the maximum frequency to a value that is a function of the measured intracardiac bio-impedance;
- means for evaluating a parameter representative of the cardiac flow based upon a signal delivered by the means for measuring the intracardiac bio-impedance;
means for controlling a predetermined variation (X %) of the delivery frequency of the stimulation pulses, means for evaluating a correlative variation (y %) of the cardiac flow, and means for adjusting the value of the maximum frequency according to the evaluated variation of the cardiac flow.
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Accused Products
Abstract
Adjusting the maximum ventricular stimulation frequency according to the hemodynamic state of the patient in an active implantable medical device. This device provides for limiting ventricular stimulation to a maximum frequency (Fmax), the rate of delivery of the stimulation pulses, measuring an intracardiac bio-impedance (Zn, Zn+1), and adjusting the maximum frequency according to the measured intracardiac bio-impedance. The adjusting process can include evaluating a parameter representative of the cardiac flow (dn, dn+1) utilizing the intracardiac signal of bio-impedance; controlling a predetermined variation (X %) of the frequency (f) of delivery of the stimulation pulses; evaluating the correlative variation (y %) of the cardiac flow; and adjusting the value of the maximum frequency (Fmax) according to the variation of the cardiac flow thus evaluated.
30 Citations
14 Claims
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1. An active implantable medical device, comprising
means for delivering stimulation pulses to at least one site of a cardiac cavity, means for controlling a delivery frequency of the stimulation pulses, means for limiting to a maximum frequency the delivery frequency of the stimulation pulses, means for measuring an intracardiac bio-impedance, and means for adjusting the maximum frequency to a value that is a function of the measured intracardiac bio-impedance; -
means for evaluating a parameter representative of the cardiac flow based upon a signal delivered by the means for measuring the intracardiac bio-impedance;
means for controlling a predetermined variation (X %) of the delivery frequency of the stimulation pulses, means for evaluating a correlative variation (y %) of the cardiac flow, and means for adjusting the value of the maximum frequency according to the evaluated variation of the cardiac flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification