Calculation of the atrioventricular delay for an active implantable metal device
First Claim
1. An active implantable medical device of the cardiac stimulation, resynchronization, cardioversion and/or defibrillation type, comprising:
- means for detecting spontaneous and stimulated atrial events;
means for detecting ventricular events;
means for calculating an atrio-ventricular delay AVD, said AVD starting on the detection of one of a spontaneous and a stimulated atrial event;
an acceleration sensor having an output signal that is an EA signal representative of the movements produced by the contractions of the atrial cavity;
means for analyzing the EA signal to identify and isolate in the EA signal an EA4 component corresponding to the fourth peak of endocardiac acceleration associated to the atrial activity, and means for calculating the value of the AVD based upon the EA4 component; and
means for pacing the ventrical with a low energy stimulation pulse, in response to an expiration of the calculated AVD and in the absence of a detected spontaneous ventricular event,wherein the means for calculating the value of the AVD further comprises means for determining a parameter of the EA4 component as a function of an end time of the EA4 component, and calculating the value of the AVD as a function of said determined parameter.
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Accused Products
Abstract
An active implantable medical device including circuits for calculating an atrio ventricular delay (AVD) period. The device is able to detect the atrial and ventricular events; calculate an AVD and to start the AVD on detection of a spontaneous or paced atrial event. The device is able to deliver a low energy ventricular stimulation pulse at the expiration of the AVD in the absence of a detected spontaneous ventricular event. To calculate the AVD, the device uses an acceleration sensor to deliver an endocardiac acceleration (EA) signal representative of the movements produced by the contractions of the atrial cavity; and analyzes the EA signal to identify and isolate in the EA signal a component corresponding to the fourth peak of endocardiac acceleration (PEA4) associated to the atrial activity, and to calculate the AVD based on a parameter of this component.
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Citations
16 Claims
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1. An active implantable medical device of the cardiac stimulation, resynchronization, cardioversion and/or defibrillation type, comprising:
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means for detecting spontaneous and stimulated atrial events; means for detecting ventricular events; means for calculating an atrio-ventricular delay AVD, said AVD starting on the detection of one of a spontaneous and a stimulated atrial event; an acceleration sensor having an output signal that is an EA signal representative of the movements produced by the contractions of the atrial cavity; means for analyzing the EA signal to identify and isolate in the EA signal an EA4 component corresponding to the fourth peak of endocardiac acceleration associated to the atrial activity, and means for calculating the value of the AVD based upon the EA4 component; and means for pacing the ventrical with a low energy stimulation pulse, in response to an expiration of the calculated AVD and in the absence of a detected spontaneous ventricular event, wherein the means for calculating the value of the AVD further comprises means for determining a parameter of the EA4 component as a function of an end time of the EA4 component, and calculating the value of the AVD as a function of said determined parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification