Atrial capture test for an active implantable medical device
First Claim
1. An active implantable medical device of the cardiac pacemaker, resynchronization, cardioversion and/or defibrillation type, comprising:
- means for producing low energy atrial stimulation pulses (P) to be applied to an electrode implanted on the atrial cavity of a patient; and
means for detecting an occurrence of an atrial contraction after the application of an atrial stimulation pulse P, said means comprising;
an acceleration sensor having an endocardiac acceleration output (EA) signal representative of movements produced by the contractions of the atrial cavity;
means for analyzing the EA signal to recognize and isolate in the EA signal an EA4 component corresponding to a fourth peak of endocardiac acceleration associated to the atrial activity, including means for determining the presence or absence of said EA4 component, the presence of said EA4 component being representative of an atrial capture and the absence of said EA4 component being representative of an atrial loss of capture; and
means for quantifying a parameter of the EA signal within at least one analysis time window, wherein the at least one analysis time window is triggered to begin at or after the moment of application of the atrial stimulation pulse (P), and terminate before a second specific event, and the quantified parameter is representative of energy of the EA signal over the duration of the at least one analysis time window.
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Accused Products
Abstract
An active implantable medical device that is able to perform an atrial capture test. The device includes circuits for delivering atrial stimulation pulses, and testing atrial capture, namely to detect the occurrence of an atrial contraction after the application of an atrial stimulation pulse. An acceleration sensor is used to deliver an EA signal representative of the movements produced by the contractions of the atrial cavity. The EA signal is analyzed to recognize and isolate in this EA signal a component EA4 corresponding to the fourth endocardiac acceleration peak (PEA4) associated with the atrial activity. The presence or absence of this component EA4 is used to define the atrial capture or loss of capture. The signal analysis preferably quantifies an EA parameter (T, T+D), such as the energy of the EA signal within analysis time windows, each having duration D, of successive analysis (W1 . . . Wn) triggered after the atrial stimulation (P) and ending before a ventricular detection or stimulation.
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Citations
9 Claims
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1. An active implantable medical device of the cardiac pacemaker, resynchronization, cardioversion and/or defibrillation type, comprising:
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means for producing low energy atrial stimulation pulses (P) to be applied to an electrode implanted on the atrial cavity of a patient; and means for detecting an occurrence of an atrial contraction after the application of an atrial stimulation pulse P, said means comprising; an acceleration sensor having an endocardiac acceleration output (EA) signal representative of movements produced by the contractions of the atrial cavity; means for analyzing the EA signal to recognize and isolate in the EA signal an EA4 component corresponding to a fourth peak of endocardiac acceleration associated to the atrial activity, including means for determining the presence or absence of said EA4 component, the presence of said EA4 component being representative of an atrial capture and the absence of said EA4 component being representative of an atrial loss of capture; and means for quantifying a parameter of the EA signal within at least one analysis time window, wherein the at least one analysis time window is triggered to begin at or after the moment of application of the atrial stimulation pulse (P), and terminate before a second specific event, and the quantified parameter is representative of energy of the EA signal over the duration of the at least one analysis time window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification