Detection of a risk of a fusion situation in an active implantable medical device
First Claim
1. An active implantable medical device, in particular a pacemaker, defibrillator, cardiovertor or a multisite device, comprising:
- means for detecting atrial events;
means for detecting ventricular events;
means for delivering an atrial stimulation;
means for delivering a ventricular stimulation, said means being able to deliver a ventricular stimulation pulse (V) after a programmed atrio-ventricular delay (AVD) following a detected atrial event and in the absence of detected ventricular event within said AVD,; and
means for detecting a fusion situation, said fusion situation detecting means being able to;
analyze a sequence of successive cardiac cycles by modifying the AVD from a first cardiac cycle to a following cardiac cycle, and detect the presence or the absence of a spontaneous ventricular event occurring inside the modified AVD; and
means for determining an existence of a risk of fusion response to a detected a spontaneous ventricular event during at least one of the cardiac cycles of the sequence.
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Accused Products
Abstract
An active implantable medical device, in particular a pacemaker, defibrillator, cardiovertor, or a multisite device including detection of a risks of a fusion situation. This device is of the double chamber type, and it detects atrial and ventricular events, provides atrial and ventricular stimulation, and delivers a ventricular stimulation pulse after expiration a programmed atrio-ventricular delay (AVD) following the detection of an atrial event (P, A), and in the absence of detection of a ventricular spontaneous event (R) within the AVD. A fusion situation is detected based on an analysis of a sequence of successive cardiac cycles for which the atrio-ventricular delay is modified from one cycle to the next (AVD, AVD+31, AVD+63). The presence or the absence of a ventricular spontaneous event (R) occurring inside the atrio-ventricular delay thus modified is determined, and the existence of a risk of fusion is determined in the event of the occurrence of a spontaneous ventricular event during at least one of the cardiac cycles of the sequence. The detected risk of fusion can b e used to control the operation of implant.
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Citations
6 Claims
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1. An active implantable medical device, in particular a pacemaker, defibrillator, cardiovertor or a multisite device, comprising:
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means for detecting atrial events;
means for detecting ventricular events;
means for delivering an atrial stimulation;
means for delivering a ventricular stimulation, said means being able to deliver a ventricular stimulation pulse (V) after a programmed atrio-ventricular delay (AVD) following a detected atrial event and in the absence of detected ventricular event within said AVD,; and
means for detecting a fusion situation, said fusion situation detecting means being able to;
analyze a sequence of successive cardiac cycles by modifying the AVD from a first cardiac cycle to a following cardiac cycle, and detect the presence or the absence of a spontaneous ventricular event occurring inside the modified AVD; and
means for determining an existence of a risk of fusion response to a detected a spontaneous ventricular event during at least one of the cardiac cycles of the sequence. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification