System and method for accurately detecting cardiac events using multi-threshold processing
First Claim
1. A method of detecting the time of occurrence of a cardiac event of a heart, the method comprising:
- sensing electrical activity of the heart to generate an electrogram of the heart;
applying the electrogram to an event detector having a plurality of thresholds, the electrogram having an amplitude for crossing a plurality of the thresholds;
determining a characteristic identifying feature of the electrogram at each of the plurality of threshold crossings of the electrogram;
comparing the determined characteristic identifying features to an electrogram template for each of the plurality of threshold crossings; and
identifying the time of occurrence of the cardiac event based upon the comparison.
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Accused Products
Abstract
A system and method provide precise detection of the time of occurrence of a cardiac event of a heart. The method comprises the steps of sensing electrical activity of the heart to generate an electrogram of the heart and applying the electrogram to an event detector having a plurality of spaced apart thresholds. The thresholds are selected such that the electrogram has an amplitude for crossing at least one of the thresholds. The method further comprises determining a characteristic identifying feature of the electrogram at each threshold crossing of the electrogram, comparing the determined characteristic identifying features to an electrogram template, and identifying the time of occurrence of the cardiac event based upon the comparison.
5 Citations
20 Claims
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1. A method of detecting the time of occurrence of a cardiac event of a heart, the method comprising:
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sensing electrical activity of the heart to generate an electrogram of the heart; applying the electrogram to an event detector having a plurality of thresholds, the electrogram having an amplitude for crossing a plurality of the thresholds; determining a characteristic identifying feature of the electrogram at each of the plurality of threshold crossings of the electrogram; comparing the determined characteristic identifying features to an electrogram template for each of the plurality of threshold crossings; and identifying the time of occurrence of the cardiac event based upon the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system that detects the time of occurrence of a cardiac event of a heart, the system comprising:
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a sensing circuit that senses electrical activity of the heart to generate an electrogram of the heart; an event detector that acts upon the electrogram, the event detector having a plurality of thresholds, the electrogram having an amplitude for crossing a plurality of the thresholds; and a processor that stores an electrogram template and determines a characteristic identifying feature of the electrogram at each of the plurality of threshold crossings of the electrogram, compares the determined characteristic identifying features to the electrogram template, and identifies the time of occurrence of the cardiac event based upon the comparison. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. In an implantable cardiac device, a system that detects the time of occurrence of a cardiac event of a heart comprising:
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a sensing circuit that senses electrical activity of the heart to generate an electrogram of the heart; an event detector that acts upon the electrogram, the event detector having a plurality of thresholds, the electrogram having an amplitude for crossing a plurality of the thresholds; and a processor that stores an electrogram template and determines a characteristic identifying feature of the electrogram at each of the plurality of threshold crossings of the electrogram, compares the determined characteristic identifying features to the electrogram template, and identifies the time of occurrence of the cardiac event based upon the comparison. - View Dependent Claims (19, 20)
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Specification