CARDIAC SIGNAL VECTOR SELECTION WITH MONOPHASIC AND BIPHASIC SHAPE CONSIDERATION
First Claim
1. A method of sensing vector selection in an implantable cardiac device, the implantable cardiac device including electrodes configured for sensing electrical signals while implanted coupled to operational circuitry configured for analyzing signals captured from the sensing electrodes, wherein the operational circuitry and electrodes are configured to define at least two sensing vectors for sensing cardiac signals, the method comprising:
- for a first sensing vector, the operational circuitry establishing each of;
an estimate of signal-to-noise ratio;
an estimate of cardiac signal amplitude; and
a measure of biphasic or monophasic nature of sensed signals; and
the operational circuitry combining the signal to noise ratio, cardiac signal amplitude and measure of biphasic or monophasic nature of sensed signals to generate a sensing quality metric for the first sensing vector.
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Accused Products
Abstract
Systems, methods and non-transient software media for performing sensing vector selection in an implantable cardiac device by assessing biphasic or monophasic characteristics of the cardiac signal in vectors under analysis. A factor associated with the biphasic or monophasic nature of the cardiac signal, as seen from a given sensing vector, can be inserted into the assessment of which of several available sensing vectors is considered “best” for purposes of cardiac signal analysis. Additional factors may be considered beyond the biphasic or monophasic nature including the quantity of turning points or inflections and amplitude variability.
24 Citations
20 Claims
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1. A method of sensing vector selection in an implantable cardiac device, the implantable cardiac device including electrodes configured for sensing electrical signals while implanted coupled to operational circuitry configured for analyzing signals captured from the sensing electrodes, wherein the operational circuitry and electrodes are configured to define at least two sensing vectors for sensing cardiac signals, the method comprising:
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for a first sensing vector, the operational circuitry establishing each of; an estimate of signal-to-noise ratio; an estimate of cardiac signal amplitude; and a measure of biphasic or monophasic nature of sensed signals; and the operational circuitry combining the signal to noise ratio, cardiac signal amplitude and measure of biphasic or monophasic nature of sensed signals to generate a sensing quality metric for the first sensing vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of sensing vector selection in an implantable cardiac device, the implantable cardiac device including electrodes configured for sensing electrical signals while implanted coupled to operational circuitry configured for analyzing signals captured from the sensing electrodes, wherein the operational circuitry and electrodes are configured to define at least two sensing vectors for sensing cardiac signals, the method comprising:
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for the first sensing vector, the operational circuitry establishing a measure of biphasic or monophasic nature of cardiac signals; the operational circuitry selecting a default sensing vector for use in the analysis of cardiac signals using at least one factor related to the measure of biphasic or monophasic nature of cardiac signals generated for the first sensing vector. - View Dependent Claims (10, 11, 12)
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13. An implantable cardiac device comprising:
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a plurality of electrodes configured for sensing electrical signals while implanted; and operational circuitry configured for analyzing signals received from the sensing electrodes, wherein the operational circuitry and electrodes are configured to define at least two sensing vectors for sensing cardiac signals and the operational circuitry is configured to perform the following; for a first sensing vector, calculating each of; an estimate of signal-to-noise ratio; an estimate of cardiac signal amplitude; and a measure of biphasic or monophasic nature of sensed signals; and combining the signal to noise ratio, cardiac signal amplitude and measure of biphasic or monophasic nature of sensed signals to generate a sensing quality metric for the first sensing vector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification