Methods and devices for identifying overdetection of cardiac signals
First Claim
1. An implantable cardiac system (ICS), the ICS comprising operational circuitry coupled to a plurality of implantable electrodes for sensing electric signals, the operational circuitry comprising a controller coupled to memory having an instruction set configuring the ICS to perform a method of cardiac signal analysis comprising:
- sensing signals from the electrodes;
detecting events in the sensed signals;
applying event and feature/proximity analysis rules to the detected events to identify overdetection of cardiac signals; and
identifying overdetection of cardiac signal and performing ameliorative action in response to the identified overdetection;
wherein the operational circuitry is configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;
identifying a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];
measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;
measuring a second interval from the late peak of detection [n−
2] to the early peak of detection [n−
1] and comparing the second interval to a t2 threshold; and
when the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−
1] as an overdetected event.
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Accused Products
Abstract
Methods, systems, and devices for signal analysis in an implanted cardiac monitoring and treatment device such as an implantable cardioverter defibrillator. In illustrative examples, sensed data including detected events is analyzed to identify likely overdetection of cardiac events. In some illustrative examples, when overdetection is identified, data may be modified to correct for overdetection, to reduce the impact of overdetection, or to ignore overdetected data.
256 Citations
27 Claims
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1. An implantable cardiac system (ICS), the ICS comprising operational circuitry coupled to a plurality of implantable electrodes for sensing electric signals, the operational circuitry comprising a controller coupled to memory having an instruction set configuring the ICS to perform a method of cardiac signal analysis comprising:
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sensing signals from the electrodes; detecting events in the sensed signals; applying event and feature/proximity analysis rules to the detected events to identify overdetection of cardiac signals; and identifying overdetection of cardiac signal and performing ameliorative action in response to the identified overdetection; wherein the operational circuitry is configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;measuring a second interval from the late peak of detection [n−
2] to the early peak of detection [n−
1] and comparing the second interval to a t2 threshold; andwhen the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (2, 3, 4)
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5. An implantable cardiac system (ICS), the ICS comprising operational circuitry coupled to a plurality of implantable electrodes for sensing electric signals, the operational circuitry comprising a controller coupled to memory having an instruction set configuring the ICS to perform a method of cardiac signal analysis comprising:
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sensing signals from the electrodes; detecting events in the sensed signals; applying event and feature/proximity analysis rules to the detected events to identify overdetection of cardiac signals; and identifying overdetection of cardiac signal and performing ameliorative action in response to the identified overdetection; wherein the operational circuitry is configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying an early peak and a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;comparing the early peak of the [n−
2] detection to the early peak of the [n−
1] detection and determining whether the two early peaks alternate polarities; andwhen the first interval is less than the t1 threshold and the early peaks of the [n−
2] and [n−
1] alternate polarities, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (6, 7, 8)
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9. An implantable cardiac system (ICS), the ICS comprising operational circuitry coupled to a plurality of implantable electrodes for sensing electric signals, the operational circuitry comprising a controller coupled to memory having an instruction set configuring the ICS to perform a method of cardiac signal analysis comprising:
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sensing signals from the electrodes; detecting events in the sensed signals; applying event and feature/proximity analysis rules to the detected events to identify overdetection of cardiac signals; and identifying overdetection of cardiac signal and performing ameliorative action in response to the identified overdetection; wherein the operational circuitry is configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying an early peak and a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;measuring a second interval from the late peak of detection [n−
2] to the early peak of detection [n−
1] and comparing the second interval to a t2 threshold;comparing the early peak of the [n−
2] detection to the early peak of the [n−
1] detection and determining whether the two early peaks alternate polarities; and
;a) when the first interval is less than the t1 threshold and the early peaks of the [n−
2] and [n−
1] alternate polarities, identifying detection [n−
1] as an overdetected event; andb) when the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (10, 11, 12)
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13. An implantable cardiac system (ICS), comprising:
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means for sensing signals from an implanted location; means for detecting events in sensed signals; means for applying event and feature/proximity analysis rules to detected events to identify overdetection of cardiac signals; and means for ameliorating overdetection of cardiac signals; wherein the means for applying event and feature/proximity analysis rules includes a controller configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;measuring a second interval from the late peak of detection [n−
2] to the early peak of detection [n−
1] and comparing the second interval to a t2 threshold; andwhen the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (14, 15, 16, 17)
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18. An implantable cardiac system (ICS), comprising:
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means for sensing signals from an implanted location; means for detecting events in sensed signals; means for applying event and feature/proximity analysis rules to detected events to identify overdetection of cardiac signals; and means for ameliorating overdetection of cardiac signals. wherein the means for applying event and feature/proximity analysis rules includes a controller configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying an early peak and a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;comparing the early peak of the [n−
2] detection to the early peak of the [n−
1] detection and determining whether the two early peaks alternate polarities;when the first interval is less than the t1 threshold and the early peaks of the [n−
2] and [n−
1] alternate polarities, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (19, 20, 21, 22)
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23. An implantable cardiac system (ICS), comprising:
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means for sensing signals from an implanted location; means for detecting events in sensed signals; means for applying event and feature/proximity analysis rules to detected events to identify overdetection of cardiac signals; and means for ameliorating overdetection of cardiac signals, wherein the means for applying event and feature/proximity analysis rules includes a controller configured to apply the event and feature/proximity analysis rules across three detected events ([n−
2], [n−
1], [n]) as follows;identifying an early peak and a late peak in detection [n−
2], identifying an early peak and a late peak in detection [n−
1] and identifying a detection time for event [n];measuring a first interval from the late peak of detection [n−
1] to the detection time of event [n] and comparing the first interval to a t1 threshold;measuring a second interval from the late peak of detection [n−
2] to the early peak of detection [n−
1] and comparing the second interval to a t2 threshold;comparing the early peak of the [n−
2] detection to the early peak of the [n−
1] detection and determining whether the two early peaks alternate polarities; and
;a) when the first interval is less than the t1 threshold and the early peaks of the [n−
2] and [n−
1] alternate polarities, identifying detection [n−
1] as an overdetected event; andb) when the first interval is less than the t1 threshold and the second interval is less than the t2 threshold, identifying detection [n−
1] as an overdetected event. - View Dependent Claims (24, 25, 26, 27)
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Specification