Adaptive waveform appraisal in an implantable cardiac system
First Claim
1. An implantable device (ID) comprising operational circuitry and a plurality of electrodes coupled to the operational circuitry to allow observation of electrical activity by the operational circuitry when the ID is implanted in a patient, wherein the operational circuitry is configured to perform a method of detecting signals comprising:
- sensing electrical activity using the electrodes;
detecting a detected event in the electrical activity;
analyzing the detected event by defining an analysis window having an analysis window duration, identifying characteristic features of the electrical activity sensed during the analysis window, and counting the characteristic features that occur during the analysis window to generate a characteristic feature count for the detected event; and
comparing the characteristic feature count to a predefined threshold and either rejecting the detected event as suspect or accepting the detected event as likely being of predetermined origin;
wherein the operational circuitry is further configured to identify a change in a sensing parameter of the system and modify the predefined threshold to account for the changed sensing parameter.
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Accused Products
Abstract
Methods and implantable devices for cardiac signal analysis. The methods and devices make use of waveform appraisal techniques to distinguish event detections into categories for suspect events and waveform appraisal passing events. When adjustments are made to the data entering analysis for waveform appraisal, the waveform appraisal thresholds applied are modified as well. For example, when the data analysis window for waveform appraisal changes in length, a waveform appraisal threshold is modified. Other changes, including changes in sensing characteristics with which waveform appraisal operates may also result in changes to the waveform appraisal threshold including changes in gain, sensing vector, activation of other devices, implantee posture and other examples which are explained.
317 Citations
20 Claims
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1. An implantable device (ID) comprising operational circuitry and a plurality of electrodes coupled to the operational circuitry to allow observation of electrical activity by the operational circuitry when the ID is implanted in a patient, wherein the operational circuitry is configured to perform a method of detecting signals comprising:
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sensing electrical activity using the electrodes; detecting a detected event in the electrical activity; analyzing the detected event by defining an analysis window having an analysis window duration, identifying characteristic features of the electrical activity sensed during the analysis window, and counting the characteristic features that occur during the analysis window to generate a characteristic feature count for the detected event; and comparing the characteristic feature count to a predefined threshold and either rejecting the detected event as suspect or accepting the detected event as likely being of predetermined origin; wherein the operational circuitry is further configured to identify a change in a sensing parameter of the system and modify the predefined threshold to account for the changed sensing parameter. - View Dependent Claims (2, 3, 4, 5)
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6. An implantable device (ID) comprising operational circuitry and a plurality of electrodes coupled to the operational circuitry to allow observation of electrical activity by the operational circuitry when the ID is implanted in a patient, wherein the operational circuitry is configured to perform a method of detecting signals comprising:
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sensing electrical activity using the electrodes; detecting a detected event in the electrical activity; analyzing the detected event by defining an analysis window having an analysis window duration, identifying characteristic features of the electrical activity sensed during the analysis window, and counting the characteristic features that occur during the analysis window to generate a characteristic feature count for the detected event; and comparing the characteristic feature count to a predefined threshold and either rejecting the detected event as suspect or accepting the detected event as likely being of predetermined origin; wherein the operational circuitry is further configured to identify a modification to a sensing characteristic and modify the predefined threshold to account for the sensing characteristic. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operation in an implantable device (ID) comprising operational circuitry and a plurality of electrodes coupled to the operational circuitry to allow observation of electrical activity by the operational circuitry when the ID is implanted in a patient, the method comprising:
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the operational circuitry sensing electrical activity using the electrodes; the operational circuitry detecting a detected event in the electrical activity; the operational circuitry analyzing the detected event by defining an analysis window having an analysis window duration, identifying characteristic features of the electrical activity sensed during the analysis window, and counting the characteristic features that occur during the analysis window to generate a characteristic feature count for the detected event; and the operational circuitry comparing the characteristic feature count to a predefined threshold and either rejecting the detected event as suspect or accepting the detected event as likely being of predetermined origin; wherein the method further comprises the operational circuitry identifying a change in a sensing parameter of the system and modifying the predefined threshold to account for the changed sensing parameter. - View Dependent Claims (17, 18, 19, 20)
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Specification