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US 10,702,167 B2Granted
Method to trigger storage of onset of physiologic condition in an implantable device
AssigneeCardiac Pacemakers, Inc.
InventorsDeepa Mahajan, David L. Perschbacher, Arjun D. Sharma
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Abstract
An apparatus includes a sensing circuit configured to generate a sensed physiological signal that includes physiological information of a subject, a detection circuit, and a control circuit. The detection circuit detects a physiological condition of a subject using the physiological signal. The control circuit stores sampled values of a segment of the physiological signal in temporary memory storage; and stores the sampled values in non-temporary storage in response to receiving an indication of continued detection of the physiological condition.
Claims19
An apparatus comprising:
- a sensing circuit configured to generate a sensed physiological signal, wherein the physiological signal includes ventricular depolarization (V-V) interval information of a subject;
- a detection circuit electrically coupled to the sensing circuit and configured to:
- during a detection window, detect a cardiac arrhythmia of a subject using a V-V interval stability detection criterion;
- and
- at the end of the detection window, confirm the cardiac arrhythmia using a second detection criterion more specific than the V-V interval stability detection criterion, wherein the V-V interval stability detection criterion is more sensitive than the second detection criterion;
- and
- a control circuit configured to:
- store, in response to detection of cardiac arrhythmia using the V-V interval stability, sampled values of a segment of the physiological signal during the detection window in temporary memory storage;
- receive, after detection of the cardiac arrhythmia using the V-V interval stability, an indication of confirmation of the detected cardiac arrhythmia using the second detection criterion;
- and
- store, in response to receiving the indication of confirmation of the detected cardiac arrhythmia, the sampled values of the segment of the physiological signal during the detection window in non-temporary storage.
8 more elements
An apparatus comprising:
- a sensing circuit is configured to generate a sensed cardiac signal representative of cardiac activity of a subject;
- a control circuit;
- and
- an arrhythmia detection circuit configured to:
- detect atrial fibrillation (AF) in the sensed cardiac signal using a first AF detection criterion that includes V-V interval stability;
- confirm AF using a second AF detection criterion, wherein the first AF detection criterion has greater sensitivity to AF detection than the second AF detection criterion, and the second AF detection criterion has greater specificity to AF detection than the first AF detection criterion;
- and
- provide an indication of AF confirmation to the control circuit;
- and
- wherein the control circuit is configured to:
- initiate sensing of the cardiac signal during a first specified detection time duration as a first AF detection window using the first AF detection criterion;
- store sampled values of the sensed cardiac signal sensed during the first detection window in temporary storage;
- recurrently overwrite memory of the temporary storage during the first detection window;
- initiate, in response to detection of AF during the first AF detection window, sensing of the cardiac signal during a second AF detection window using the second AF detection criterion and the stored sampled values in the temporary memory storage, wherein the second AF detection window has a longer time duration than the first AF detection window;
- and
- store the sampled values of the cardiac signal sensed during the first AF detection window in non-temporary memory storage in response to confirming AF using the second AF detection criterion.
13 more elements
Dependencies are inferred from the claim text.