Device and method for detection of atrial fibrillation
AssigneeBIOTRONIK SE & Co. KG
InventorsGarth Garner, R. Hollis Whittington, Dirk Muessig
Life of this patent
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Abstract
A cardiac device and method thereof for detecting atrial fibrillation within a mean heart signal of a body, wherein the cardiac device includes at least two sensing electrodes. The method includes providing an input heart signal, detecting sense events (VS) and noise events (VN), and generating further noise events (VN) each at a predetermined time interval after a noise event (VN) has been detected and when the noise event (VN) continues. The method includes incrementing a noise counter for each noise event (VN) and each further noise event (VN), and terminating the detection of atrial fibrillation when the noise counter reaches a predetermined limit.
Claims13
A cardiac device configured to detect atrial fibrillation within a heart signal obtained from a heart comprising:
- at least two sensing electrodes;
- at least one input channel that provides an input heart signal;
- a detector that detects sense events (VS) and noise events (VN);
- a noise counter;
- a processor that terminates the detection of atrial fibrillation when the noise counter reaches a predetermined limit;
- at least one noise marker generator that generates further noise events (VN) each at a predetermined time interval after a noise event (VN) has been detected and when the noise event (VN) continues,
- wherein said processor increments and resets the noise counter for each noise event (VN) and each further noise event (VN);
- an interval counter,
- wherein said processor increments, decrements and resets the interval counter;
- and,
- a stable packet counter,
- wherein said processor increments and decrements the stable packet counter;
- and,
- wherein for a noise event (VN), the interval counter is decrementable and the noise counter is incrementable, wherein the noise counter and the interval counter are resettable and the stable packet counter is incrementable when the noise counter reaches a predetermined limit, and wherein the detection of atrial fibrillation is terminated when the stable packet counter reaches a predetermined limit.
A method to detect atrial fibrillation within a heart signal obtained from a heart using a cardiac device, comprising:
- providing a cardiac device comprising at least to sensing electrodes, at least one input channel, a detector, a noise counter processor, and at least one noise marker generator;
- providing an input heart signal via said at least one input channel;
- detecting sense events (VS) and noise events (VN) via said detector;
- terminating the detection of atrial fibrillation when the noise counter reaches a predetermined limit via said processor;
- generating further noise events (VN) each at a predetermined, time interval after a noise event (VN) has been detected, and when the noise event (VN) continues via said at least one noise marker generator;
- and,
- incrementing a noise counter for each noise event (VN) and each further noise event (VN) via said processor;
- and,
- wherein said cardiac device further comprises at an interval counter and a stable packet counter, wherein for a noise event (VN) said interval counter is decremented and the noise counter is incremented via said processor, wherein the noise counter and the interval counter are reset and the stable packet counter is incremented when the noise counter reaches a predetermined limit via said processor, and wherein the detection of atrial fibrillation is terminated when the stable packet counter reaches a predetermined limit via said processor.
Dependencies are inferred from the claim text.