State-based atrial event detection
First Claim
1. An implantable medical device comprising:
- a memory configured to store criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state;
sensing circuitry configured to sense a cardiac signal that varies as a function of a cardiac cycle of a patient; and
processing circuitry coupled to the sensing circuitry, the processing circuitry being configured to;
detect an R-wave in the sensed cardiac signal;
determine an elapsed time since the detection of the R-wave;
determine one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave;
compare the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and
detect a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model.
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Accused Products
Abstract
An implantable medical device includes a memory storing criteria for transitioning between states of a cardiac cycle model, the states including a P-wave state. The device also includes sensing circuitry that senses a cardiac signal that varies as a function of a cardiac cycle of a patient, and also includes processing circuitry coupled to the sensing circuitry. The processing circuitry is configured to detect an R-wave in the sensed cardiac signal, to determine an elapsed time since the detection of the R-wave, to determine one or more morphological values of a post-R-wave segment of the cardiac signal to compare the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model, and to detect a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model.
213 Citations
25 Claims
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1. An implantable medical device comprising:
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a memory configured to store criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state; sensing circuitry configured to sense a cardiac signal that varies as a function of a cardiac cycle of a patient; and processing circuitry coupled to the sensing circuitry, the processing circuitry being configured to; detect an R-wave in the sensed cardiac signal; determine an elapsed time since the detection of the R-wave; determine one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave; compare the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and detect a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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storing, to a memory of an implantable medical device, criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state; sensing, by sensing circuitry of the implantable medical device, a cardiac signal that varies as a function of a cardiac cycle of a patient; detecting, by processing circuitry of the implantable medical device, an R-wave in the sensed cardiac signal; determining, by the processing circuitry, an elapsed time since the detection of the R-wave; determining, by the processing circuitry, one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave; comparing, by the processing circuitry, the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and detecting, by the processing circuitry, a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A non-transitory computer-readable storage medium encoded with instructions that, when executed, cause one or more processors of an implantable medical device to:
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store, to the computer-readable storage medium, criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state; sense, using sensing circuitry of the implantable medical device, a cardiac signal that varies as a function of a cardiac cycle of a patient; detect an R-wave in the sensed cardiac signal; determine an elapsed time since the detection of the R-wave; determine one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave; compare the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and detect a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model.
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24. An implantable medical device comprising:
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means for storing criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state; means for sensing a cardiac signal that varies as a function of a cardiac cycle of a patient; means for detecting an R-wave in the sensed cardiac signal; means for determining an elapsed time since the detection of the R-wave; means for determining one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave; means for comparing the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and means for detecting a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model.
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25. A medical device system comprising:
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a first implantable medical device comprising; a memory configured to store criteria for transitioning between a plurality of states of a cardiac cycle model, the plurality of states including a P-wave state; sensing circuitry configured to sense a cardiac signal that varies as a function of a cardiac cycle of a patient; processing circuitry coupled to the sensing circuitry, the processing circuitry being configured to; detect an R-wave in the sensed cardiac signal; determine an elapsed time since the detection of the R-wave; determine one or more morphological values of a post-R-wave segment of the cardiac signal occurring after the detection of the R-wave; compare the elapsed time and the one or more morphological values to the stored criteria for transitioning between the plurality of states of the cardiac cycle model; and detect a P-wave in the sensed cardiac signal in response to a transition to the P-wave state of the cardiac cycle model; and communication circuitry configured to generate a signal to deliver a pacing pulse at a predetermined time after the detection of the P-wave, the processing circuitry being further configured to control the communication circuitry to send the signal in response to detecting the P-wave; and a second implantable medical device configured to; receive the signal sent by the communication circuitry of the first implantable medical device; and in response to receiving the signal, deliver a pacing pulse to the patient.
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Specification