Implantable pulse generator and method having adjustable signal blanking
First Claim
1. An implantable pulse generator, comprising:
- a signal sensor configured to sense a first cardiac signal and a second cardiac signal;
a pace output circuit configured to deliver pacing pulses;
a blanking window initiator coupled to the signal sensor and the pace output circuit, the blanking window initiator configured to identify cardiac events, start a blanking interval in response to each event of the cardiac events being identified in the first cardiac signal or the second cardiac signal, the blanking interval including a repeatable noise window blanking interval, and adjust the blanking interval depending on which of the first cardiac signal and the second cardiac signal the each event is identified in and depending on whether the each event is identified as a paced cardiac event or a sensed cardiac event; and
a noise detector coupled to the signal sensor and the blanking window initiator, the noise detector configured to detect noise in the first cardiac signal and the second cardiac signal during the repeatable noise window blanking interval,wherein the blanking window initiator is configured to repeat the repeatable noise window blanking interval in response to the noise being detected in the first cardiac signal or the second cardiac signal during the repeatable noise window blanking interval.
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Abstract
An implantable pulse generator senses a cardiac signal, identifies cardiac events in the cardiac signal, and starts a blanking interval including a repeatable noise window blanking interval in response to each cardiac event. When noise is detected during the repeatable noise window blanking interval, the noise window blanking interval is repeated. In one embodiment, the duration of repeated repeatable noise window blanking intervals is summed and compared to a pacing escape interval. When the sum is greater than the pacing escape interval, asynchronous pacing pulses are delivered until the noise ceases. Alternatively, when the sum is greater than the pacing escape interval, the pace escape interval is repeated.
106 Citations
20 Claims
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1. An implantable pulse generator, comprising:
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a signal sensor configured to sense a first cardiac signal and a second cardiac signal; a pace output circuit configured to deliver pacing pulses; a blanking window initiator coupled to the signal sensor and the pace output circuit, the blanking window initiator configured to identify cardiac events, start a blanking interval in response to each event of the cardiac events being identified in the first cardiac signal or the second cardiac signal, the blanking interval including a repeatable noise window blanking interval, and adjust the blanking interval depending on which of the first cardiac signal and the second cardiac signal the each event is identified in and depending on whether the each event is identified as a paced cardiac event or a sensed cardiac event; and a noise detector coupled to the signal sensor and the blanking window initiator, the noise detector configured to detect noise in the first cardiac signal and the second cardiac signal during the repeatable noise window blanking interval, wherein the blanking window initiator is configured to repeat the repeatable noise window blanking interval in response to the noise being detected in the first cardiac signal or the second cardiac signal during the repeatable noise window blanking interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating an implantable pulse generator, comprising:
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sensing a first cardiac signal and a second cardiac signal; delivering pacing pulses; identifying cardiac events in the first cardiac signal and the second cardiac signal; starting a blanking interval in response to each event of the cardiac events being identified, the blanking interval including a repeatable noise window blanking interval; adjusting the blanking interval depending on which of the first cardiac signal and the second cardiac signal the each event is identified in and depending on whether the each event is identified as a paced cardiac event or a sensed cardiac event; detecting noise in the first cardiac signal and the second cardiac signal during the repeatable noise window blanking interval; and repeating the repeatable noise window blanking interval in response to the noise being detected in the first cardiac signal or the second cardiac signal during the repeatable noise window blanking interval. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification