Implantable pulse generator and method having adjustable signal blanking
First Claim
1. An implantable pulse generator, comprising:
- a signal sensor to sense a first cardiac signal;
a blanking window initiator coupled to the signal sensor, the blanking window initiator adapted to identify cardiac events in the first cardiac signal and to start a blanking interval when a cardiac event is identified in the first cardiac signal, the blanking interval including a repeatable noise window blanking interval;
a noise detector coupled to the signal sensor and the blanking window initiator, the noise detector adapted to analyze the first cardiac signal to detect noise identified by a predetermined noise frequency range in the first cardiac signal during the repeatable noise window blanking interval, wherein the blanking window initiator is adapted to repeat the repeatable noise window blanking interval when the noise detector detects noise in the first cardiac signal during the repeatable noise window blanking interval; and
a pace output circuit, coupled to the one or more electrodes, to deliver pacing pulses including pacing pulses separated by a pacing escape interval,wherein the noise detector is adapted to sum repeated repeatable noise window blanking intervals to give a duration of the repeatable noise window blanking intervals and to issue a first signal to start delivery of asynchronous pacing pulses when the duration of the repeated repeatable noise window blanking intervals is greater than the pacing escape 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.
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Citations
28 Claims
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1. An implantable pulse generator, comprising:
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a signal sensor to sense a first cardiac signal; a blanking window initiator coupled to the signal sensor, the blanking window initiator adapted to identify cardiac events in the first cardiac signal and to start a blanking interval when a cardiac event is identified in the first cardiac signal, the blanking interval including a repeatable noise window blanking interval; a noise detector coupled to the signal sensor and the blanking window initiator, the noise detector adapted to analyze the first cardiac signal to detect noise identified by a predetermined noise frequency range in the first cardiac signal during the repeatable noise window blanking interval, wherein the blanking window initiator is adapted to repeat the repeatable noise window blanking interval when the noise detector detects noise in the first cardiac signal during the repeatable noise window blanking interval; and a pace output circuit, coupled to the one or more electrodes, to deliver pacing pulses including pacing pulses separated by a pacing escape interval, wherein the noise detector is adapted to sum repeated repeatable noise window blanking intervals to give a duration of the repeatable noise window blanking intervals and to issue a first signal to start delivery of asynchronous pacing pulses when the duration of the repeated repeatable noise window blanking intervals is greater than the pacing escape interval. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable pulse generator, comprising:
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a signal sensor to sense a first cardiac signal; a blanking window initiator coupled to the signal sensor, the blanking window initiator adapted to identify cardiac events in the first cardiac signal and to start a blanking interval when a cardiac event is identified in the first cardiac signal, the blanking interval including a repeatable noise window blanking interval; a noise detector coupled to the signal sensor and the blanking window initiator, the noise detector adapted to analyze the first cardiac signal to detect noise identified by a predetermined noise frequency range in the first cardiac signal during the repeatable noise window blanking interval, wherein the blanking window initiator is adapted to repeat the repeatable noise window blanking interval when the noise detector detects noise in the first cardiac signal during the repeatable noise window blanking interval; and a pace output circuit, coupled to the one or more electrodes, to deliver pacing pulses including pacing pulses separated by a pacing escape interval, wherein the noise detector is adapted to sum repeated repeatable noise window blanking intervals to give a duration of the repeatable noise window blanking intervals and to compare the duration of the repeatable noise window blanking intervals to the pacing escape interval, and wherein the noise detector is adapted to repeat the pacing escape interval when the duration of the repeatable noise window blanking intervals is greater than the pacing escape interval. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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sensing a first cardiac signal; identifying cardiac events in the first cardiac signal; starting a blanking interval when one of the cardiac events is identified, the blanking interval including a repeatable noise window blanking interval; detecting noise in the first cardiac signal during the repeatable noise window blanking interval, the noise identified by a predetermined noise frequency range; repeating the repeatable noise window blanking interval when the noise is detected; summing a duration of repeated repeatable noise window blanking intervals; comparing the duration to a pacing escape interval; and delivering asynchronous pacing pulses when the duration is greater than the pacing escape interval. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method, comprising:
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sensing a first cardiac signal; identifying cardiac events in the first cardiac signal; starting a blanking interval when one of the cardiac events is identified, the blanking interval including a repeatable noise window blanking interval; detecting noise in the first cardiac signal during the repeatable noise window blanking interval, the noise identified by a predetermined noise frequency range; repeating the repeatable noise window blanking interval when the noise is detected; summing a duration of repeated repeatable noise window blanking intervals; comparing the duration to a pacing escape interval; and repeating the pace escape interval when the duration is greater than the pacing escape interval. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification