Implantable pulse generator and method having adjustable signal blanking
First Claim
1. An implantable pulse generator, comprising:
- a first lead having one or more electrodes;
a signal sensor coupled to one or more electrodes on the first cardiac lead to sense a first cardiac signal related to a heart;
a blanking window initiator coupled to the signal sensor, wherein the blanking window initiator identifies cardiac events in the first cardiac signal, and wherein the blanking interval includes a repeatable noise window blanking interval; and
a noise detector coupled to the signal sensor and the blanking window initiator, wherein the noise detector analyzes 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 repeats 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
wherein the blanking window initiator identifies sensed cardiac events and paced cardiac events, and wherein the blanking window initiator adjusts the blanking interval to a first overall duration when a paces cardiac event is identified and to a second different overall duration when a sensed cardiac event is identified.
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Abstract
An implantable pulse generator and a method of operation, where the pulse generator is adapted to sense at least a first cardiac signal. Cardiac events are identified in the first cardiac signal, in response to which a blanking interval is started. The blanking interval includes a repeatable noise window blanking interval. When noise is detected during the repeatable noise window blanking interval, the noise window blanking interval is repeated. Depending upon the type of sensed cardiac event (paced or intrinsic) the blanking interval is adjusted to either to a first overall duration or a second overall duration. The second overall duration includes a first timed interval that has a programmable value. The repeatable noise window blanking interval starts after the first timed interval of the second overall duration. 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. When the noise ceases, so does the delivery of asynchronous pacing pulses. Alternatively, when the sum is greater than the pacing escape interval, the pace escape interval is repeated. Pacing is resumed after one pacing escape interval after the noise signal ceases.
144 Citations
33 Claims
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1. An implantable pulse generator, comprising:
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a first lead having one or more electrodes;
a signal sensor coupled to one or more electrodes on the first cardiac lead to sense a first cardiac signal related to a heart;
a blanking window initiator coupled to the signal sensor, wherein the blanking window initiator identifies cardiac events in the first cardiac signal, and wherein the blanking interval includes a repeatable noise window blanking interval; and
a noise detector coupled to the signal sensor and the blanking window initiator, wherein the noise detector analyzes 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 repeats 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
wherein the blanking window initiator identifies sensed cardiac events and paced cardiac events, and wherein the blanking window initiator adjusts the blanking interval to a first overall duration when a paces cardiac event is identified and to a second different overall duration when a sensed cardiac event is identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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sensing a first cardiac signal related to a heart;
identifying cardiac events in the first cardiac signal, including identifying a nature of each of the cardiac events;
adjusting a duration of a blanking interval based on the nature of the each of the cardiac events when the each of the cardiac events is identified in the first cardiac signal, wherein the blanking interval includes a repeatable noise window blanking interval;
starting the blanking interval;
detecting noise in the first cardiac signal during the repeatable noise window blanking interval; and
repeating the repeatable noise window blanking interval. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification