IMPLANTABLE CARDIAC SYSTEMS WITH BASELINE CORRECTION IN RESPONSE TO NOISE DETECTION
First Claim
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1. An implantable cardiac device comprising electrodes for receiving cardiac signals and operational circuitry for processing the cardiac signals received by the electrodes;
- in which the operational circuitry is configured to;
receive signals via the electrodes;
detect events in the received signals by comparing the received signals to one or more thresholds and identifying threshold crossings;
determine which, if any, of the detected events are noisy;
determine whether a noise condition has been detected; and
if a noise condition has been detected, enable a baseline correction method to ensure that the noise that caused the noise condition does not induce a baseline offset and thereby impair sensing.
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Abstract
Implantable cardiac devices and methods of their use. A method of operation in an implantable cardiac device may include steps for characterizing detected events as noise or not noise, identifying a set of consecutive noise events or a threshold quantity of noise events in a set period of time and declaring a noisy series to have occurred. In response to the declaration of a noisy series, the method initiates a baseline correction algorithm. Devices for performing such methods are also disclosed.
12 Citations
19 Claims
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1. An implantable cardiac device comprising electrodes for receiving cardiac signals and operational circuitry for processing the cardiac signals received by the electrodes;
- in which the operational circuitry is configured to;
receive signals via the electrodes; detect events in the received signals by comparing the received signals to one or more thresholds and identifying threshold crossings; determine which, if any, of the detected events are noisy; determine whether a noise condition has been detected; and if a noise condition has been detected, enable a baseline correction method to ensure that the noise that caused the noise condition does not induce a baseline offset and thereby impair sensing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- in which the operational circuitry is configured to;
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9. A method of operation in an implantable cardiac device that includes electrodes for receiving cardiac signals and operational circuitry for processing the cardiac signals received by the electrodes;
- the method comprising;
the operational circuitry receiving signals via the electrodes; the operational circuitry detecting events in the received signals by comparing the received signals to one or more thresholds and identifying threshold crossings; the operational circuitry determining which, if any, of the detected events are noisy; the operational circuitry determining whether a noise condition has been detected; and if a noise condition has been detected, the operational circuitry enabling a baseline correction method to ensure that the noise that caused the noise condition does not induce a baseline offset and thereby impair sensing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- the method comprising;
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17. An implantable cardiac device comprising electrodes for receiving cardiac signals and operational circuitry for processing the cardiac signals received by the electrodes;
- in which the operational circuitry is configured to;
receive signals via the electrodes; detect events in the received signals by comparing the received signals to one or more detection thresholds and identifying detection threshold crossings; identify an average magnitude for the received signals wherein average magnitude is determined by sampling the received signals across a period of time that exceeds a single cardiac cycle; determine whether the average magnitude deviates from a quiescent point; adjust the detection threshold using a correction factor related to the deviation of the average magnitude from the quiescent point detect at least one cardiac event using the detection threshold as adjusted by the correction factor. - View Dependent Claims (18, 19)
- in which the operational circuitry is configured to;
Specification