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US 2009/0157128 A1Published application
Sensing threshold control to limit amplitude tracking
AssigneeCardiac Pacemakers, Inc.
InventorsGary T. Seim, Ron A. Balczewski
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Abstract
A depolarization sensing threshold can be determined using an amplitude-limited portion of a cardiac signal received using an implantable medical device. One or more cardiac depolarizations can be detected using the cardiac signal and the depolarization sensing threshold.
Claims20
An implantable medical device, comprising:
- an input configured to receive a cardiac signal;
- a first comparator configured to receive the cardiac signal from the input and to provide an amplitude-limited portion of the cardiac signal;
- a depolarization sensing threshold generation circuit configured to provide a depolarization sensing threshold using the amplitude-limited portion of the cardiac signal;
- and
- a depolarization detection circuit configured to detect a cardiac depolarization using the cardiac signal and the depolarization sensing threshold.
2 more elements
A method, comprising:
- receiving a cardiac signal using an implantable medical device;
- limiting an amplitude of the received cardiac signal to provide an amplitude-limited portion of the cardiac signal;
- determining a depolarization sensing threshold using the amplitude-limited portion of the cardiac signal;
- and
- detecting a cardiac depolarization using the cardiac signal and the depolarization sensing threshold.
2 more elements
Dependencies are inferred from the claim text.