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US 2007/0167849 A1Published application
Implantable medical device sensing wireless ecg as substitute for intracardiac electrogram
AssigneeCardiac Pacemakers, Inc.
InventorsYi Zhang, Aaron McCabe, David Yonce, Julie Thompson
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Abstract
A cardiac rhythm management (CRM) system includes an implantable medical device that senses a wireless electrocardiogram (ECG), which is a signal sensed with implantable electrodes and approximating a surface ECG. In one embodiment, the wireless ECG is sensed as a substitute signal for the intracardiac electrogram when the sensing of the intracardiac electrogram becomes unreliable.
Claims20
A cardiac rhythm management (CRM) system, comprising:
- an implantable medical device including:
- a primary sensing circuit including an electrogram sensing circuit to sense an intracardiac electrogram;
- an auxiliary sensing circuit including a wireless electrocardiogram (ECG) sensing circuit to sense a subcutaneous ECG;
- a processing circuit having an input to receive a first signal being one of the intracardiac electrogram and the subcutaneous ECG;
- a switch circuit coupled to the input of the processing circuit, the switch circuit configured to receive a selection signal and to connect the input of the processing circuit to one of the primary sensing circuit and the auxiliary sensing circuit according to the selection signal;
- and
- a selection circuit coupled to the switch circuit, the selection circuit adapted to produce the selection signal;
- and
- a plurality of implantable subcutaneous electrodes coupled to the auxiliary sensing circuit.
6 more elements
A method, comprising:
- sensing an intracardiac electrogram through an implantable lead;
- detecting a failure signal indicating a failure in sensing the intracardiac electrogram;
- and
- sensing a subcutaneous electrocardiogram (ECG) as a substitute for the intracardiac electrogram if the failure signal is detected.
1 more element
Dependencies are inferred from the claim text.