Self-diagnostic method and system for implantable cardiac device
First Claim
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1. A cardiac rhythm management device, comprising:
- one or more intra-cardiac sensing channels for sensing intrinsic cardiac activity and generating intra-cardiac electrogram signals;
a sensing channel incorporating a subcutaneous electrode for generating a subcutaneous ECG signal wherein the subcutaneous electrode is mounted on an implantable housing for the device;
a pacing channel for pacing a cardiac chamber;
a controller for receiving sensing signals and controlling the delivery of pacing pulses in accordance with a programmed mode; and
,wherein the controller is programmed to detect chamber senses in the subcutaneous ECG and intra-cardiac electrogram signals, cross-check the chamber senses detected in the subcutaneous ECG signal and the intra-cardiac electrogram signal to determine whether a chamber sense is detected in one signal but not the other, and set an alarm flag if a discrepancy is found to exist.
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Abstract
A self-diagnostic system for an implantable cardiac device such as a pacemaker, cardioverter, or resynchronization device which utilizes a subcutaneous ECG channel is described. The subcutaneous ECG channel allows the device to, in real time and independent of the standard pacing and sensing circuitry, verify the presence of pacing spikes, chamber senses, and other device outputs and hence establish and verify device integrity.
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Citations
23 Claims
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1. A cardiac rhythm management device, comprising:
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one or more intra-cardiac sensing channels for sensing intrinsic cardiac activity and generating intra-cardiac electrogram signals; a sensing channel incorporating a subcutaneous electrode for generating a subcutaneous ECG signal wherein the subcutaneous electrode is mounted on an implantable housing for the device; a pacing channel for pacing a cardiac chamber; a controller for receiving sensing signals and controlling the delivery of pacing pulses in accordance with a programmed mode; and
,wherein the controller is programmed to detect chamber senses in the subcutaneous ECG and intra-cardiac electrogram signals, cross-check the chamber senses detected in the subcutaneous ECG signal and the intra-cardiac electrogram signal to determine whether a chamber sense is detected in one signal but not the other, and set an alarm flag if a discrepancy is found to exist. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for operating a cardiac rhythm management device, comprising:
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sensing cardiac activity via an intra-cardiac sensing channel incorporating an intra-cardiac electrode; recording a subcutaneous ECG signal from a subcutaneous sensing channel incorporating a subcutaneous electrode wherein the subcutaneous electrode is mounted on an implantable housing for the device; delivering pacing pulses to a cardiac chamber in accordance with a programmed mode; and
,detecting chamber senses in the subcutaneous ECG and intra-cardiac electrogram signals, cross-checking the chamber senses detected in the subcutaneous ECG signal and the intra-cardiac electrogram signal to determine whether a chamber sense is detected in one signal but not the other, and setting an alarm flag if a discrepancy is found to exist. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification