Medical device ECG marker for use in compressed data stream
First Claim
1. A method comprising:
- monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
generating a trigger indicator signal upon finding the trigger event;
recording a plurality of sampled values of the electrogram signal in a memory structure; and
recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein recording the trigger indicator signal in the memory structure comprises replacing one of the sampled values with the trigger indicator signal and wherein the trigger event comprises detection of out-of-range values of the electrogram signal.
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Abstract
Triggers and noise should be available as information in recorded electrograms in memories of implantable medical devices. Particularly where the recording of electrogram data is done in the far field, there will be considerable noise and the interpretation of ECG'"'"'s reproduced from such recorded data will benefit from the storing of information regarding contemporaneous noise. By storing contemporaneous trigger data and noise data directly in the ECG data, recordings of the ECG data become more useful for physician use when played back through an external display system with minimal loss of ECG data, since out of range values are employed for the noise and trigger information and this non-ECG data is limited in size to no longer than individual point values of the ECG signal.
130 Citations
41 Claims
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1. A method comprising:
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monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
generating a trigger indicator signal upon finding the trigger event;
recording a plurality of sampled values of the electrogram signal in a memory structure; and
recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein recording the trigger indicator signal in the memory structure comprises replacing one of the sampled values with the trigger indicator signal and wherein the trigger event comprises detection of out-of-range values of the electrogram signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
generating a trigger indicator signal upon finding the trigger event;
recording a plurality of sampled values of the electrogram signal in a memory structure; and
recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein recording the trigger indicator signal in the memory structure comprises replacing one of the sampled values with the trigger indicator signal, and further comprising recording other sensor data in the memory structure, wherein the other sensor data comprises a plurality of samples of other sensor data, the method further comprising recording one sample of other sensor data per thirty sampled values of the electrogram signal.
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15. A medium containing stored executable instructions for performing a method, comprising:
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instruction for monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
instructions for generating a trigger indicator signal upon finding the trigger event;
instructions for recording a plurality of sampled values of the electrogram signal in a memory structure; and
instructions for recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein the recording the trigger indicator signal in the memory structure further comprises instructions for replacing one of the sampled values with the trigger indicator signal and wherein the trigger event comprises detection of out-of-range values of the electrogram signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A medium containing stored executable instructions for performing a method, comprising:
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instructions for monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
instructions for generating a trigger indicator signal upon finding the trigger event;
instructions for recording a plurality of sampled values of the electrogram signal in a memory structure; and
instructions for recording the trigger indicator signal in the memory structure contemporaneously with recording sampled values of the electrogram signal, wherein the recording the indicator signal in the memory structure further comprises instructions for replacing one of the sampled values with the trigger indicator signal and further comprising instructions for recording other sensor data in the memory structure and wherein the other sensor data comprises a plurality of samples of other sensor data, the medium further comprising instructions for recording one sample of other sensor data per thirty sampled values of the electrogram signal.
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29. An apparatus for performing a method, comprising:
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means for monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;
means for generating a trigger indicator signal upon finding the trigger event;
means for recording a plurality of sampled values of the electrogram signal in a memory structure; and
means for recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein the recording the trigger indicator signal in the memory structure further comprises means for replacing one of the sampled values with the trigger indicator signal and wherein the trigger event comprises detection of out-of-range values of the electrogram signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification