Method of detecting signal clipping in a wearable ambulatory medical device
First Claim
1. A method of detecting clipping of ECG signals in a wearable medical device, the method comprising acts of:
- sensing an ECG signal of a patient using ECG sensing electrodes;
amplifying the ECG signal using a first gain stage;
conditioning the amplified ECG signal from the first gain stage using a programmable attenuation/gain stage;
amplifying the conditioned ECG signal from the programmable attenuation/gain stage using a second gain stage;
receiving and digitizing the amplified and conditioned analog ECG signal to provide a digitized ECG signal;
monitoring the digitized ECG signal to detect clipping of the amplified and conditioned analog ECG signal based upon the digitized ECG signal;
determining whether the clipping of the amplified and conditioned analog ECG signal occurred before or after the programmable attenuation/gain stage; and
varying an amount of attenuation applied by the programmable attenuation/gain stage based on the digitized ECG signal responsive to determining that the clipping of the amplified and conditioned analog ECG signal occurred after the programmable attenuation/gain stage.
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Abstract
A wearable medical device and method of detecting clipping of ECG signals is disclosed. In one embodiment, the wearable medical device comprises a plurality of ECG sensing electrodes configured to sense an ECG of a patient and an ECG acquisition circuit electrically coupled to a pair of the plurality of ECG sensing electrodes and configured to provide an amplified and conditioned analog ECG signal, a programmable attenuation/gain stage electrically coupled between a first gain stage and a second gain stage, an ADC electrically coupled to the ECG acquisition circuit to receive and digitize the amplified and conditioned analog ECG signal and provide a digitized ECG signal, and a signal conditioning to and control unit electrically coupled to the ECG acquisition circuit and the ADC to receive and monitor the digitized ECG signal and to detect clipping of the amplified and conditioned analog ECG signal based upon the digitized ECG signal.
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Citations
17 Claims
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1. A method of detecting clipping of ECG signals in a wearable medical device, the method comprising acts of:
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sensing an ECG signal of a patient using ECG sensing electrodes; amplifying the ECG signal using a first gain stage; conditioning the amplified ECG signal from the first gain stage using a programmable attenuation/gain stage; amplifying the conditioned ECG signal from the programmable attenuation/gain stage using a second gain stage; receiving and digitizing the amplified and conditioned analog ECG signal to provide a digitized ECG signal; monitoring the digitized ECG signal to detect clipping of the amplified and conditioned analog ECG signal based upon the digitized ECG signal; determining whether the clipping of the amplified and conditioned analog ECG signal occurred before or after the programmable attenuation/gain stage; and varying an amount of attenuation applied by the programmable attenuation/gain stage based on the digitized ECG signal responsive to determining that the clipping of the amplified and conditioned analog ECG signal occurred after the programmable attenuation/gain stage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting clipping of ECG signals in a wearable medical device, the method comprising acts of:
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sensing an ECG signal of a patient using ECG sensing electrodes; amplifying the ECG signal using a first gain stage; conditioning the amplified ECG signal from the first gain stage using a programmable attenuation/gain stage; amplifying the conditioned ECG signal from the programmable attenuation/gain stage using a second gain stage; receiving and digitizing the amplified and conditioned ECG signal to provide a digitized ECG signal; and monitoring the digitized ECG signal to determine whether a voltage level is approaching a clipping threshold based upon the digitized ECG signal, the clipping threshold being determined based on at least a voltage range of an ECG human patient, a maximum to output voltage level and a current gain setting of each of the first gain stage, the programmable attenuation/gain stage and the second gain stage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification