METHOD OF DETECTING SIGNAL CLIPPING IN A WEARABLE AMBULATORY MEDICAL DEVICE
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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.
35 Citations
38 Claims
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1-19. -19. (canceled)
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20. A wearable medical device, comprising:
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a plurality of ECG sensing electrodes configured to sense an ECG signal of a patient; an ECG acquisition circuit electrically coupled to a pair of the plurality of ECG sensing electrodes including a first gain stage to amplify the ECG signal, a programmable attenuation/gain stage coupled to the first gain stage to condition the amplified ECG signal, and a second gain stage coupled to the programmable attenuation/gain stage to amplify the conditioned ECG signal; an analog to digital converter 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 and control unit electrically coupled to the ECG acquisition circuit and the analog to digital converter to monitor the digitized ECG signal, to determine whether a voltage level of the ECG signal is approaching a first threshold in the first gain stage based on at least the digitized ECG signal, and to mark the amplified and conditioned analog ECG signal as compromised in response to a determination that the voltage level of the ECG signal is approaching the first threshold. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A wearable medical device, comprising:
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a plurality of ECG sensing electrodes configured to sense an ECG signal of a patient; an ECG acquisition circuit electrically coupled to a pair of the plurality of ECG sensing electrodes and including a first gain stage to amplify the ECG signal, a programmable attenuation/gain stage coupled to the first gain stage to condition the amplified ECG signal, and a second gain stage coupled to the programmable attenuation/gain stage to amplify the conditioned ECG signal; an analog to digital converter 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 and control unit electrically coupled to the ECG acquisition circuit and the analog to digital converter to monitor the digitized ECG signal and to determine whether at least one of the ECG signal, the amplified ECG signal, the amplified and conditioned ECG signal, and the digitized ECG signal is approaching at least one clipping threshold based upon the digitized ECG signal, the at least one clipping threshold being determined based on at least one of a voltage range of an ECG human patient, a maximum 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 (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification