Method of detecting signal clipping in a wearable ambulatory medical device
First Claim
1. A wearable medical device, comprising:
- a plurality of ECG sensing electrodes configured to sense an ECG of a patient;
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, the ECG acquisition circuit including a programmable attenuation/gain stage electrically coupled between a first gain stage and a second gain stage;
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 receive and monitor the digitized ECG signal, to detect clipping of the amplified and conditioned analog ECG signal based upon the digitized ECG signal, and to determine whether the clipping of the amplified and conditioned analog ECG signal occurred before or after the programmable attenuation/gain stage.
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Accused Products
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 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.
248 Citations
20 Claims
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1. A wearable medical device, comprising:
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a plurality of ECG sensing electrodes configured to sense an ECG of a patient; 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, the ECG acquisition circuit including a programmable attenuation/gain stage electrically coupled between a first gain stage and a second gain stage; 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 receive and monitor the digitized ECG signal, to detect clipping of the amplified and conditioned analog ECG signal based upon the digitized ECG signal, and to determine whether the clipping of the amplified and conditioned analog ECG signal occurred before or after the programmable attenuation/gain stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wearable medical device, comprising:
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a plurality of ECG sensing electrodes configured to sense an ECG of a patient; 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, the ECG acquisition circuit including a programmable attenuation/gain stage electrically coupled between a first gain stage and a second gain stage; 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 receive and monitor the digitized ECG signal and 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 of a 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 (19, 20)
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Specification