Abstract:
A cardiac monitoring system includes cardiac sensing electrodes for external placement proximate to the patient to sense ECG signals of the patient; one or more accelerometers configured to generate patient activity data based on signals corresponding to changes in the patient's body position and movement; and a monitoring computer configured to correlate the ECG signals of the patient with the patient activity data generated from the one or more accelerometers to determine ECG signal contamination, analyze the ECG signals of the patient to extract at least heart rate data of the patient and detect a cardiac arrhythmia based at least in part on the heart rate data, and change a confidence in the detected cardiac arrhythmia based on the determined ECG signal contamination; wherein at least the patient activity data and the heart rate data are analyzed to determine a change in a physiological condition of the patient over time.
Abstract:
A wearable device and method of monitoring the condition of a patient. The wearable device includes at least one sensor and at least one processor operatively connected to the at least one sensor. The wearable device also includes an operator interface device operatively connected to the at least one processor. The at least one processor causes the device to allow for customization of at least one output message to be delivered via the operator interface device.
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.
Abstract:
A wearable defibrillator consists of a vest (or belt) which is worn by the patient. The device monitors the patient's ECG with sensing electrodes and can monitor other patient conditions and in appropriate cases can treat certain conditions. An accelerometer(s) in the wearable defibrillator can allow for the device to determine the position, movements, forces applied to the patient, and/or the device. The device can use a least one patient motion detector generating a signal indicative of patient activity. Analysis of the signal can be indicative of patient activity appropriate for treatment or indication of device condition.
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.
Abstract:
A wearable defibrillator and method of monitoring the condition of a patient. The wearable defibrillator includes at least one therapy pad, at least one sensor and at least one processing unit operatively connected to the one or more therapy pads and the one or more sensors. The wearable defibrillator also includes at least one audio device operatively connected to the one or more processing units. The one or more audio devices are configured to receive audio input from a patient.
Abstract:
A wearable defibrillator for monitoring life threatening arrhythmias in a patient includes a plurality of electrocardiogram (ECG) sensing electrodes to generate ECG data, one or more audio devices, and one or more processors. The one or more audio devices include a microphone configured to detect background noise and a speaker configured to produce an audio output. The one or more processors are configured to detect. from at least the ECG data, whether the patient is experiencing a life threatening arrhythmia, cause an audible alarm to be produced as the audio output in response to detecting that the patient is experiencing the life threatening arrhythmia, identify a level of the background noise detected by the microphone in response to detecting that the patient is experiencing the arrhythmia, and increase a confidence that the detected arrhythmia is appropriate for treatment in response to identifying that little to no background noise is detected.
Abstract:
A wearable arrhythmia monitoring and treatment device for improving confidence in determined arrhythmias prior to treatment includes a plurality of sensing electrodes, one or more therapy electrodes, and an electrode signal acquisition circuit having a plurality of inputs. The electrode signal acquisition circuit is configured to sense a respective signal provided by each of a plurality of different pairings of the plurality of sensing electrodes. The wearable arrhythmia monitoring and treatment device includes a monitoring and detection circuit including at least one processor configured to analyze the respective signals provided by each of the plurality of different pairings of the plurality of sensing electrodes, change a confidence level in a determined arrhythmia condition based on the respective signals provided by the plurality of different pairings of the plurality of sensing electrodes, and initiate a therapy to the patient via the one or more therapy electrodes based on the confidence level.
Abstract:
An arrhythmia monitoring device includes a plurality of pairs of ECG sensing electrodes disposed in a garment configured to be worn about a torso of a patient, and signal acquisition circuit configured to be electrically coupled to the plurality pairs of ECG sensing electrodes. The device includes a processor in communication with the signal acquisition circuit configured to execute a selection process comprising identifying a quality of each of a plurality of ECG signals, ranking the signals based on the identified quality, and selecting at least two ECG signals to monitor having highest quality. The processor is configured to re-execute the selection process following an event including at least one of the garment shifting on the torso, the garment being repositioned on the torso, and the garment being removed and returned to the torso of the patient, and monitor the selected at least two ECG signals for a cardiac arrhythmia.
Abstract:
An ambulatory medical device including a plurality of electrodes configured to be disposed at spaced apart positions about a patient's body, an electrode signal acquisition circuit, and a monitoring circuit. The acquisition circuit has a plurality of inputs each electrically coupled to a respective electrode of the plurality of electrodes and is configured to sense a respective signal provided by a plurality of different pairings of the plurality of electrodes. The monitoring circuit is electrically coupled to an output of the acquisition circuit and is configured to analyze the respective signal provided by each of the plurality of different pairings and to instruct the acquisition circuit to select at least one of the plurality of different pairings to monitor based on at least one of the quality of the respective signal, a phase difference between the respective signal and that of other pairings, a position of electrodes relative to the patient's body, and other criteria.